CMake Warning:
  Manually-specified variables were not used by the project:

    CMAKE_EXPORT_NO_PACKAGE_REGISTRY
    CONAN_COMPILER
    CONAN_COMPILER_VERSION
    CONAN_CXX_FLAGS
    CONAN_C_FLAGS
    CONAN_EXPORTED
    CONAN_IN_LOCAL_CACHE
    CONAN_LIBCXX
    CONAN_SHARED_LINKER_FLAGS


In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:9:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/concepts/encoding_traits.hpp:101:16: error: template declaration of 'constexpr const auto mgs::base_n::is_encoding_traits_v'
 constexpr auto is_encoding_traits_v = is_encoding_traits<T>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/convertible_to.hpp:6:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:8,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/complete_type.hpp:42:16: error: template declaration of 'constexpr const auto mgs::meta::is_complete_type_v'
 constexpr auto is_complete_type_v = is_complete_type<T>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:8:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/convertible_to.hpp:96:16: error: template declaration of 'constexpr const auto mgs::meta::is_convertible_to_v'
 constexpr auto is_convertible_to_v = is_convertible_to<From, To>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/default_constructible.hpp:6:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:9,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/constructible_from.hpp:57:16: error: template declaration of 'constexpr const auto mgs::meta::is_constructible_from_v'
 constexpr auto is_constructible_from_v = is_constructible_from<T, Args...>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/default_constructible.hpp:8:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:9,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/move_constructible.hpp:31:16: error: template declaration of 'constexpr const auto mgs::meta::is_move_constructible_v'
 constexpr auto is_move_constructible_v = is_move_constructible<T>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:9:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/default_constructible.hpp:29:16: error: template declaration of 'constexpr const auto mgs::meta::is_default_constructible_v'
 constexpr auto is_default_constructible_v = is_default_constructible<T>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/assignable_from.hpp:7:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/movable.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:10,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/common_reference_with.hpp:74:16: error: template declaration of 'constexpr const auto mgs::meta::has_common_reference_v'
 constexpr auto has_common_reference_v = has_common_reference_with<T, U>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/movable.hpp:7:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:10,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/assignable_from.hpp:59:16: error: template declaration of 'constexpr const auto mgs::meta::is_assignable_from_v'
 constexpr auto is_assignable_from_v = std::is_assignable<LHS, RHS>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/movable.hpp:9:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:10,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/swappable.hpp:56:16: error: template declaration of 'constexpr const auto mgs::meta::is_swappable_v'
 constexpr auto is_swappable_v = is_swappable<T>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:10:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/movable.hpp:37:16: error: template declaration of 'constexpr const auto mgs::meta::is_movable_v'
 constexpr auto is_movable_v = is_movable<T>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/input_or_output_iterator.hpp:8:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/output_iterator.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:11,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/dereferenceable.hpp:57:16: error: template declaration of 'constexpr const auto mgs::meta::is_dereferenceable_v'
 constexpr auto is_dereferenceable_v = is_dereferenceable<T>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/copyable.hpp:8:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/semiregular.hpp:6,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/weakly_incrementable.hpp:8,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/input_or_output_iterator.hpp:10,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/output_iterator.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:11,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/copy_constructible.hpp:46:16: error: template declaration of 'constexpr const auto mgs::meta::is_copy_constructible_v'
 constexpr auto is_copy_constructible_v = is_copy_constructible<T>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/semiregular.hpp:6:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/weakly_incrementable.hpp:8,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/input_or_output_iterator.hpp:10,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/output_iterator.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:11,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/copyable.hpp:38:16: error: template declaration of 'constexpr const auto mgs::meta::is_copyable_v'
 constexpr auto is_copyable_v = is_copyable<T>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/weakly_incrementable.hpp:8:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/input_or_output_iterator.hpp:10,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/output_iterator.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:11,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/semiregular.hpp:29:16: error: template declaration of 'constexpr const auto mgs::meta::is_semiregular_v'
 constexpr auto is_semiregular_v = is_semiregular<T>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/signed_integral.hpp:6:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/weakly_incrementable.hpp:9,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/input_or_output_iterator.hpp:10,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/output_iterator.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:11,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/integral.hpp:25:16: error: template declaration of 'constexpr const auto mgs::meta::is_integral_v'
 constexpr auto is_integral_v = is_integral<T>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/weakly_incrementable.hpp:9:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/input_or_output_iterator.hpp:10,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/output_iterator.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:11,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/signed_integral.hpp:28:16: error: template declaration of 'constexpr const auto mgs::meta::is_signed_integral_v'
 constexpr auto is_signed_integral_v = is_signed_integral<T>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/iter_difference_t.hpp:3:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/weakly_incrementable.hpp:13,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/input_or_output_iterator.hpp:10,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/output_iterator.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:11,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/detail/iterator_traits.hpp:130:16: error: template declaration of 'constexpr const auto mgs::detail::is_iterator_traits_v'
 constexpr auto is_iterator_traits_v = is_iterator_traits<T>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/input_or_output_iterator.hpp:10:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/output_iterator.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:11,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/weakly_incrementable.hpp:85:16: error: template declaration of 'constexpr const auto mgs::meta::is_weakly_incrementable_v'
 constexpr auto is_weakly_incrementable_v = is_weakly_incrementable<T>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/output_iterator.hpp:7:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:11,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/input_or_output_iterator.hpp:36:16: error: template declaration of 'constexpr const auto mgs::meta::is_input_or_output_iterator_v'
 constexpr auto is_input_or_output_iterator_v =
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/output_iterator.hpp:8:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:11,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/writable.hpp:82:16: error: template declaration of 'constexpr const auto mgs::meta::is_writable_v'
 constexpr auto is_writable_v = is_writable<Out, T>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:11:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/output_iterator.hpp:44:16: error: template declaration of 'constexpr const auto mgs::meta::is_output_iterator_v'
 constexpr auto is_output_iterator_v = is_output_iterator<I, T>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:12:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/same_as.hpp:25:16: error: template declaration of 'constexpr const auto mgs::meta::is_same_as_v'
 constexpr auto is_same_as_v = is_same_as<T, U>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:20:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/input_source.hpp:64:16: error: template declaration of 'constexpr const auto mgs::codecs::is_input_source_v'
 constexpr auto is_input_source_v = is_input_source<T, O>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:21:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/sized_input_source.hpp:50:16: error: template declaration of 'constexpr const auto mgs::codecs::is_sized_input_source_v'
 constexpr auto is_sized_input_source_v = is_sized_input_source<T, O>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/weakly_equality_comparable_with.hpp:7:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/equality_comparable.hpp:6,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/regular.hpp:6,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/derived_from.hpp:9,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/input_iterator.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:23,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/boolean.hpp:146:16: error: template declaration of 'constexpr const auto mgs::meta::is_boolean_v'
 constexpr auto is_boolean_v = is_boolean<T>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/equality_comparable.hpp:6:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/regular.hpp:6,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/derived_from.hpp:9,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/input_iterator.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:23,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/weakly_equality_comparable_with.hpp:72:16: error: template declaration of 'constexpr const auto mgs::meta::is_weakly_equality_comparable_with_v'
 constexpr auto is_weakly_equality_comparable_with_v =
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/regular.hpp:6:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/derived_from.hpp:9,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/input_iterator.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:23,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/equality_comparable.hpp:26:16: error: template declaration of 'constexpr const auto mgs::meta::is_equality_comparable_v'
 constexpr auto is_equality_comparable_v = is_equality_comparable<T>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/derived_from.hpp:9:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/input_iterator.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:23,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/regular.hpp:29:16: error: template declaration of 'constexpr const auto mgs::meta::is_regular_v'
 constexpr auto is_regular_v = is_regular<T>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/input_iterator.hpp:7:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:23,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/derived_from.hpp:49:16: error: template declaration of 'constexpr const auto mgs::meta::is_derived_from_v'
 constexpr auto is_derived_from_v = is_derived_from<Derived, Base>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/input_iterator.hpp:9:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:23,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/readable.hpp:84:16: error: template declaration of 'constexpr const auto mgs::meta::is_readable_v'
 constexpr auto is_readable_v = is_readable<T>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:23:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/input_iterator.hpp:46:16: error: template declaration of 'constexpr const auto mgs::meta::is_input_iterator_v'
 constexpr auto is_input_iterator_v = is_input_iterator<T>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:24:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/sentinel_for.hpp:36:16: error: template declaration of 'constexpr const auto mgs::meta::is_sentinel_for_v'
 constexpr auto is_sentinel_for_v = is_sentinel_for<T, Iterator>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/decode_algorithm.hpp:25:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/sized_sentinel_for.hpp:62:16: error: template declaration of 'constexpr const auto mgs::meta::is_sized_sentinel_for_v'
 constexpr auto is_sized_sentinel_for_v =
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/input_range.hpp:6:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/iterator_sentinel_source.hpp:9,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/encode_algorithm.hpp:24,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:8,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/range.hpp:68:16: error: template declaration of 'constexpr const auto mgs::meta::is_range_v'
 constexpr auto is_range_v = is_range<T>::value;
                ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/range.hpp:70:51: error: 'is_range_v' was not declared in this scope
 template <typename T, typename = std::enable_if_t<is_range_v<T>>>
                                                   ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/range.hpp:70:62: error: template argument 1 is invalid
 template <typename T, typename = std::enable_if_t<is_range_v<T>>>
                                                              ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/range.hpp:70:65: error: expected unqualified-id before '>' token
 template <typename T, typename = std::enable_if_t<is_range_v<T>>>
                                                                 ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/iterator_sentinel_source.hpp:9:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/encode_algorithm.hpp:24,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:8,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/input_range.hpp:34:16: error: template declaration of 'constexpr const auto mgs::meta::is_input_range_v'
 constexpr auto is_input_range_v = is_input_range<T>::value;
                ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/input_range.hpp:36:51: error: 'is_input_range_v' was not declared in this scope
 template <typename T, typename = std::enable_if_t<is_input_range_v<T>>>
                                                   ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/input_range.hpp:36:68: error: template argument 1 is invalid
 template <typename T, typename = std::enable_if_t<is_input_range_v<T>>>
                                                                    ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/input_range.hpp:36:71: error: expected unqualified-id before '>' token
 template <typename T, typename = std::enable_if_t<is_input_range_v<T>>>
                                                                       ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/encode_algorithm.hpp:24:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:8,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/iterator_sentinel_source.hpp:69:42: error: template declaration of 'auto mgs::codecs::make_iterator_sentinel_source'
 auto make_iterator_sentinel_source(meta::input_range<R>& rng)
                                          ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/iterator_sentinel_source.hpp:69:36: error: 'input_range' is not a member of 'mgs::meta'
 auto make_iterator_sentinel_source(meta::input_range<R>& rng)
                                    ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/iterator_sentinel_source.hpp:69:55: error: expected primary-expression before '>' token
 auto make_iterator_sentinel_source(meta::input_range<R>& rng)
                                                       ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/iterator_sentinel_source.hpp:69:58: error: 'rng' was not declared in this scope
 auto make_iterator_sentinel_source(meta::input_range<R>& rng)
                                                          ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/iterator_sentinel_source.hpp:79:42: error: template declaration of 'auto mgs::codecs::make_iterator_sentinel_source'
 auto make_iterator_sentinel_source(meta::input_range<R const> & rng)
                                          ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/iterator_sentinel_source.hpp:79:36: error: 'input_range' is not a member of 'mgs::meta'
 auto make_iterator_sentinel_source(meta::input_range<R const> & rng)
                                    ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/iterator_sentinel_source.hpp:79:56: error: expected primary-expression before 'const'
 auto make_iterator_sentinel_source(meta::input_range<R const> & rng)
                                                        ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:9:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/byte_type.hpp:43:16: error: template declaration of 'constexpr const auto mgs::codecs::is_byte_type_v'
 constexpr auto is_byte_type_v = is_byte_type<T>::value;
                ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/byte_type.hpp:45:51: error: 'is_byte_type_v' was not declared in this scope
 template <typename T, typename = std::enable_if_t<is_byte_type_v<T>>>
                                                   ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/byte_type.hpp:45:66: error: template argument 1 is invalid
 template <typename T, typename = std::enable_if_t<is_byte_type_v<T>>>
                                                                  ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/byte_type.hpp:45:69: error: expected unqualified-id before '>' token
 template <typename T, typename = std::enable_if_t<is_byte_type_v<T>>>
                                                                     ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:3:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:26:32: error: 'byte_type' in namespace 'mgs::codecs' does not name a template type
             typename = codecs::byte_type<
                                ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:26:41: error: expected '>' before '<' token
             typename = codecs::byte_type<
                                         ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:35:32: error: 'byte_type' in namespace 'mgs::codecs' does not name a template type
             typename = codecs::byte_type<
                                ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec_traits.hpp:35:41: error: expected '>' before '<' token
             typename = codecs::byte_type<
                                         ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:7:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:8,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/concepts/codec_traits.hpp:77:16: error: template declaration of 'constexpr const auto mgs::codecs::is_codec_traits_v'
 constexpr auto is_codec_traits_v = is_codec_traits<T, IS1, IS2>::value;
                ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/detail/default_converter.hpp:22:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/output_traits.hpp:7,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:12,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:8,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/output_range.hpp:34:16: error: template declaration of 'constexpr const auto mgs::meta::is_output_range_v'
 constexpr auto is_output_range_v = is_output_range<R, T>::value;
                ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/output_range.hpp:38:39: error: 'is_output_range_v' was not declared in this scope
           typename = std::enable_if_t<is_output_range_v<R, T>>>
                                       ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/output_range.hpp:38:60: error: template argument 1 is invalid
           typename = std::enable_if_t<is_output_range_v<R, T>>>
                                                            ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/meta/concepts/output_range.hpp:38:63: error: expected unqualified-id before '>' token
           typename = std::enable_if_t<is_output_range_v<R, T>>>
                                                               ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/output_traits.hpp:7:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:12,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:8,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/detail/default_converter.hpp:98:32: error: 'output_range' in namespace 'mgs::meta' does not name a template type
             typename R = meta::output_range<Output, typename T::element_type>,
                                ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/detail/default_converter.hpp:98:44: error: expected '>' before '<' token
             typename R = meta::output_range<Output, typename T::element_type>,
                                            ^
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:8:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:55:39: error: 'mgs::meta::input_range' has not been declared
   static auto make_encoder_impl(meta::input_range<InputRange>& r,
                                       ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:55:50: error: expected ',' or '...' before '<' token
   static auto make_encoder_impl(meta::input_range<InputRange>& r,
                                                  ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:57:70: error: 'r' was not declared in this scope
       -> decltype(traits::make_encoder(make_iterator_sentinel_source(r)))
                                                                      ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:57:70: error: 'r' was not declared in this scope
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:63:39: error: 'mgs::meta::input_range' has not been declared
   static auto make_encoder_impl(meta::input_range<InputRange> const& r,
                                       ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:63:50: error: expected ',' or '...' before '<' token
   static auto make_encoder_impl(meta::input_range<InputRange> const& r,
                                                  ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:65:70: error: 'r' was not declared in this scope
       -> decltype(traits::make_encoder(make_iterator_sentinel_source(r)))
                                                                      ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:65:70: error: 'r' was not declared in this scope
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:63:15: error: 'template<class CodecTraits> template<class InputRange> static decltype (mgs::codecs::basic_codec<CodecTraits>::traits:: make_encoder(<expression error>)) mgs::codecs::basic_codec<CodecTraits>::make_encoder_impl(int)' cannot be overloaded
   static auto make_encoder_impl(meta::input_range<InputRange> const& r,
               ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:55:15: error: with 'template<class CodecTraits> template<class InputRange> static decltype (mgs::codecs::basic_codec<CodecTraits>::traits:: make_encoder(<expression error>)) mgs::codecs::basic_codec<CodecTraits>::make_encoder_impl(int)'
   static auto make_encoder_impl(meta::input_range<InputRange>& r,
               ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:90:39: error: 'mgs::meta::input_range' has not been declared
   static auto make_decoder_impl(meta::input_range<InputRange>& r,
                                       ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:90:50: error: expected ',' or '...' before '<' token
   static auto make_decoder_impl(meta::input_range<InputRange>& r,
                                                  ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:92:70: error: 'r' was not declared in this scope
       -> decltype(traits::make_decoder(make_iterator_sentinel_source(r)))
                                                                      ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:92:70: error: 'r' was not declared in this scope
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:98:39: error: 'mgs::meta::input_range' has not been declared
   static auto make_decoder_impl(meta::input_range<InputRange> const& r,
                                       ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:98:50: error: expected ',' or '...' before '<' token
   static auto make_decoder_impl(meta::input_range<InputRange> const& r,
                                                  ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:100:70: error: 'r' was not declared in this scope
       -> decltype(traits::make_decoder(make_iterator_sentinel_source(r)))
                                                                      ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:100:70: error: 'r' was not declared in this scope
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:98:15: error: 'template<class CodecTraits> template<class InputRange> static decltype (mgs::codecs::basic_codec<CodecTraits>::traits:: make_decoder(<expression error>)) mgs::codecs::basic_codec<CodecTraits>::make_decoder_impl(int)' cannot be overloaded
   static auto make_decoder_impl(meta::input_range<InputRange> const& r,
               ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:90:15: error: with 'template<class CodecTraits> template<class InputRange> static decltype (mgs::codecs::basic_codec<CodecTraits>::traits:: make_decoder(<expression error>)) mgs::codecs::basic_codec<CodecTraits>::make_decoder_impl(int)'
   static auto make_decoder_impl(meta::input_range<InputRange>& r,
               ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp: In static member function 'static decltype (mgs::codecs::basic_codec<CodecTraits>::traits:: make_encoder(<expression error>)) mgs::codecs::basic_codec<CodecTraits>::make_encoder_impl(int)':
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:59:63: error: 'r' was not declared in this scope
     return traits::make_encoder(make_iterator_sentinel_source(r));
                                                               ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp: In static member function 'static decltype (mgs::codecs::basic_codec<CodecTraits>::traits:: make_encoder(<expression error>)) mgs::codecs::basic_codec<CodecTraits>::make_encoder_impl(int)':
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:67:63: error: 'r' was not declared in this scope
     return traits::make_encoder(make_iterator_sentinel_source(r));
                                                               ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp: In static member function 'static decltype (mgs::codecs::basic_codec<CodecTraits>::traits:: make_decoder(<expression error>)) mgs::codecs::basic_codec<CodecTraits>::make_decoder_impl(int)':
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:94:63: error: 'r' was not declared in this scope
     return traits::make_decoder(make_iterator_sentinel_source(r));
                                                               ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp: In static member function 'static decltype (mgs::codecs::basic_codec<CodecTraits>::traits:: make_decoder(<expression error>)) mgs::codecs::basic_codec<CodecTraits>::make_decoder_impl(int)':
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:102:63: error: 'r' was not declared in this scope
     return traits::make_decoder(make_iterator_sentinel_source(r));
                                                               ^
/home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp: In function 'int main()':
/home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:6:51: error: no matching function for call to 'mgs::base_n::basic_codec<mgs::detail::base64_encoding_traits<> >::encode(const char [14])'
   std::cout << mgs::base64::encode("Hello, World!") << std::endl;
                                                   ^
/home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:6:51: note: candidate is:
In file included from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base_n/basic_codec.hpp:8:0,
                 from /home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/base64.hpp:8,
                 from /home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:3:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:125:15: note: template<class T, class ... Args> static mgs::codecs::codec_output<decltype (mgs::codecs::output_traits<T>::create(make_encoder((forward<Args>)(mgs::codecs::basic_codec::encode::args)...))), decltype (make_encoder((forward<Args>)(mgs::codecs::basic_codec::encode::args)...))> mgs::codecs::basic_codec<CodecTraits>::encode(Args&& ...) [with T = T; Args = {Args ...}; CodecTraits = mgs::base_n::basic_codec_traits<mgs::detail::base64_encoding_traits<>, mgs::detail::base64_encoding_traits<> >]
   static auto encode(Args&&... args) -> codecs::codec_output<
               ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:125:15: note:   template argument deduction/substitution failed:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp: In substitution of 'template<class T, class ... Args> static mgs::codecs::codec_output<decltype (mgs::codecs::output_traits<T>::create(make_encoder((forward<Args>)(mgs::codecs::basic_codec::encode::args)...))), decltype (make_encoder((forward<Args>)(mgs::codecs::basic_codec::encode::args)...))> mgs::codecs::basic_codec<CodecTraits>::encode(Args&& ...) [with T = std::basic_string<char>; Args = {const char (&)[14]}]':
/home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:6:51:   required from here
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:127:76: error: no matching function for call to 'mgs::codecs::basic_codec<mgs::base_n::basic_codec_traits<mgs::detail::base64_encoding_traits<>, mgs::detail::base64_encoding_traits<> > >::make_encoder(const char [14])'
           output_traits<T>::create(make_encoder(std::forward<Args>(args)...))),
                                                                            ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:127:76: note: candidate is:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:107:15: note: template<class ... Args> static decltype (make_encoder_impl((forward<Args>)(mgs::codecs::basic_codec::make_encoder::args)..., mgs::meta::priority_tag<4ul>{})) mgs::codecs::basic_codec<CodecTraits>::make_encoder(Args&& ...) [with Args = {Args ...}; CodecTraits = mgs::base_n::basic_codec_traits<mgs::detail::base64_encoding_traits<>, mgs::detail::base64_encoding_traits<> >]
   static auto make_encoder(Args&&... args)
               ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:107:15: note:   template argument deduction/substitution failed:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp: In substitution of 'template<class ... Args> static decltype (make_encoder_impl((forward<Args>)(mgs::codecs::basic_codec::make_encoder::args)..., mgs::meta::priority_tag<4ul>{})) mgs::codecs::basic_codec<CodecTraits>::make_encoder(Args&& ...) [with Args = {const char (&)[14]}]':
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:127:76:   required by substitution of 'template<class T, class ... Args> static mgs::codecs::codec_output<decltype (mgs::codecs::output_traits<T>::create(make_encoder((forward<Args>)(mgs::codecs::basic_codec::encode::args)...))), decltype (make_encoder((forward<Args>)(mgs::codecs::basic_codec::encode::args)...))> mgs::codecs::basic_codec<CodecTraits>::encode(Args&& ...) [with T = std::basic_string<char>; Args = {const char (&)[14]}]'
/home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:6:51:   required from here
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:109:60: error: no matching function for call to 'mgs::codecs::basic_codec<mgs::base_n::basic_codec_traits<mgs::detail::base64_encoding_traits<>, mgs::detail::base64_encoding_traits<> > >::make_encoder_impl(const char [14], mgs::meta::priority_tag<4ul>)'
                                     meta::priority_tag<4>{}))
                                                            ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:109:60: note: candidates are:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:36:15: note: template<class IS> static decltype (mgs::codecs::basic_codec<CodecTraits>::traits:: make_encoder(std::move(is))) mgs::codecs::basic_codec<CodecTraits>::make_encoder_impl(mgs::codecs::input_source<IS>, mgs::meta::priority_tag<3ul>) [with IS = IS; CodecTraits = mgs::base_n::basic_codec_traits<mgs::detail::base64_encoding_traits<>, mgs::detail::base64_encoding_traits<> >]
   static auto make_encoder_impl(codecs::input_source<IS> is,
               ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:36:15: note:   template argument deduction/substitution failed:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp: In substitution of 'template<class IS> static decltype (mgs::codecs::basic_codec<CodecTraits>::traits:: make_encoder(std::move(is))) mgs::codecs::basic_codec<CodecTraits>::make_encoder_impl(mgs::codecs::input_source<IS>, mgs::meta::priority_tag<3ul>) [with IS = const char*]':
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:109:60:   required by substitution of 'template<class ... Args> static decltype (make_encoder_impl((forward<Args>)(mgs::codecs::basic_codec::make_encoder::args)..., mgs::meta::priority_tag<4ul>{})) mgs::codecs::basic_codec<CodecTraits>::make_encoder(Args&& ...) [with Args = {const char (&)[14]}]'
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:127:76:   required by substitution of 'template<class T, class ... Args> static mgs::codecs::codec_output<decltype (mgs::codecs::output_traits<T>::create(make_encoder((forward<Args>)(mgs::codecs::basic_codec::encode::args)...))), decltype (make_encoder((forward<Args>)(mgs::codecs::basic_codec::encode::args)...))> mgs::codecs::basic_codec<CodecTraits>::encode(Args&& ...) [with T = std::basic_string<char>; Args = {const char (&)[14]}]'
/home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:6:51:   required from here
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:36:58: error: no type named 'type' in 'struct std::enable_if<false, void>'
   static auto make_encoder_impl(codecs::input_source<IS> is,
                                                          ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp: In substitution of 'template<class ... Args> static decltype (make_encoder_impl((forward<Args>)(mgs::codecs::basic_codec::make_encoder::args)..., mgs::meta::priority_tag<4ul>{})) mgs::codecs::basic_codec<CodecTraits>::make_encoder(Args&& ...) [with Args = {const char (&)[14]}]':
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:127:76:   required by substitution of 'template<class T, class ... Args> static mgs::codecs::codec_output<decltype (mgs::codecs::output_traits<T>::create(make_encoder((forward<Args>)(mgs::codecs::basic_codec::encode::args)...))), decltype (make_encoder((forward<Args>)(mgs::codecs::basic_codec::encode::args)...))> mgs::codecs::basic_codec<CodecTraits>::encode(Args&& ...) [with T = std::basic_string<char>; Args = {const char (&)[14]}]'
/home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/example.cpp:6:51:   required from here
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:44:15: note: template<class I, class S> static decltype (mgs::codecs::basic_codec<CodecTraits>::traits:: make_encoder(declval<mgs::codecs::iterator_sentinel_source<I, S> >())) mgs::codecs::basic_codec<CodecTraits>::make_encoder_impl(mgs::meta::input_iterator<I>, mgs::meta::sentinel_for<S, I>, mgs::meta::priority_tag<2ul>) [with I = I; S = S; CodecTraits = mgs::base_n::basic_codec_traits<mgs::detail::base64_encoding_traits<>, mgs::detail::base64_encoding_traits<> >]
   static auto make_encoder_impl(meta::input_iterator<I> i,
               ^
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:44:15: note:   template argument deduction/substitution failed:
/home/conan/w/cci_PR-3828/.conan/data/mgs/0.1.2/_/_/package/5ab84d6acfe1f23c4fae0ab88f26e3a396351ac9/include/mgs/codecs/basic_codec.hpp:109:60: note:   candidate expects 3 arguments, 2 provided
                                     meta::priority_tag<4>{}))
                                                            ^
make[2]: *** [CMakeFiles/example.dir/example.cpp.o] Error 1
make[1]: *** [CMakeFiles/example.dir/all] Error 2
make: *** [all] Error 2
[HOOK - conan-center.py] pre_export(): WARN: [HEADER_ONLY, NO COPY SOURCE (KB-H005)] This recipe is a header only library as it does not declare 'settings'. Please include 'no_copy_source' to avoid unnecessary copy steps
mgs/0.1.2: WARN: This conanfile has no build step
ERROR: mgs/0.1.2 (test package): Error in build() method, line 13
	cmake.build()
	ConanException: Error 2 while executing cmake --build '/home/conan/w/cci_PR-3828/2/db0670c1-8ede-46d1-bbd6-e7ea4254cf19/recipes/mgs/all/test_package/build/dfae4d6ba682b8d9c5630c4c912db585c2a46c64' '--' '-j3'