E.V.E
v2023.02.15

◆ is_less

eve::is_less = {}
inlineconstexpr

Returns a logical true if and only if the element value of the first parameter is less than the second one.

Defined in Header

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
template< eve::value T, eve::value U >
eve::as_logical<T> is_less(T x,U y) noexcept;
}
constexpr callable_is_less_ is_less
Returns a logical true if and only if the element value of the first parameter is less than the secon...
Definition: is_less.hpp:81
Definition: abi.hpp:18

Parameters

Return value

The call eve::is_less(x,y) is semantically equivalent to x < y:

Example

#include <eve/module/core.hpp>
#include <eve/wide.hpp>
#include <iostream>
int main()
{
wide_ft pf = {0.0f, 1.0f, -1.0f, -2.0f};
wide_ft qf = {1.0f, -1.0f, 0.0f, -2.0f};
std::cout << "---- simd" << '\n'
<< "<- pf = " << pf << '\n'
<< "<- qf = " << qf << '\n'
<< "-> is_less(pf, qf) = " << eve::is_less(pf, qf) << '\n';
float xf = 1.0f;
float yf = 2.0f;
std::cout << "---- scalar" << '\n'
<< "<- xf = " << xf << '\n'
<< "<- yf = " << yf << '\n'
<< "-> is_less(xf, yf) = " << eve::is_less(xf, yf) << '\n';
return 0;
}
Wrapper for SIMD registers.
Definition: wide.hpp:65

Semantic Modifiers

  • Masked Call

    The call eve;is_less[mask](x,y) provides a masked version of eve::is_less which is equivalent to if_else (mask, is_less(x), eve::false( eve::as(x,y))).

    Example

    #include <eve/module/core.hpp>
    #include <eve/wide.hpp>
    #include <iostream>
    int main()
    {
    wide_ft pf = {0.0f, 1.0f, -1.0f, 2.0f};
    wide_ft qf = {1.0f, -1.0f, 0.0f, 3.0f};
    std::cout << "---- simd" << '\n'
    << "<- pf = " << pf << '\n'
    << "<- qf = " << qf << '\n'
    << "-> is_less[pf > 0](pf, qf) = " << eve::is_less[pf > 0](pf, qf) << '\n';
    return 0;
    }
  • definitely

    The expression definitely(is_less)(x, y, t) where x and y must be floating point values, evals to true if and only if x is definitely less than y. This means that:

    • if t is a floating_value then \(x < y - t \max(|x|, |y|)\)
    • if t is a positive integral_value then \(x < \mbox{prev}(y, t)\);
    • if t is omitted then the tolerance t default to 3*eps(as(x)).

    Example

    #include <eve/module/core.hpp>
    #include <eve/wide.hpp>
    #include <iostream>
    int main()
    {
    wide_ft pf = {0.0f, 1.0f, -1.0f, 2.0f};
    wide_ft qf = {1.0f, -1.0f, 0.0f, 3.0f};
    std::cout << "---- simd" << '\n'
    << "<- pf = " << pf << '\n'
    << "<- qf = " << qf << '\n'
    << "-> definitely(is_less)(pf, qf) = " << eve::definitely(eve::is_less)(pf, qf) << '\n';
    return 0;
    }
    constexpr definitely_type const definitely
    Higher-order Callable Object imbuing a tolerant to small errors semantic onto other Callable Objects.
    Definition: fuzzy.hpp:104