none

eve::none = {}

inlineconstexpr

Computes a bool value which is true if and only if all elements of x are 0.

Defined in Header

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   template< eve::value T >
   bool none(T x) noexcept;   //1
 
   template< eve::top_bits M >
   bool none(M m) noexcept;   //2
}

• 1. A bool value which is true if and only if all elements of x are zero.
• 2 A bool value which is true if and only if all top bits elements of x are zero.

Parameters

• x : argument.
• m : argument.

Return value

A bool value.

Example

#include <eve/module/core.hpp>
#include <eve/wide.hpp>
#include <iostream>
 
using wide_ft = eve::wide<float, eve::fixed<4>>;
using wide_it = eve::wide<std::int16_t, eve::fixed<4>>;
 
int main()
{
  wide_ft pf = {-0.0f, 0.0f, -0.0f, -0.0f};
  wide_it qi = {-1, 0, 30, -32768};
 
  std::cout << "---- simd" << '\n'
            << "<- pf       = " << pf << '\n'
            << "-> none(pf != 0) = " << eve::none(pf != 0) << '\n'
            << "<- qi       = " << qi << '\n'
            << "-> none(qi != 0) = " << eve::none(qi != 0) << '\n';
 
  float        xf = -0.0f;
  float        yf = -3.0f;
 
  std::cout << "---- scalar" << '\n'
            << "<- xf       = " << xf << '\n'
            << "-> none(xf) = " << eve::none(xf != 0) << '\n'
            << "<- yf       = " << yf << '\n'
            << "-> none(yf) = " << eve::none(yf != 0) << '\n';
  return 0;
}

Semantic Modifiers

• Masked Call

  The call eve::none[mask](x) provides a masked version of none which is equivalent to : all not masked elements are zero.

  Example

  #include <eve/module/core.hpp>
  #include <eve/wide.hpp>
  #include <iostream>
   
  using wide_ft = eve::wide<float, eve::fixed<4>>;
  using wide_it = eve::wide<std::int16_t, eve::fixed<4>>;
   
  int main()
  {
    wide_it qi = {-3, 0, -30, -32768};
   
    std::cout << "---- simd" << '\n'
              << "<- qi                             = " << qi << '\n'
              << "-> none[ignore_first(1)](qi != 0) = " << eve::none[eve::ignore_first(1)](qi != 0) << '\n';
    return 0;
  }