real

kyosu::real = extractor<0>{}

inlineconstexpr

Extracts the real part of a value.

Header file

#include <kyosu/functions.hpp>

Callable Signatures

namespace kyosu
{
  constexpr decltype(auto) real(concepts::cayley_dickson auto&& v)  noexcept; // 1
  constexpr decltype(auto) real(concepts::real auto&& v)            noexcept; // 2
}

Parameters

• v: Value to process.

Return value

1. Returns a properly const-qualified reference to the real part of v.
2. Returns a properly const-qualified reference to v.

Example

#include <kyosu/kyosu.hpp>
#include <eve/wide.hpp>
#include <iostream>
 
int main()
{
  using kyosu::real;
  using kyosu::complex_t;
  using kyosu::quaternion_t;
 
  std::cout << "Real:        ";
  float f = 72.9f;
  std::cout << f << " -> " << real(f) << " => ";
  real(f) = -9.f;
  std::cout << f << "\n";
 
  std::cout << "Complex:     ";
  auto z = kyosu::complex_t<float>(3.5f,-2.9f);
  std::cout << z << " -> " << real(z) <<  " => ";
  real(z) = 11.23f;
  std::cout << z << "\n";
 
  std::cout << "Quaternion:  ";
  auto q = kyosu::quaternion_t<double>(1.,2.,3.,4.);
  std::cout << q << " -> " << real(q)  <<  " => ";
  real(q) = 42.7;
  std::cout << q << "\n";
 
  std::cout << "SIMD:        ";
  eve::wide<kyosu::complex_t<double>, eve::fixed<2>> wz(kyosu::complex_t<double>(1.3,-3.7));
  std::cout << wz << " -> " << real(wz) <<   " => ";
  real(wz) = eve::wide<double, eve::fixed<2>>{13.37,63.24};
  std::cout << wz << "\n";
 
  return 0;
}