lpart

kyosu::lpart = extractor<4>{}

inlineconstexpr

Extracts the \(l\) part of a value.

Header file

#include <kyosu/functions.hpp>

Callable Signatures

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

Parameters

• v: Original value.

Return value

1. Returns a properly const-qualified reference to the \(l\) part of v.
2. Returns T{0}.

Example

#include <kyosu/kyosu.hpp>
#include <eve/wide.hpp>
#include <iostream>
 
int main()
{
  using kyosu::lpart;
  using kyosu::complex_t;
  using kyosu::quaternion_t;
 
  std::cout << "Real:        ";
  float f = 72.9f;
  std::cout << f << " -> " << lpart(f) << "\n";
 
  std::cout << "Complex:     ";
  auto z = kyosu::complex_t<float>(3.5f,-2.9f);
  std::cout << z << " -> " << lpart(z) << "\n";
 
  std::cout << "Quaternion:  ";
  auto q = kyosu::quaternion_t<double>(1.,2.,3.,4.);
  std::cout << q << " -> " << lpart(q)  <<  " => ";
 
  std::cout << "octonion:  ";
  auto o = kyosu::octonion_t<double>(1.,2.,3.,4.,11.,12.,13.,14.);
  std::cout << o << " -> " << lpart(o)  <<  " => ";
 
 
  return 0;
}