is_nan

kyosu::is_nan = eve::functor<is_nan_t>

inlineconstexpr

test the parameter for nan

Header file

#include <kyosu/functions.hpp>

Callable Signatures

namespace kyosu
{
   template<kyosu::concepts::cayley_dickson T> constexpr auto is_nan(T z) noexcept;
   template<eve::floating_ordered_value T>     constexpr auto is_nan(T z) noexcept;
}

Parameters

• z: Value to process.

Return value

Returns elementwise true is any component of the element is nan .

Example

#include <kyosu/kyosu.hpp>
#include <eve/wide.hpp>
#include <iostream>
 
int main()
{
  using kyosu::is_nan;
  using kyosu::complex_t;
  using kyosu::quaternion_t;
  using eve::as;
  using e_t = float;
  using c_t = kyosu::complex_t<float>;
  using q_t = kyosu::quaternion_t<float>;
  using we_t = eve::wide<e_t, eve::fixed<4>>;
  using wc_t = eve::wide<c_t, eve::fixed<4>>;
  using wq_t = eve::wide<q_t, eve::fixed<4>>;
 
  std::cout << "Real:        \n";
  e_t e(2.9f);
  e_t nan = eve::nan(as(e));
  e_t inf = eve::inf(as(e));
  e_t zer = eve::zero(as(e));
  we_t we = we_t(e, zer, nan, inf);
  std::cout << e << " -> " << is_nan(e) << "\n";
  std::cout << we << " -> " << is_nan(we) << "\n";
  std::cout               << is_nan(c_t(e))<< "\n";
  std::cout               << is_nan(q_t(e))<< "\n";
  std::cout               << is_nan(kyosu::complex(we))<< "\n";
  std::cout               << is_nan(kyosu::quaternion(we))<< "\n";
 
  std::cout << "Complex:     \n";
  c_t c(3.5f,-2.9f);
  c_t d(0.0f, inf);
  wc_t wc = wc_t(c, zer, nan, d);
  std::cout << c << " -> " << is_nan(c) << "\n";
  std::cout << wc << " -> " << is_nan(wc) << "\n";
  std::cout                 << is_nan(kyosu::complex(wc))<< "\n";;
  std::cout                 << is_nan(kyosu::quaternion(wc))<< "\n";
 
  std::cout << "Quaternion:  \n";
  q_t q(3.5f,-2.9f, 2.1f, 3.2f);
  q_t r(3.5f, nan, inf, zer);
  wq_t wq = wq_t(q, zer, nan, r);
  std::cout << q << " -> " << is_nan(q) << "\n";
  std::cout << wq << " -> " << is_nan(wq) << "\n";
 
  return 0;
}