of_class

auto eve::of_class = functor<of_class_t>

inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   // Regular overload
   template<std::uint8_t I, eve::floating_value T>
   constexpr auto of_class(value auto x, fp_class<I> i) noexcept;
}

Parameters

• x: value.
• i: combination of floating point classes to check

Return value

the elementwise logical result of the classification.

Note

The iparameter can be constructed easily by using the values qnan, poszero, negzero, posinf,neginf, denorn,neg, snan defined in the namespace eve and the | operator (see the example below).

name	meaning
qnan	quiet NaN
poszero	positive zero
negzero	negative zero
posinf	positive infinite
neginf	negative infinite
denorm	denormal number
neg	negative finite
snan	signaling NaN

Actually snan and qnan are not distinguished in simd wide.

External references

• Wikipedia; Subnormal numbers

Example

// revision 0
#include <eve/module/core.hpp>
#include <iostream>
 
int main()
{
  auto inf  = eve::inf(eve::as<double>());
  auto mind = eve::mindenormal(eve::as<double>());
  auto nan  = eve::nan(eve::as<double>());
 
  eve::wide wf0{0.0, 1.0, -2.0, nan, inf, mind, inf, -0.0};
 
  std::cout << "<- wf0                         = " << wf0 << "\n";
 
  std::cout << "-> of_class(wf0, eve::qnan   )                = " << eve::of_class(wf0, eve::qnan   ) << "\n";
  std::cout << "-> of_class(wf0, eve::poszero)                = " << eve::of_class(wf0, eve::poszero) << "\n";
  std::cout << "-> of_class(wf0, eve::negzero)                = " << eve::of_class(wf0, eve::negzero) << "\n";
  std::cout << "-> of_class(wf0, eve::posinf )                = " << eve::of_class(wf0, eve::posinf ) << "\n";
  std::cout << "-> of_class(wf0, eve::neginf )                = " << eve::of_class(wf0, eve::neginf ) << "\n";
  std::cout << "-> of_class(wf0, eve::denorm )                = " << eve::of_class(wf0, eve::denorm ) << "\n";
  std::cout << "-> of_class(wf0, eve::neg    )                = " << eve::of_class(wf0, eve::neg    ) << "\n";
  std::cout << "-> of_class(wf0, eve::snan   )                = " << eve::of_class(wf0, eve::snan   ) << "\n";
  std::cout << "-> of_class(wf0, eve::poszero|eve::negzero|eve::posinf) = " << eve::of_class(wf0, eve::poszero|eve::negzero|eve::posinf) << "\n";
 
}