ilogb

eve::ilogb = functor<ilogb_t>

inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   // Regular overload
   template < floating_value T> constexpr as_integer_t<T> ilogb(T x)  noexcept;

Parameters

• x : argument.

Return value

The spirit of the value of the std::ilogb is returned. In particular:

• zero and nan return valmin(as<as_integer_t<T>>()).
• inf and minfreturn valmax(as<as_integer_t<T>>()).

Example

// revision 1
#include <eve/module/math.hpp>
#include <iostream>
 
int main()
{
  eve::wide wd = {0.0, -1.0, 8.0, 1.5, 2.0, 16.0, 15.3, 17.2};
 
  std::cout << "<- wd                      = " << wd << "\n";
 
  std::cout << "-> ilogb(wd)                = " << eve::ilogb(wd) << "\n";
  std::cout << "-> ilogb[ignore_last(2)](wd)= " << eve::ilogb[eve::ignore_last(2)](wd) << "\n";
  std::cout << "-> ilogb[wd != 2.0](wd)     = " << eve::ilogb[wd != 2.0](wd) << "\n";
}