exponent

eve::exponent = functor<exponent_t>

inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   // Regular overload
   constexpr auto exponent(floating_value auto x)       noexcept; // 1
 
   // Semantic options
   constexpr auto exponent[raw](floating_value auto x)  noexcept; // 2
}

Parameters

• x : argument.

Return value

1. The value of the IEEE exponent is returned. In particular:
   • inf, minf and nan return maxexponent plus 1
   • zero returns zero 2 identical except that results for zero, nan and infinite inputs are unspecified

Note

The exponent $e$ and mantissa $m$ of a floating point entry $x$ are related by $x = m\times 2^e$, with $|m| \in \{0\} \cup [1, 2[$.

Example

// revision 0
#include <eve/module/core.hpp>
#include <iostream>
 
int main()
{
  eve::wide wf0{0.0, 1.0, 2.0, 3.0, -1.0, -2.0, -3.0, -4.0};
 
  std::cout << "<- wf0                = " << wf0 << "\n";
                                      
  std::cout << "-> exponent(wf0)      = " << eve::exponent(wf0) << "\n";
  std::cout << "-> exponent[raw](wf0) = " << eve::exponent[eve::raw](wf0) << "\n";
}