frexp

eve::frexp = functor<frexp_t>

inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   // Regular overload
   constexpr auto frexp(floating_value auto x)                          noexcept; // 1
 
   // Lanes masking
   constexpr auto frexp[conditional_expr auto c](floating_value auto x) noexcept; // 2
   constexpr auto frexp[logical_value auto m](floating_value auto x)    noexcept; // 2
 
   // Semantic options
   constexpr auto frexp[pedantic](floating_value x)                     noexcept; // 3
}

Parameters

• x: value.
• c: Conditional expression masking the operation.
• m: Logical value masking the operation.

Return value

1. returns a kumi::tuple {m,e} of values of the same type asx`, which are related by \(x = m\times 2^e\), with \(|m| \in [0.5, 1.5[\). However, the cases \(x = \pm\infty\) or is a Nan or a denormal are undefined.
2. The operation is performed conditionnaly.
3. this option takes also properly care of the cases where \(x = \pm0, \pm\infty\) or is a Nan, where \(m=x\) and \(e=0\) and of the denormal cases.

External references

• C++ standard reference

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 << "-> frexp(wf0)           = " << eve::frexp(wf0) << "\n";
  std::cout << "-> frexp[pedantic](wf0) = " << eve::frexp[eve::pedantic](wf0) << "\n";
}