exp

auto eve::exp = functor<exp_t>

inlineconstexpr

Header file

#include <eve/module/math.hpp>

Callable Signatures

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

Parameters

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

Return value

1. Returns the elementwise natural exponential of the input. In particular:
   • If the element is \(\pm0\), \(1\) is returned
   • If the element is \(-\infty\), \(+0\) is returned
   • If the element is \(\infty\), \(\infty\) is returned
   • If the element is a NaN, NaN is returned
2. The operation is performed conditionnaly.

External references

• C++ standard reference
• Wolfram MathWorld
• DLMF
• Wikipedia

Example

// revision 1
#include <eve/module/math.hpp>
#include <iostream>
 
int main()
{
  eve::wide wf = {0.0f, -0.0f, -1.0f, 1.0f, 2.0f,
                  eve::inf(eve::as<float>()), eve::minf(eve::as<float>()), eve::nan(eve::as<float>())};
 
  std::cout << "<- wf                     = " << wf << "\n";
 
  std::cout << "-> exp(wf)                = " << eve::exp(wf) << "\n";
  std::cout << "-> exp[ignore_last(2)](wf)= " << eve::exp[eve::ignore_last(2)](wf) << "\n";
  std::cout << "-> exp[wf != 2.0f](wf)    = " << eve::exp[wf != 2.0f](wf) << "\n";
}