sign_alternate

eve::sign_alternate = {}

inlineconstexpr

Computes \((-1)^n\).

Defined in Header

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   template< eve::signed_value T >
   T sign_alternate(T n) noexcept;
}

Parameters

• n : argument. Must be signed integral or flint.

Return value

\((-1)^n\) is returned.

Example

#include <eve/module/core.hpp>
#include <eve/wide.hpp>
#include <iostream>
 
using wide_it = eve::wide <std::int16_t, eve::fixed<8>>;
 
int main()
{
  wide_it pi = { 0, 1, 2, 3, -1, -32766, 32767, -32768};
 
  std::cout
    << "---- simd" << '\n'
    << "<- pi                   = " << pi << '\n'
    << "-> sign_alternate(pi)             = " << eve::sign_alternate(pi) << '\n';
 
 
  float xf = 2.0f;
 
  std::cout
    << "---- scalar"  << '\n'
    << "<- xf                   = " << xf << '\n'
    << "-> sign_alternate(xf)             = " << eve::sign_alternate(xf) << '\n';
 
  return 0;
}

Semantic Modifiers

• Masked Call

  The call eve;sign_alternate[mask](x) provides a masked version of eve::sign_alternate which is equivalent to if_else (mask, sign_alternate(x), x).

  Example

  #include <eve/module/core.hpp>
  #include <eve/wide.hpp>
  #include <iostream>
   
  using wide_it = eve::wide <std::int16_t, eve::fixed<8>>;
   
  int main()
  {
    wide_it pi = { 0, 1, 2, 3, -1, 32766, 32767, -32768};
   
    std::cout
      << "---- simd" << '\n'
      << "<- pi                          = " << pi << '\n'
      << "-> sign_alternate[pi <  2](pi)  = " << eve::sign_alternate[pi < 2](pi) << '\n';
    return 0;
  }