negate

auto eve::negate = functor<negate_t>

inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   // Regular overload
   constexpr auto negate(value auto x, value auto y)                          noexcept; // 1
 
   // Lanes masking
   constexpr auto negate[conditional_expr auto c](value auto x, value auto y) noexcept; // 2
   constexpr auto negate[logical_value auto m](value auto , value auto yx)    noexcept; // 2
}

Parameters

• x, y: arguments.
• tup: non empty tuple of arguments.
• c: Conditional expression masking the operation.
• m: Logical value masking the operation.

Return value

1. The elementwise product of the first parameter by the sign of the second is returned.
2. The operation is performed conditionnaly

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};
  eve::wide wf1{0.0, -4.0, 1.0, -1.0, 2.0, -2.0, 3.0, -3.0};
  eve::wide wi0{0, 1, 2, 3, -1, -2, -3, -4};
  eve::wide wi1{0, -4, 1, -1, 2, -2, 3, -3};
  eve::wide wu0{0u, 1u, 2u, 3u, 4u, 5u, 6u, 7u};
  eve::wide wu1{7u, 6u, 5u, 4u, 3u, 2u, 1u, 0u};
 
  std::cout << "<- wf0                              = " << wf0 << "\n";
  std::cout << "<- wf1                              = " << wf1 << "\n";
  std::cout << "<- wi0                              = " << wi0 << "\n";
  std::cout << "<- wi1                              = " << wi1 << "\n";
  std::cout << "<- wu0                              = " << wu0 << "\n";
  std::cout << "<- wu1                              = " << wu1 << "\n";
                                                    
  std::cout << "-> negate(wf0, wf1)                 = " << eve::negate(wf0, wf1) << "\n";
  std::cout << "-> negate[ignore_last(2)](wf0, wf1) = " << eve::negate[eve::ignore_last(2)](wf0, wf1) << "\n";
  std::cout << "-> negate[wf0 != 0](wf0, wf1)       = " << eve::negate[wf0 != 0](wf0, wf1) << "\n";
  std::cout << "-> negate(wu0, wu1)                 = " << eve::negate(wu0, wu1) << "\n";
  std::cout << "-> negate[ignore_last(2)](wu0, wu1) = " << eve::negate[eve::ignore_last(2)](wu0, wu1) << "\n";
  std::cout << "-> negate[wu0 != 0](wu0, wu1)       = " << eve::negate[wu0 != 0](wu0, wu1) << "\n";
  std::cout << "-> negate(wi0, wi1)                 = " << eve::negate(wi0, wi1) << "\n";
  std::cout << "-> negate[ignore_last(2)](wi0, wi1) = " << eve::negate[eve::ignore_last(2)](wi0, wi1) << "\n";
  std::cout << "-> negate[wi0 != 0](wi0, wi1)       = " << eve::negate[wi0 != 0](wi0, wi1) << "\n";
}