oneminus

auto eve::oneminus = functor<oneminus_t>

inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   // Regular overloads
   constexpr auto oneminus(value auto x)                          noexcept; // 1
 
   // Lanes masking
   constexpr auto oneminus[conditional_expr auto c](value auto x) noexcept; // 2
   constexpr auto oneminus[logical_value auto m](value auto x)    noexcept; // 2
 
   // Semantic option
   constexpr auto oneminus[saturated ](value auto x)              noexcept; // 3
   constexpr auto oneminus[lower](value auto x)                   noexcept; // 4
   constexpr auto oneminus[upper](value auto x)                   noexcept; // 5
   constexpr auto oneminus[lower][strict](value auto x)           noexcept; // 4
   constexpr auto oneminus[upper][strict](value auto x)           noexcept; // 5
}

Parameters

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

Return value

1. The value of 1-x is returned.
2. The operation is performed conditionnaly.
3. saturated version.
4. The operation is computed in a 'round toward \(-\infty\) mode. The result is guaranted to be less or equal to the exact one (except for Nans). Combined with strict the option ensures generally faster computation, but strict inequality.
5. The operation is computed in a 'round toward \(\infty\) mode. The result is guaranted to be greater or equal to the exact one (except for Nans). Combined with strict the option ensures generally faster computation, but strict inequality.

Note

If an element of the expected result is not representable in the result type, the corresponding result element is undefined.

Example

// revision 0
#include <eve/module/core.hpp>
#include <iostream>
#include <iomanip>
 
int main()
{
  auto sml = eve::smallestposval(eve::as(1.0));
  eve::wide wf0{sml, -sml, 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 wu0{0u, 1u, 2u, 3u, 4u, 5u, 6u, 7u};
 
  std::cout << "<- wf0                           = " << wf0 << "\n";
  std::cout << "<- wi0                           = " << wi0 << "\n";
  std::cout << "<- wu0                           = " << wu0 << "\n";
 
  std::cout << "-> oneminus(wf0)                 = " << eve::oneminus(wf0) << "\n";
  std::cout << "-> oneminus[ignore_last(2)](wf0) = " << eve::oneminus[eve::ignore_last(2)](wf0) << "\n";
  std::cout << "-> oneminus[wf0 != 0](wf0)       = " << eve::oneminus[wf0 != 0](wf0) << "\n";
  std::cout << "-> oneminus[saturated ](wf0)     = " << eve::oneminus[eve::saturated ](wf0) << "\n";
  std::cout << "-> oneminus(wu0)                 = " << eve::oneminus(wu0) << "\n";
  std::cout << "-> oneminus(wi0)                 = " << eve::oneminus(wi0) << "\n";
  std::cout << std::setprecision(20) << "-> oneminus[lower](wf0)         = " << eve::oneminus[eve::lower](wf0) << "\n";
  std::cout << std::setprecision(20) << "-> oneminus[upper](wf0)         = " << eve::oneminus[eve::upper](wf0) << "\n";
  std::cout << std::setprecision(20) << "-> oneminus[lower][strict](wf0)   = " << eve::oneminus[eve::lower][eve::strict](wf0) << "\n";
  std::cout << std::setprecision(20) << "-> oneminus[upper][strict](wf0)   = " << eve::oneminus[eve::upper][eve::strict](wf0) << "\n";
 
}