frac

auto eve::frac = functor<frac_t>

inlineconstexpr

Header file

#include <eve/module/core.hpp>

Callable Signatures

namespace eve
{
   // Regular overload
   constexpr auto frac(value auto x)                          noexcept; // 1
 
   // Lanes masking
   constexpr auto frac[conditional_expr auto c](value auto x) noexcept; // 2
   constexpr auto frac[logical_value auto m](value auto x)    noexcept; // 2
 
   // Semantic options
   constexpr auto frac[raw](floating_value auto x)            noexcept; // 3
   constexpr auto frac[pedantic](floating_value auto x)       noexcept  // 4
   constexpr auto frac[almost = tol](floating_value auto x)   noexcept; // 5
   constexpr auto frac[almost](floating_value auto x)         noexcept; // 6
}

Parameters

• x :value argument.
• c: Conditional expression masking the operation.
• m: Logical value masking the operation.
• tol scalar_value tolerance.

Return value

1. The fractional part of x with the same sign as x: x-trunc(x), but keeping the zero sign.
2. The operation is performed conditionnaly.
3. just x-trunc(x).
4. zeros and not finite values are all handled properly.
5. almost allows a fuzzy interpretation of frac using internally the almost version of trunc.
6. with no tolerance value, the call is equivalent to frac[tolerance = 3*eps(as(x))(x)

External references

• C++ standard reference
• Wikipedia