libcxx/include/__math/fdim.h

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef _LIBCPP___MATH_FDIM_H
  10 #define _LIBCPP___MATH_FDIM_H
  11
  12 #include <__config>
  13 #include <__type_traits/enable_if.h>
  14 #include <__type_traits/is_arithmetic.h>
  15 #include <__type_traits/is_same.h>
  16 #include <__type_traits/promote.h>
  17
  18 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  19 #  pragma GCC system_header
  20 #endif
  21
  22 _LIBCPP_BEGIN_NAMESPACE_STD
  23
  24 namespace __math {
  25
  26 inline _LIBCPP_HIDE_FROM_ABI float fdim(float __x, float __y) _NOEXCEPT { return __builtin_fdimf(__x, __y); }
  27
  28 template <class = int>
  29 _LIBCPP_HIDE_FROM_ABI double fdim(double __x, double __y) _NOEXCEPT {
  30   return __builtin_fdim(__x, __y);
  31 }
  32
  33 inline _LIBCPP_HIDE_FROM_ABI long double fdim(long double __x, long double __y) _NOEXCEPT {
  34   return __builtin_fdiml(__x, __y);
  35 }
  36
  37 template <class _A1, class _A2, __enable_if_t<is_arithmetic<_A1>::value && is_arithmetic<_A2>::value, int> = 0>
  38 inline _LIBCPP_HIDE_FROM_ABI typename __promote<_A1, _A2>::type fdim(_A1 __x, _A2 __y) _NOEXCEPT {
  39   using __result_type = typename __promote<_A1, _A2>::type;
  40   static_assert((!(_IsSame<_A1, __result_type>::value && _IsSame<_A2, __result_type>::value)), "");
  41   return __math::fdim((__result_type)__x, (__result_type)__y);
  42 }
  43
  44 } // namespace __math
  45
  46 _LIBCPP_END_NAMESPACE_STD
  47
  48 #endif // _LIBCPP___MATH_FDIM_H