include/__math/fdim.h

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP___MATH_FDIM_H
#define _LIBCPP___MATH_FDIM_H

#include <__config>
#include <__type_traits/enable_if.h>
#include <__type_traits/is_arithmetic.h>
#include <__type_traits/is_same.h>
#include <__type_traits/promote.h>

#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#  pragma GCC system_header
#endif

_LIBCPP_BEGIN_NAMESPACE_STD

namespace __math {

inline _LIBCPP_HIDE_FROM_ABI float       fdim(float __x, float __y) _NOEXCEPT             {return __builtin_fdimf(__x, __y);}

template <class = int>
_LIBCPP_HIDE_FROM_ABI double fdim(double __x, double __y) _NOEXCEPT {
  return __builtin_fdim(__x, __y);
}

inline _LIBCPP_HIDE_FROM_ABI long double fdim(long double __x, long double __y) _NOEXCEPT {return __builtin_fdiml(__x, __y);}

template <class _A1, class _A2>
inline _LIBCPP_HIDE_FROM_ABI
typename std::__enable_if_t
<
    std::is_arithmetic<_A1>::value &&
    std::is_arithmetic<_A2>::value,
    std::__promote<_A1, _A2>
>::type
fdim(_A1 __x, _A2 __y) _NOEXCEPT
{
    typedef typename std::__promote<_A1, _A2>::type __result_type;
    static_assert((!(std::_IsSame<_A1, __result_type>::value &&
                     std::_IsSame<_A2, __result_type>::value)), "");
    return __math::fdim((__result_type)__x, (__result_type)__y);
}

} // namespace __math

_LIBCPP_END_NAMESPACE_STD

#endif // _LIBCPP___MATH_FDIM_H