chromium/third_party/libc++/src/include/__math/hypot.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_HYPOT_H
#define _LIBCPP___MATH_HYPOT_H

#include <__algorithm/max.h>
#include <__config>
#include <__math/abs.h>
#include <__math/exponential_functions.h>
#include <__math/roots.h>
#include <__type_traits/enable_if.h>
#include <__type_traits/is_arithmetic.h>
#include <__type_traits/is_same.h>
#include <__type_traits/promote.h>
#include <__utility/pair.h>
#include <limits>

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

_LIBCPP_PUSH_MACROS
#include <__undef_macros>

_LIBCPP_BEGIN_NAMESPACE_STD

namespace __math {

inline _LIBCPP_HIDE_FROM_ABI float hypot(float __x, float __y) _NOEXCEPT { … }

template <class = int>
_LIBCPP_HIDE_FROM_ABI double hypot(double __x, double __y) _NOEXCEPT { … }

inline _LIBCPP_HIDE_FROM_ABI long double hypot(long double __x, long double __y) _NOEXCEPT { … }

template <class _A1, class _A2, __enable_if_t<is_arithmetic<_A1>::value && is_arithmetic<_A2>::value, int> = 0>
inline _LIBCPP_HIDE_FROM_ABI typename __promote<_A1, _A2>::type hypot(_A1 __x, _A2 __y) _NOEXCEPT { … }

#if _LIBCPP_STD_VER >= 17
// Computes the three-dimensional hypotenuse: `std::hypot(x,y,z)`.
// The naive implementation might over-/underflow which is why this implementation is more involved:
//    If the square of an argument might run into issues, we scale the arguments appropriately.
// See https://github.com/llvm/llvm-project/issues/92782 for a detailed discussion and summary.
template <class _Real>
_LIBCPP_HIDE_FROM_ABI _Real __hypot(_Real __x, _Real __y, _Real __z) { … }

inline _LIBCPP_HIDE_FROM_ABI float hypot(float __x, float __y, float __z) { … }

inline _LIBCPP_HIDE_FROM_ABI double hypot(double __x, double __y, double __z) { … }

inline _LIBCPP_HIDE_FROM_ABI long double hypot(long double __x, long double __y, long double __z) { … }

template <class _A1,
          class _A2,
          class _A3,
          std::enable_if_t< is_arithmetic_v<_A1> && is_arithmetic_v<_A2> && is_arithmetic_v<_A3>, int> = 0 >
_LIBCPP_HIDE_FROM_ABI typename __promote<_A1, _A2, _A3>::type hypot(_A1 __x, _A2 __y, _A3 __z) _NOEXCEPT { … }
#endif

} // namespace __math

_LIBCPP_END_NAMESPACE_STD
_LIBCPP_POP_MACROS

#endif // _LIBCPP___MATH_HYPOT_H