std_abs.h
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// -*- C++ -*- C library enhancements header.
// Copyright (C) 2016-2024 Free Software Foundation, Inc.
//
// This file is part of the GNU ISO C++ Library. This library is free
// software; you can redistribute it and/or modify it under the
// terms of the GNU General Public License as published by the
// Free Software Foundation; either version 3, or (at your option)
// any later version.
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
// Under Section 7 of GPL version 3, you are granted additional
// permissions described in the GCC Runtime Library Exception, version
// 3.1, as published by the Free Software Foundation.
// You should have received a copy of the GNU General Public License and
// a copy of the GCC Runtime Library Exception along with this program;
// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
// <http://www.gnu.org/licenses/>.
/** @file include/bits/std_abs.h
* This is an internal header file, included by other library headers.
* Do not attempt to use it directly. @headername{cmath, cstdlib}
*/
#ifndef _GLIBCXX_BITS_STD_ABS_H
#define _GLIBCXX_BITS_STD_ABS_H
#pragma GCC system_header
#include <bits/c++config.h>
#define _GLIBCXX_INCLUDE_NEXT_C_HEADERS
#include_next <stdlib.h>
#ifdef __CORRECT_ISO_CPP_MATH_H_PROTO
# include_next <math.h>
#endif
#undef _GLIBCXX_INCLUDE_NEXT_C_HEADERS
#undef abs
extern "C++"
{
namespace std _GLIBCXX_VISIBILITY(default)
{
_GLIBCXX_BEGIN_NAMESPACE_VERSION
using ::abs;
#ifndef __CORRECT_ISO_CPP_STDLIB_H_PROTO
inline long
abs(long __i) { return __builtin_labs(__i); }
#endif
#ifdef _GLIBCXX_USE_LONG_LONG
inline long long
abs(long long __x) { return __builtin_llabs (__x); }
#endif
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 2192. Validity and return type of std::abs(0u) is unclear
// 2294. <cstdlib> should declare abs(double)
// 2735. std::abs(short), std::abs(signed char) and others should return int
#ifndef __CORRECT_ISO_CPP_MATH_H_PROTO
inline _GLIBCXX_CONSTEXPR double
abs(double __x)
{ return __builtin_fabs(__x); }
inline _GLIBCXX_CONSTEXPR float
abs(float __x)
{ return __builtin_fabsf(__x); }
inline _GLIBCXX_CONSTEXPR long double
abs(long double __x)
{ return __builtin_fabsl(__x); }
#endif
#if defined(__GLIBCXX_TYPE_INT_N_0)
__extension__ inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_0
abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; }
#endif
#if defined(__GLIBCXX_TYPE_INT_N_1)
__extension__ inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_1
abs(__GLIBCXX_TYPE_INT_N_1 __x) { return __x >= 0 ? __x : -__x; }
#endif
#if defined(__GLIBCXX_TYPE_INT_N_2)
__extension__ inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_2
abs(__GLIBCXX_TYPE_INT_N_2 __x) { return __x >= 0 ? __x : -__x; }
#endif
#if defined(__GLIBCXX_TYPE_INT_N_3)
__extension__ inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_3
abs(__GLIBCXX_TYPE_INT_N_3 __x) { return __x >= 0 ? __x : -__x; }
#endif
#if defined(__STDCPP_FLOAT16_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32)
constexpr _Float16
abs(_Float16 __x)
{ return _Float16(__builtin_fabsf(__x)); }
#endif
#if defined(__STDCPP_FLOAT32_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32)
constexpr _Float32
abs(_Float32 __x)
{ return __builtin_fabsf(__x); }
#endif
#if defined(__STDCPP_FLOAT64_T__) && defined(_GLIBCXX_DOUBLE_IS_IEEE_BINARY64)
constexpr _Float64
abs(_Float64 __x)
{ return __builtin_fabs(__x); }
#endif
#if defined(__STDCPP_FLOAT128_T__) && defined(_GLIBCXX_LDOUBLE_IS_IEEE_BINARY128)
constexpr _Float128
abs(_Float128 __x)
{ return __builtin_fabsl(__x); }
#elif defined(__STDCPP_FLOAT128_T__) && defined(_GLIBCXX_HAVE_FLOAT128_MATH)
constexpr _Float128
abs(_Float128 __x)
{ return __builtin_fabsf128(__x); }
#endif
#if defined(__STDCPP_BFLOAT16_T__) && defined(_GLIBCXX_FLOAT_IS_IEEE_BINARY32)
constexpr __gnu_cxx::__bfloat16_t
abs(__gnu_cxx::__bfloat16_t __x)
{ return __gnu_cxx::__bfloat16_t(__builtin_fabsf(__x)); }
#endif
#if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128) && !defined(__CUDACC__)
__extension__ inline _GLIBCXX_CONSTEXPR
__float128
abs(__float128 __x)
{
#if defined(_GLIBCXX_LDOUBLE_IS_IEEE_BINARY128)
return __builtin_fabsl(__x);
#elif defined(_GLIBCXX_HAVE_FLOAT128_MATH)
return __builtin_fabsf128(__x);
#else
// Assume that __builtin_signbit works for __float128.
return __builtin_signbit(__x) ? -__x : __x;
#endif
}
#endif
_GLIBCXX_END_NAMESPACE_VERSION
} // namespace
} // extern "C++"
#endif // _GLIBCXX_BITS_STD_ABS_H
c++config.h
std::abs
_Tp abs(const complex< _Tp > &)
Return magnitude of z.
Definition complex:892
std
ISO C++ entities toplevel namespace is std.