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Edit File: std_abs.h

// -*- C++ -*- C library enhancements header. // Copyright (C) 2016-2021 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) 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) 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) 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) inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_3 abs(__GLIBCXX_TYPE_INT_N_3 __x) { return __x >= 0 ? __x : -__x; } #endif #if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128) inline _GLIBCXX_CONSTEXPR __float128 abs(__float128 __x) { return __x < 0 ? -__x : __x; } #endif _GLIBCXX_END_NAMESPACE_VERSION } // namespace } // extern "C"++" #endif // _GLIBCXX_BITS_STD_ABS_H