1 // -*- C++ -*- C library enhancements header. 2 3 // Copyright (C) 2016-2018 Free Software Foundation, Inc. 4 // 5 // This file is part of the GNU ISO C++ Library. This library is free 6 // software; you can redistribute it and/or modify it under the 7 // terms of the GNU General Public License as published by the 8 // Free Software Foundation; either version 3, or (at your option) 9 // any later version. 10 11 // This library is distributed in the hope that it will be useful, 12 // but WITHOUT ANY WARRANTY; without even the implied warranty of 13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 // GNU General Public License for more details. 15 16 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 /** @file include/bits/std_abs.h 26 * This is an internal header file, included by other library headers. 27 * Do not attempt to use it directly. @headername{cmath, cstdlib} 28 */ 29 30 #ifndef _GLIBCXX_BITS_STD_ABS_H 31 #define _GLIBCXX_BITS_STD_ABS_H 32 33 #pragma GCC system_header 34 35 #include <bits/c++config.h> 36 37 #define _GLIBCXX_INCLUDE_NEXT_C_HEADERS 38 #include_next <stdlib.h> 39 #ifdef __CORRECT_ISO_CPP_MATH_H_PROTO 40 # include_next <math.h> 41 #endif 42 #undef _GLIBCXX_INCLUDE_NEXT_C_HEADERS 43 44 #undef abs 45 46 extern "C++" 47 { 48 namespace std _GLIBCXX_VISIBILITY(default) 49 { 50 _GLIBCXX_BEGIN_NAMESPACE_VERSION 51 52 using ::abs; 53 54 #ifndef __CORRECT_ISO_CPP_STDLIB_H_PROTO 55 inline long 56 abs(long __i) { return __builtin_labs(__i); } 57 #endif 58 59 #ifdef _GLIBCXX_USE_LONG_LONG 60 inline long long 61 abs(long long __x) { return __builtin_llabs (__x); } 62 #endif 63 64 // _GLIBCXX_RESOLVE_LIB_DEFECTS 65 // 2192. Validity and return type of std::abs(0u) is unclear 66 // 2294. <cstdlib> should declare abs(double) 67 68 #ifndef __CORRECT_ISO_CPP_MATH_H_PROTO 69 inline _GLIBCXX_CONSTEXPR double 70 abs(double __x) 71 { return __builtin_fabs(__x); } 72 73 inline _GLIBCXX_CONSTEXPR float 74 abs(float __x) 75 { return __builtin_fabsf(__x); } 76 77 inline _GLIBCXX_CONSTEXPR long double 78 abs(long double __x) 79 { return __builtin_fabsl(__x); } 80 #endif 81 82 #if defined(__GLIBCXX_TYPE_INT_N_0) 83 inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_0 84 abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; } 85 #endif 86 #if defined(__GLIBCXX_TYPE_INT_N_1) 87 inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_1 88 abs(__GLIBCXX_TYPE_INT_N_1 __x) { return __x >= 0 ? __x : -__x; } 89 #endif 90 #if defined(__GLIBCXX_TYPE_INT_N_2) 91 inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_2 92 abs(__GLIBCXX_TYPE_INT_N_2 __x) { return __x >= 0 ? __x : -__x; } 93 #endif 94 #if defined(__GLIBCXX_TYPE_INT_N_3) 95 inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_3 96 abs(__GLIBCXX_TYPE_INT_N_3 __x) { return __x >= 0 ? __x : -__x; } 97 #endif 98 99 #if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128) 100 inline _GLIBCXX_CONSTEXPR 101 __float128 102 abs(__float128 __x) 103 { return __x < 0 ? -__x : __x; } 104 #endif 105 106 _GLIBCXX_END_NAMESPACE_VERSION 107 } // namespace 108 } 109 110 #endif // _GLIBCXX_BITS_STD_ABS_H 111