1// -*- C++ -*- C library enhancements header. 
2 
3// Copyright (C) 2016-2021 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 
46extern "C++" 
47{ 
48namespace 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// 2735. std::abs(short), std::abs(signed char) and others should return int 
68 
69#ifndef __CORRECT_ISO_CPP_MATH_H_PROTO 
70 inline _GLIBCXX_CONSTEXPR double 
71 abs(double __x) 
72 { return __builtin_fabs(__x); } 
73 
74 inline _GLIBCXX_CONSTEXPR float 
75 abs(float __x) 
76 { return __builtin_fabsf(__x); } 
77 
78 inline _GLIBCXX_CONSTEXPR long double 
79 abs(long double __x) 
80 { return __builtin_fabsl(__x); } 
81#endif 
82 
83#if defined(__GLIBCXX_TYPE_INT_N_0) 
84 inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_0 
85 abs(__GLIBCXX_TYPE_INT_N_0 __x) { return __x >= 0 ? __x : -__x; } 
86#endif 
87#if defined(__GLIBCXX_TYPE_INT_N_1) 
88 inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_1 
89 abs(__GLIBCXX_TYPE_INT_N_1 __x) { return __x >= 0 ? __x : -__x; } 
90#endif 
91#if defined(__GLIBCXX_TYPE_INT_N_2) 
92 inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_2 
93 abs(__GLIBCXX_TYPE_INT_N_2 __x) { return __x >= 0 ? __x : -__x; } 
94#endif 
95#if defined(__GLIBCXX_TYPE_INT_N_3) 
96 inline _GLIBCXX_CONSTEXPR __GLIBCXX_TYPE_INT_N_3 
97 abs(__GLIBCXX_TYPE_INT_N_3 __x) { return __x >= 0 ? __x : -__x; } 
98#endif 
99 
100#if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128) && !defined(__CUDACC__) 
101 inline _GLIBCXX_CONSTEXPR 
102 __float128 
103 abs(__float128 __x) 
104 { return __x < 0 ? -__x : __x; } 
105#endif 
106 
107_GLIBCXX_END_NAMESPACE_VERSION 
108} // namespace 
109} // extern "C"++" 
110 
111#endif // _GLIBCXX_BITS_STD_ABS_H 
112