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
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
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