1 // -*- C++ -*- C library enhancements header.
3 // Copyright (C) 2016 Free Software Foundation, Inc.
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)
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.
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.
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/>.
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}
30 #ifndef _GLIBCXX_BITS_STD_ABS_H
31 #define _GLIBCXX_BITS_STD_ABS_H
33 #pragma GCC system_header
35 #include <bits/c++config.h>
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>
42 #undef _GLIBCXX_INCLUDE_NEXT_C_HEADERS
48 namespace std
_GLIBCXX_VISIBILITY(default)
50 _GLIBCXX_BEGIN_NAMESPACE_VERSION
54 #ifndef __CORRECT_ISO_CPP_STDLIB_H_PROTO
56 abs(long __i
) { return __builtin_labs(__i
); }
59 #ifdef _GLIBCXX_USE_LONG_LONG
61 abs(long long __x
) { return __builtin_llabs (__x
); }
64 // _GLIBCXX_RESOLVE_LIB_DEFECTS
65 // 2192. Validity and return type of std::abs(0u) is unclear
66 // 2294. <cstdlib> should declare abs(double)
68 #ifndef __CORRECT_ISO_CPP_MATH_H_PROTO
69 inline _GLIBCXX_CONSTEXPR
double
71 { return __builtin_fabs(__x
); }
73 inline _GLIBCXX_CONSTEXPR
float
75 { return __builtin_fabsf(__x
); }
77 inline _GLIBCXX_CONSTEXPR
long double
79 { return __builtin_fabsl(__x
); }
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
; }
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
; }
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
; }
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
; }
99 #if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_FLOAT128)
100 inline _GLIBCXX_CONSTEXPR
103 { return __x
< 0 ? -__x
: __x
; }
106 _GLIBCXX_END_NAMESPACE_VERSION
110 #endif // _GLIBCXX_BITS_STD_ABS_H