1 | // -*- C++ -*- C library enhancements header. |
2 | |
3 | // Copyright (C) 2016-2017 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 |
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) && !defined(__CUDACC__) |
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 | |