libstdc++
cstdlib
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1 // -*- C++ -*- forwarding header.
2 
3 // Copyright (C) 1997-2014 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/cstdlib
26  * This is a Standard C++ Library file. You should @c \#include this file
27  * in your programs, rather than any of the @a *.h implementation files.
28  *
29  * This is the C++ version of the Standard C Library header @c stdlib.h,
30  * and its contents are (mostly) the same as that header, but are all
31  * contained in the namespace @c std (except for names which are defined
32  * as macros in C).
33  */
34 
35 //
36 // ISO C++ 14882: 20.4.6 C library
37 //
38 
39 #pragma GCC system_header
40 
41 #include <bits/c++config.h>
42 
43 #ifndef _GLIBCXX_CSTDLIB
44 #define _GLIBCXX_CSTDLIB 1
45 
46 #if !_GLIBCXX_HOSTED
47 // The C standard does not require a freestanding implementation to
48 // provide <stdlib.h>. However, the C++ standard does still require
49 // <cstdlib> -- but only the functionality mentioned in
50 // [lib.support.start.term].
51 
52 #define EXIT_SUCCESS 0
53 #define EXIT_FAILURE 1
54 
55 namespace std
56 {
57  extern "C" void abort(void) throw () _GLIBCXX_NORETURN;
58  extern "C" int atexit(void (*)(void)) throw ();
59  extern "C" void exit(int) throw () _GLIBCXX_NORETURN;
60 #if __cplusplus >= 201103L
61 # ifdef _GLIBCXX_HAVE_AT_QUICK_EXIT
62  extern "C" int at_quick_exit(void (*)(void)) throw ();
63 # endif
64 # ifdef _GLIBCXX_HAVE_QUICK_EXIT
65  extern "C" void quick_exit(int) throw() _GLIBCXX_NORETURN;
66 # endif
67 #endif
68 } // namespace std
69 
70 #else
71 
72 #include <stdlib.h>
73 
74 // Get rid of those macros defined in <stdlib.h> in lieu of real functions.
75 #undef abort
76 #undef abs
77 #undef atexit
78 #if __cplusplus >= 201103L
79 # ifdef _GLIBCXX_HAVE_AT_QUICK_EXIT
80 # undef at_quick_exit
81 # endif
82 #endif
83 #undef atof
84 #undef atoi
85 #undef atol
86 #undef bsearch
87 #undef calloc
88 #undef div
89 #undef exit
90 #undef free
91 #undef getenv
92 #undef labs
93 #undef ldiv
94 #undef malloc
95 #undef mblen
96 #undef mbstowcs
97 #undef mbtowc
98 #undef qsort
99 #if __cplusplus >= 201103L
100 # ifdef _GLIBCXX_HAVE_QUICK_EXIT
101 # undef quick_exit
102 # endif
103 #endif
104 #undef rand
105 #undef realloc
106 #undef srand
107 #undef strtod
108 #undef strtol
109 #undef strtoul
110 #undef system
111 #undef wcstombs
112 #undef wctomb
113 
114 namespace std _GLIBCXX_VISIBILITY(default)
115 {
116 _GLIBCXX_BEGIN_NAMESPACE_VERSION
117 
118  using ::div_t;
119  using ::ldiv_t;
120 
121  using ::abort;
122  using ::abs;
123  using ::atexit;
124 #if __cplusplus >= 201103L
125 # ifdef _GLIBCXX_HAVE_AT_QUICK_EXIT
126  using ::at_quick_exit;
127 # endif
128 #endif
129  using ::atof;
130  using ::atoi;
131  using ::atol;
132  using ::bsearch;
133  using ::calloc;
134  using ::div;
135  using ::exit;
136  using ::free;
137  using ::getenv;
138  using ::labs;
139  using ::ldiv;
140  using ::malloc;
141 #ifdef _GLIBCXX_HAVE_MBSTATE_T
142  using ::mblen;
143  using ::mbstowcs;
144  using ::mbtowc;
145 #endif // _GLIBCXX_HAVE_MBSTATE_T
146  using ::qsort;
147 #if __cplusplus >= 201103L
148 # ifdef _GLIBCXX_HAVE_QUICK_EXIT
149  using ::quick_exit;
150 # endif
151 #endif
152  using ::rand;
153  using ::realloc;
154  using ::srand;
155  using ::strtod;
156  using ::strtol;
157  using ::strtoul;
158  using ::system;
159 #ifdef _GLIBCXX_USE_WCHAR_T
160  using ::wcstombs;
161  using ::wctomb;
162 #endif // _GLIBCXX_USE_WCHAR_T
163 
164 #ifndef __CORRECT_ISO_CPP_STDLIB_H_PROTO
165  inline long
166  abs(long __i) { return __builtin_labs(__i); }
167 
168  inline ldiv_t
169  div(long __i, long __j) { return ldiv(__i, __j); }
170 #endif
171 
172 #ifdef _GLIBCXX_USE_LONG_LONG
173  inline long long
174  abs(long long __x) { return __builtin_llabs (__x); }
175 #endif
176 
177 #if !defined(__STRICT_ANSI__) && defined(_GLIBCXX_USE_INT128)
178  inline __int128
179  abs(__int128 __x) { return __x >= 0 ? __x : -__x; }
180 #endif
181 
182 _GLIBCXX_END_NAMESPACE_VERSION
183 } // namespace
184 
185 #if _GLIBCXX_USE_C99
186 
187 #undef _Exit
188 #undef llabs
189 #undef lldiv
190 #undef atoll
191 #undef strtoll
192 #undef strtoull
193 #undef strtof
194 #undef strtold
195 
196 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
197 {
198 _GLIBCXX_BEGIN_NAMESPACE_VERSION
199 
200 #if !_GLIBCXX_USE_C99_LONG_LONG_DYNAMIC
201  using ::lldiv_t;
202 #endif
203 #if _GLIBCXX_USE_C99_CHECK || _GLIBCXX_USE_C99_DYNAMIC
204  extern "C" void (_Exit)(int) throw () _GLIBCXX_NORETURN;
205 #endif
206 #if !_GLIBCXX_USE_C99_DYNAMIC
207  using ::_Exit;
208 #endif
209 
210 #if !_GLIBCXX_USE_C99_LONG_LONG_DYNAMIC
211  using ::llabs;
212 
213  inline lldiv_t
214  div(long long __n, long long __d)
215  { lldiv_t __q; __q.quot = __n / __d; __q.rem = __n % __d; return __q; }
216 
217  using ::lldiv;
218 #endif
219 
220 #if _GLIBCXX_USE_C99_LONG_LONG_CHECK || _GLIBCXX_USE_C99_LONG_LONG_DYNAMIC
221  extern "C" long long int (atoll)(const char *) throw ();
222  extern "C" long long int
223  (strtoll)(const char * __restrict, char ** __restrict, int) throw ();
224  extern "C" unsigned long long int
225  (strtoull)(const char * __restrict, char ** __restrict, int) throw ();
226 #endif
227 #if !_GLIBCXX_USE_C99_LONG_LONG_DYNAMIC
228  using ::atoll;
229  using ::strtoll;
230  using ::strtoull;
231 #endif
232  using ::strtof;
233  using ::strtold;
234 
235 _GLIBCXX_END_NAMESPACE_VERSION
236 } // namespace __gnu_cxx
237 
238 namespace std
239 {
240 #if !_GLIBCXX_USE_C99_LONG_LONG_DYNAMIC
241  using ::__gnu_cxx::lldiv_t;
242 #endif
243  using ::__gnu_cxx::_Exit;
244 #if !_GLIBCXX_USE_C99_LONG_LONG_DYNAMIC
245  using ::__gnu_cxx::llabs;
246  using ::__gnu_cxx::div;
247  using ::__gnu_cxx::lldiv;
248 #endif
249  using ::__gnu_cxx::atoll;
250  using ::__gnu_cxx::strtof;
251  using ::__gnu_cxx::strtoll;
252  using ::__gnu_cxx::strtoull;
253  using ::__gnu_cxx::strtold;
254 } // namespace std
255 
256 #endif // _GLIBCXX_USE_C99
257 
258 #endif // !_GLIBCXX_HOSTED
259 
260 #endif
std::abs
_Tp abs(const complex< _Tp > &)
Return magnitude of z.
Definition: complex:596