libstdc++
string_conversions.h
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1 // String Conversions -*- C++ -*-
2 
3 // Copyright (C) 2008, 2009, 2010 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 ext/string_conversions.h
26  * This file is a GNU extension to the Standard C++ Library.
27  */
28 
29 #ifndef _STRING_CONVERSIONS_H
30 #define _STRING_CONVERSIONS_H 1
31 
32 #pragma GCC system_header
33 
34 #include <bits/c++config.h>
35 #include <ext/numeric_traits.h>
36 #include <bits/functexcept.h>
37 #include <cstdlib>
38 #include <cwchar>
39 #include <cstdio>
40 #include <cerrno>
41 
42 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
43 {
44 _GLIBCXX_BEGIN_NAMESPACE_VERSION
45 
46  // Helper for all the sto* functions.
47  template<typename _TRet, typename _Ret = _TRet, typename _CharT,
48  typename... _Base>
49  _Ret
50  __stoa(_TRet (*__convf) (const _CharT*, _CharT**, _Base...),
51  const char* __name, const _CharT* __str, std::size_t* __idx,
52  _Base... __base)
53  {
54  _Ret __ret;
55 
56  _CharT* __endptr;
57  errno = 0;
58  const _TRet __tmp = __convf(__str, &__endptr, __base...);
59 
60  if (__endptr == __str)
61  std::__throw_invalid_argument(__name);
62  else if (errno == ERANGE
63  || (std::__are_same<_Ret, int>::__value
64  && (__tmp < __numeric_traits<int>::__min
65  || __tmp > __numeric_traits<int>::__max)))
66  std::__throw_out_of_range(__name);
67  else
68  __ret = __tmp;
69 
70  if (__idx)
71  *__idx = __endptr - __str;
72 
73  return __ret;
74  }
75 
76  // Helper for the to_string / to_wstring functions.
77  template<typename _String, typename _CharT = typename _String::value_type>
78  _String
79  __to_xstring(int (*__convf) (_CharT*, std::size_t, const _CharT*,
80  __builtin_va_list), std::size_t __n,
81  const _CharT* __fmt, ...)
82  {
83  // XXX Eventually the result will be constructed in place in
84  // the C++0x string, likely with the help of internal hooks.
85  _CharT* __s = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT)
86  * __n));
87 
88  __builtin_va_list __args;
89  __builtin_va_start(__args, __fmt);
90 
91  const int __len = __convf(__s, __n, __fmt, __args);
92 
93  __builtin_va_end(__args);
94 
95  return _String(__s, __s + __len);
96  }
97 
98 _GLIBCXX_END_NAMESPACE_VERSION
99 } // namespace
100 
101 #endif // _STRING_CONVERSIONS_H
_Siter_base< _Iterator >::iterator_type __base(_Iterator __it)