libstdc++

string_conversions.h
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1 // String Conversions -*- C++ -*-
2
3 // Copyright (C) 2008-2013 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 #if __cplusplus < 201103L
35 # include <bits/c++0x_warning.h>
36 #else
37
38 #include <bits/c++config.h>
39 #include <ext/numeric_traits.h>
40 #include <bits/functexcept.h>
41 #include <cstdlib>
42 #include <cwchar>
43 #include <cstdio>
44 #include <cerrno>
45
46 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default)
47 {
48 _GLIBCXX_BEGIN_NAMESPACE_VERSION
49
50 // Helper for all the sto* functions.
51 template<typename _TRet, typename _Ret = _TRet, typename _CharT,
52 typename... _Base>
53 _Ret
54 __stoa(_TRet (*__convf) (const _CharT*, _CharT**, _Base...),
55 const char* __name, const _CharT* __str, std::size_t* __idx,
56 _Base... __base)
57 {
58 _Ret __ret;
59
60 _CharT* __endptr;
61 errno = 0;
62 const _TRet __tmp = __convf(__str, &__endptr, __base...);
63
64 if (__endptr == __str)
65 std::__throw_invalid_argument(__name);
66 else if (errno == ERANGE
67 || (std::__are_same<_Ret, int>::__value
68 && (__tmp < __numeric_traits<int>::__min
69 || __tmp > __numeric_traits<int>::__max)))
70 std::__throw_out_of_range(__name);
71 else
72 __ret = __tmp;
73
74 if (__idx)
75 *__idx = __endptr - __str;
76
77 return __ret;
78 }
79
80 // Helper for the to_string / to_wstring functions.
81 template<typename _String, typename _CharT = typename _String::value_type>
82 _String
83 __to_xstring(int (*__convf) (_CharT*, std::size_t, const _CharT*,
84 __builtin_va_list), std::size_t __n,
85 const _CharT* __fmt, ...)
86 {
87 // XXX Eventually the result will be constructed in place in
88 // the C++0x string, likely with the help of internal hooks.
89 _CharT* __s = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT)
90 * __n));
91
92 __builtin_va_list __args;
93 __builtin_va_start(__args, __fmt);
94
95 const int __len = __convf(__s, __n, __fmt, __args);
96
97 __builtin_va_end(__args);
98
99 return _String(__s, __s + __len);
100 }
101
102 _GLIBCXX_END_NAMESPACE_VERSION
103 } // namespace
104
105 #endif // C++11
106
107 #endif // _STRING_CONVERSIONS_H