libstdc++
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00001 // String Conversions -*- C++ -*- 00002 00003 // Copyright (C) 2008-2016 Free Software Foundation, Inc. 00004 // 00005 // This file is part of the GNU ISO C++ Library. This library is free 00006 // software; you can redistribute it and/or modify it under the 00007 // terms of the GNU General Public License as published by the 00008 // Free Software Foundation; either version 3, or (at your option) 00009 // any later version. 00010 00011 // This library is distributed in the hope that it will be useful, 00012 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00013 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00014 // GNU General Public License for more details. 00015 00016 // Under Section 7 of GPL version 3, you are granted additional 00017 // permissions described in the GCC Runtime Library Exception, version 00018 // 3.1, as published by the Free Software Foundation. 00019 00020 // You should have received a copy of the GNU General Public License and 00021 // a copy of the GCC Runtime Library Exception along with this program; 00022 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00023 // <http://www.gnu.org/licenses/>. 00024 00025 /** @file ext/string_conversions.h 00026 * This file is a GNU extension to the Standard C++ Library. 00027 */ 00028 00029 #ifndef _STRING_CONVERSIONS_H 00030 #define _STRING_CONVERSIONS_H 1 00031 00032 #pragma GCC system_header 00033 00034 #if __cplusplus < 201103L 00035 # include <bits/c++0x_warning.h> 00036 #else 00037 00038 #include <bits/c++config.h> 00039 #include <ext/numeric_traits.h> 00040 #include <bits/functexcept.h> 00041 #include <cstdlib> 00042 #include <cwchar> 00043 #include <cstdio> 00044 #include <cerrno> 00045 00046 namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) 00047 { 00048 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00049 00050 // Helper for all the sto* functions. 00051 template<typename _TRet, typename _Ret = _TRet, typename _CharT, 00052 typename... _Base> 00053 _Ret 00054 __stoa(_TRet (*__convf) (const _CharT*, _CharT**, _Base...), 00055 const char* __name, const _CharT* __str, std::size_t* __idx, 00056 _Base... __base) 00057 { 00058 _Ret __ret; 00059 00060 _CharT* __endptr; 00061 00062 struct _Save_errno { 00063 _Save_errno() : _M_errno(errno) { errno = 0; } 00064 ~_Save_errno() { if (errno == 0) errno = _M_errno; } 00065 int _M_errno; 00066 } const __save_errno; 00067 00068 const _TRet __tmp = __convf(__str, &__endptr, __base...); 00069 00070 if (__endptr == __str) 00071 std::__throw_invalid_argument(__name); 00072 else if (errno == ERANGE 00073 || (std::__are_same<_Ret, int>::__value 00074 && (__tmp < __numeric_traits<int>::__min 00075 || __tmp > __numeric_traits<int>::__max))) 00076 std::__throw_out_of_range(__name); 00077 else 00078 __ret = __tmp; 00079 00080 if (__idx) 00081 *__idx = __endptr - __str; 00082 00083 return __ret; 00084 } 00085 00086 // Helper for the to_string / to_wstring functions. 00087 template<typename _String, typename _CharT = typename _String::value_type> 00088 _String 00089 __to_xstring(int (*__convf) (_CharT*, std::size_t, const _CharT*, 00090 __builtin_va_list), std::size_t __n, 00091 const _CharT* __fmt, ...) 00092 { 00093 // XXX Eventually the result will be constructed in place in 00094 // the C++0x string, likely with the help of internal hooks. 00095 _CharT* __s = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) 00096 * __n)); 00097 00098 __builtin_va_list __args; 00099 __builtin_va_start(__args, __fmt); 00100 00101 const int __len = __convf(__s, __n, __fmt, __args); 00102 00103 __builtin_va_end(__args); 00104 00105 return _String(__s, __s + __len); 00106 } 00107 00108 _GLIBCXX_END_NAMESPACE_VERSION 00109 } // namespace 00110 00111 #endif // C++11 00112 00113 #endif // _STRING_CONVERSIONS_H