libstdc++
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00001 // String Conversions -*- C++ -*- 00002 00003 // Copyright (C) 2008, 2009 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 #ifndef _STRING_CONVERSIONS_H 00026 #define _STRING_CONVERSIONS_H 1 00027 00028 #pragma GCC system_header 00029 00030 #include <ext/numeric_traits.h> 00031 #include <bits/functexcept.h> 00032 #include <cstddef> 00033 #include <cstdlib> 00034 #include <cwchar> 00035 #include <cstdio> 00036 #include <cerrno> 00037 00038 _GLIBCXX_BEGIN_NAMESPACE(__gnu_cxx) 00039 00040 // Helper for all the sto* functions. 00041 template<typename _TRet, typename _Ret = _TRet, typename _CharT, 00042 typename... _Base> 00043 _Ret 00044 __stoa(_TRet (*__convf) (const _CharT*, _CharT**, _Base...), 00045 const char* __name, const _CharT* __str, std::size_t* __idx, 00046 _Base... __base) 00047 { 00048 _Ret __ret; 00049 00050 _CharT* __endptr; 00051 errno = 0; 00052 const _TRet __tmp = __convf(__str, &__endptr, __base...); 00053 00054 if (__endptr == __str) 00055 std::__throw_invalid_argument(__name); 00056 else if (errno == ERANGE 00057 || (std::__are_same<_Ret, int>::__value 00058 && (__tmp < __numeric_traits<int>::__min 00059 || __tmp > __numeric_traits<int>::__max))) 00060 std::__throw_out_of_range(__name); 00061 else 00062 __ret = __tmp; 00063 00064 if (__idx) 00065 *__idx = __endptr - __str; 00066 00067 return __ret; 00068 } 00069 00070 // Helper for the to_string / to_wstring functions. 00071 template<typename _String, typename _CharT = typename _String::value_type> 00072 _String 00073 __to_xstring(int (*__convf) (_CharT*, std::size_t, const _CharT*, 00074 __builtin_va_list), std::size_t __n, 00075 const _CharT* __fmt, ...) 00076 { 00077 // XXX Eventually the result will be constructed in place in 00078 // the C++0x string, likely with the help of internal hooks. 00079 _CharT* __s = static_cast<_CharT*>(__builtin_alloca(sizeof(_CharT) 00080 * __n)); 00081 00082 __builtin_va_list __args; 00083 __builtin_va_start(__args, __fmt); 00084 00085 const int __len = __convf(__s, __n, __fmt, __args); 00086 00087 __builtin_va_end(__args); 00088 00089 return _String(__s, __s + __len); 00090 } 00091 00092 _GLIBCXX_END_NAMESPACE 00093 00094 #endif // _STRING_CONVERSIONS_H