string_conversions.h

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

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