# 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