# basic_ios.tcc

    00001 // basic_ios locale and locale-related member functions -*- C++ -*-
    00002
    00003 // Copyright (C) 1999, 2001, 2002 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 2, 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 // You should have received a copy of the GNU General Public License along
    00017 // with this library; see the file COPYING.  If not, write to the Free
    00018 // Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
    00019 // USA.
    00020
    00021 // As a special exception, you may use this file as part of a free software
    00022 // library without restriction.  Specifically, if other files instantiate
    00023 // templates or use macros or inline functions from this file, or you compile
    00024 // this file and link it with other files to produce an executable, this
    00025 // file does not by itself cause the resulting executable to be covered by
    00026 // the GNU General Public License.  This exception does not however
    00027 // invalidate any other reasons why the executable file might be covered by
    00028 // the GNU General Public License.
    00029
    00030 #ifndef _CPP_BITS_BASICIOS_TCC
    00031 #define _CPP_BITS_BASICIOS_TCC 1
    00032
    00033 #pragma GCC system_header
    00034
    00035 namespace std
    00036 {
    00037   template<typename _CharT, typename _Traits>
    00038     void
    00039     basic_ios<_CharT, _Traits>::clear(iostate __state)
    00040     {
    00041       if (this->rdbuf())
    00042     _M_streambuf_state = __state;
    00043       else
    00044       _M_streambuf_state = __state | badbit;
    00045       if ((this->rdstate() & this->exceptions()))
    00046     __throw_ios_failure("basic_ios::clear(iostate) caused exception");
    00047     }
    00048
    00049   template<typename _CharT, typename _Traits>
    00050     basic_streambuf<_CharT, _Traits>*
    00051     basic_ios<_CharT, _Traits>::rdbuf(basic_streambuf<_CharT, _Traits>* __sb)
    00052     {
    00053       basic_streambuf<_CharT, _Traits>* __old = _M_streambuf;
    00054       _M_streambuf = __sb;
    00055       this->clear();
    00056       return __old;
    00057     }
    00058
    00059   template<typename _CharT, typename _Traits>
    00060     basic_ios<_CharT, _Traits>&
    00061     basic_ios<_CharT, _Traits>::copyfmt(const basic_ios& __rhs)
    00062     {
    00063       // Per 27.1.1.1, do not call imbue, yet must trash all caches
    00064       // associated with imbue()
    00065
    00066       // Alloc any new word array first, so if it fails we have "rollback".
    00067       _Words* __words = (__rhs._M_word_size <= _S_local_word_size) ?
    00068     _M_local_word : new _Words[__rhs._M_word_size];
    00069
    00070       // Bump refs before doing callbacks, for safety.
    00071       _Callback_list* __cb = __rhs._M_callbacks;
    00072       if (__cb)
    00073     __cb->_M_add_reference();
    00074       _M_call_callbacks(erase_event);
    00075       if (_M_word != _M_local_word)
    00076     {
    00077       delete [] _M_word;
    00078       _M_word = 0;
    00079     }
    00080       _M_dispose_callbacks();
    00081
    00082       _M_callbacks = __cb;  // NB: Don't want any added during above.
    00083       for (int __i = 0; __i < __rhs._M_word_size; ++__i)
    00084     __words[__i] = __rhs._M_word[__i];
    00085       if (_M_word != _M_local_word)
    00086     {
    00087       delete [] _M_word;
    00088       _M_word = 0;
    00089     }
    00090       _M_word = __words;
    00091       _M_word_size = __rhs._M_word_size;
    00092
    00093       this->flags(__rhs.flags());
    00094       this->width(__rhs.width());
    00095       this->precision(__rhs.precision());
    00096       this->tie(__rhs.tie());
    00097       this->fill(__rhs.fill());
    00098       // The next is required to be the last assignment.
    00099       this->exceptions(__rhs.exceptions());
    00100
    00101       _M_call_callbacks(copyfmt_event);
    00102       return *this;
    00103     }
    00104
    00105   template<typename _CharT, typename _Traits>
    00106     char
    00107     basic_ios<_CharT, _Traits>::narrow(char_type __c, char __dfault) const
    00108     {
    00109       char __ret = __dfault;
    00110       if (_M_check_facet(_M_fctype))
    00111     __ret = _M_fctype->narrow(__c, __dfault);
    00112       return __ret;
    00113     }
    00114
    00115   template<typename _CharT, typename _Traits>
    00116     _CharT
    00117     basic_ios<_CharT, _Traits>::widen(char __c) const
    00118     {
    00119       char_type __ret = char_type();
    00120       if (_M_check_facet(_M_fctype))
    00121     __ret = _M_fctype->widen(__c);
    00122       return __ret;
    00123     }
    00124
    00125   // Locales:
    00126   template<typename _CharT, typename _Traits>
    00127     locale
    00128     basic_ios<_CharT, _Traits>::imbue(const locale& __loc)
    00129     {
    00130       locale __old(this->getloc());
    00131       ios_base::imbue(__loc);
    00132       _M_cache_facets(__loc);
    00133       if (this->rdbuf() != 0)
    00134     this->rdbuf()->pubimbue(__loc);
    00135       return __old;
    00136     }
    00137
    00138   template<typename _CharT, typename _Traits>
    00139     void
    00140     basic_ios<_CharT, _Traits>::init(basic_streambuf<_CharT, _Traits>* __sb)
    00141     {
    00142       // NB: This may be called more than once on the same object.
    00143       ios_base::_M_init();
    00144       _M_cache_facets(_M_ios_locale);
    00145       _M_tie = 0;
    00146
    00147       // NB: The 27.4.4.1 Postconditions Table specifies requirements
    00148       // after basic_ios::init() has been called. As part of this,
    00149       // fill() must return widen(' ') any time after init() has been
    00150       // called, which needs an imbued ctype facet of char_type to
    00151       // return without throwing an exception. Unfortunately,
    00152       // ctype<char_type> is not necessarily a required facet, so
    00153       // streams with char_type != [char, wchar_t] will not have it by
    00154       // default. Because of this, the correct value for _M_fill is
    00155       // constructed on the first call of fill(). That way,
    00156       // unformatted input and output with non-required basic_ios
    00157       // instantiations is possible even without imbuing the expected
    00158       // ctype<char_type> facet.
    00159       _M_fill = 0;
    00160       _M_fill_init = false;
    00161
    00162       _M_exception = goodbit;
    00163       _M_streambuf = __sb;
    00164       _M_streambuf_state = __sb ? goodbit : badbit;
    00165     }
    00166
    00167   template<typename _CharT, typename _Traits>
    00168     void
    00169     basic_ios<_CharT, _Traits>::_M_cache_facets(const locale& __loc)
    00170     {
    00171       if (has_facet<__ctype_type>(__loc))
    00172     _M_fctype = &use_facet<__ctype_type>(__loc);
    00173       else
    00174     _M_fctype = 0;
    00175       // Should be filled in by ostream and istream, respectively.
    00176       if (has_facet<__numput_type>(__loc))
    00177     _M_fnumput = &use_facet<__numput_type>(__loc);
    00178       else
    00179     _M_fnumput = 0;
    00180       if (has_facet<__numget_type>(__loc))
    00181     _M_fnumget = &use_facet<__numget_type>(__loc);
    00182       else
    00183     _M_fnumget = 0;
    00184     }
    00185
    00186   // Inhibit implicit instantiations for required instantiations,
    00187   // which are defined via explicit instantiations elsewhere.
    00188   // NB:  This syntax is a GNU extension.
    00189   extern template class basic_ios<char>;
    00190   extern template class basic_ios<wchar_t>;
    00191 } // namespace std
    00192
    00193 #endif