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 = _CharT();
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 
00191 #ifdef _GLIBCPP_USE_WCHAR_T
00192   extern template class basic_ios<wchar_t>;
00193 #endif
00194 } // namespace std
00195 
00196 #endif 

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