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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