basic_ios.tcc revision 107606
1// basic_ios locale and locale-related member functions -*- C++ -*- 2 3// Copyright (C) 1999, 2001, 2002 Free Software Foundation, Inc. 4// 5// This file is part of the GNU ISO C++ Library. This library is free 6// software; you can redistribute it and/or modify it under the 7// terms of the GNU General Public License as published by the 8// Free Software Foundation; either version 2, or (at your option) 9// any later version. 10 11// This library is distributed in the hope that it will be useful, 12// but WITHOUT ANY WARRANTY; without even the implied warranty of 13// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14// GNU General Public License for more details. 15 16// You should have received a copy of the GNU General Public License along 17// with this library; see the file COPYING. If not, write to the Free 18// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, 19// USA. 20 21// As a special exception, you may use this file as part of a free software 22// library without restriction. Specifically, if other files instantiate 23// templates or use macros or inline functions from this file, or you compile 24// this file and link it with other files to produce an executable, this 25// file does not by itself cause the resulting executable to be covered by 26// the GNU General Public License. This exception does not however 27// invalidate any other reasons why the executable file might be covered by 28// the GNU General Public License. 29 30#ifndef _CPP_BITS_BASICIOS_TCC 31#define _CPP_BITS_BASICIOS_TCC 1 32 33#pragma GCC system_header 34 35namespace std 36{ 37 template<typename _CharT, typename _Traits> 38 void 39 basic_ios<_CharT, _Traits>::clear(iostate __state) 40 { 41 if (this->rdbuf()) 42 _M_streambuf_state = __state; 43 else 44 _M_streambuf_state = __state | badbit; 45 if ((this->rdstate() & this->exceptions())) 46 __throw_ios_failure("basic_ios::clear(iostate) caused exception"); 47 } 48 49 template<typename _CharT, typename _Traits> 50 basic_streambuf<_CharT, _Traits>* 51 basic_ios<_CharT, _Traits>::rdbuf(basic_streambuf<_CharT, _Traits>* __sb) 52 { 53 basic_streambuf<_CharT, _Traits>* __old = _M_streambuf; 54 _M_streambuf = __sb; 55 this->clear(); 56 return __old; 57 } 58 59 template<typename _CharT, typename _Traits> 60 basic_ios<_CharT, _Traits>& 61 basic_ios<_CharT, _Traits>::copyfmt(const basic_ios& __rhs) 62 { 63 // Per 27.1.1.1, do not call imbue, yet must trash all caches 64 // associated with imbue() 65 66 // Alloc any new word array first, so if it fails we have "rollback". 67 _Words* __words = (__rhs._M_word_size <= _S_local_word_size) ? 68 _M_local_word : new _Words[__rhs._M_word_size]; 69 70 // Bump refs before doing callbacks, for safety. 71 _Callback_list* __cb = __rhs._M_callbacks; 72 if (__cb) 73 __cb->_M_add_reference(); 74 _M_call_callbacks(erase_event); 75 if (_M_word != _M_local_word) 76 { 77 delete [] _M_word; 78 _M_word = 0; 79 } 80 _M_dispose_callbacks(); 81 82 _M_callbacks = __cb; // NB: Don't want any added during above. 83 for (int __i = 0; __i < __rhs._M_word_size; ++__i) 84 __words[__i] = __rhs._M_word[__i]; 85 if (_M_word != _M_local_word) 86 { 87 delete [] _M_word; 88 _M_word = 0; 89 } 90 _M_word = __words; 91 _M_word_size = __rhs._M_word_size; 92 93 this->flags(__rhs.flags()); 94 this->width(__rhs.width()); 95 this->precision(__rhs.precision()); 96 this->tie(__rhs.tie()); 97 this->fill(__rhs.fill()); 98 // The next is required to be the last assignment. 99 this->exceptions(__rhs.exceptions()); 100 101 _M_call_callbacks(copyfmt_event); 102 return *this; 103 } 104 105 template<typename _CharT, typename _Traits> 106 char 107 basic_ios<_CharT, _Traits>::narrow(char_type __c, char __dfault) const 108 { 109 char __ret = __dfault; 110 if (_M_check_facet(_M_fctype)) 111 __ret = _M_fctype->narrow(__c, __dfault); 112 return __ret; 113 } 114 115 template<typename _CharT, typename _Traits> 116 _CharT 117 basic_ios<_CharT, _Traits>::widen(char __c) const 118 { 119 char_type __ret = char_type(); 120 if (_M_check_facet(_M_fctype)) 121 __ret = _M_fctype->widen(__c); 122 return __ret; 123 } 124 125 // Locales: 126 template<typename _CharT, typename _Traits> 127 locale 128 basic_ios<_CharT, _Traits>::imbue(const locale& __loc) 129 { 130 locale __old(this->getloc()); 131 ios_base::imbue(__loc); 132 _M_cache_facets(__loc); 133 if (this->rdbuf() != 0) 134 this->rdbuf()->pubimbue(__loc); 135 return __old; 136 } 137 138 template<typename _CharT, typename _Traits> 139 void 140 basic_ios<_CharT, _Traits>::init(basic_streambuf<_CharT, _Traits>* __sb) 141 { 142 // NB: This may be called more than once on the same object. 143 ios_base::_M_init(); 144 _M_cache_facets(_M_ios_locale); 145 _M_tie = 0; 146 147 // NB: The 27.4.4.1 Postconditions Table specifies requirements 148 // after basic_ios::init() has been called. As part of this, 149 // fill() must return widen(' ') any time after init() has been 150 // called, which needs an imbued ctype facet of char_type to 151 // return without throwing an exception. Unfortunately, 152 // ctype<char_type> is not necessarily a required facet, so 153 // streams with char_type != [char, wchar_t] will not have it by 154 // default. Because of this, the correct value for _M_fill is 155 // constructed on the first call of fill(). That way, 156 // unformatted input and output with non-required basic_ios 157 // instantiations is possible even without imbuing the expected 158 // ctype<char_type> facet. 159 _M_fill = _CharT(); 160 _M_fill_init = false; 161 162 _M_exception = goodbit; 163 _M_streambuf = __sb; 164 _M_streambuf_state = __sb ? goodbit : badbit; 165 } 166 167 template<typename _CharT, typename _Traits> 168 void 169 basic_ios<_CharT, _Traits>::_M_cache_facets(const locale& __loc) 170 { 171 if (has_facet<__ctype_type>(__loc)) 172 _M_fctype = &use_facet<__ctype_type>(__loc); 173 else 174 _M_fctype = 0; 175 // Should be filled in by ostream and istream, respectively. 176 if (has_facet<__numput_type>(__loc)) 177 _M_fnumput = &use_facet<__numput_type>(__loc); 178 else 179 _M_fnumput = 0; 180 if (has_facet<__numget_type>(__loc)) 181 _M_fnumget = &use_facet<__numget_type>(__loc); 182 else 183 _M_fnumget = 0; 184 } 185 186 // Inhibit implicit instantiations for required instantiations, 187 // which are defined via explicit instantiations elsewhere. 188 // NB: This syntax is a GNU extension. 189 extern template class basic_ios<char>; 190 191#ifdef _GLIBCPP_USE_WCHAR_T 192 extern template class basic_ios<wchar_t>; 193#endif 194} // namespace std 195 196#endif 197