basic_ios.tcc

00001 // basic_ios member functions -*- C++ -*- 00002 00003 // Copyright (C) 1999, 2001, 2002, 2003 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 _BASIC_IOS_TCC 00031 #define _BASIC_IOS_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->exceptions() & this->rdstate()) 00046 __throw_ios_failure(__N("basic_ios::clear")); 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 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00064 // 292. effects of a.copyfmt (a) 00065 if (this != &__rhs) 00066 { 00067 // Per 27.1.1, do not call imbue, yet must trash all caches 00068 // associated with imbue() 00069 00070 // Alloc any new word array first, so if it fails we have "rollback". 00071 _Words* __words = (__rhs._M_word_size <= _S_local_word_size) ? 00072 _M_local_word : new _Words[__rhs._M_word_size]; 00073 00074 // Bump refs before doing callbacks, for safety. 00075 _Callback_list* __cb = __rhs._M_callbacks; 00076 if (__cb) 00077 __cb->_M_add_reference(); 00078 _M_call_callbacks(erase_event); 00079 if (_M_word != _M_local_word) 00080 { 00081 delete [] _M_word; 00082 _M_word = 0; 00083 } 00084 _M_dispose_callbacks(); 00085 00086 // NB: Don't want any added during above. 00087 _M_callbacks = __cb; 00088 for (int __i = 0; __i < __rhs._M_word_size; ++__i) 00089 __words[__i] = __rhs._M_word[__i]; 00090 if (_M_word != _M_local_word) 00091 { 00092 delete [] _M_word; 00093 _M_word = 0; 00094 } 00095 _M_word = __words; 00096 _M_word_size = __rhs._M_word_size; 00097 00098 this->flags(__rhs.flags()); 00099 this->width(__rhs.width()); 00100 this->precision(__rhs.precision()); 00101 this->tie(__rhs.tie()); 00102 this->fill(__rhs.fill()); 00103 _M_ios_locale = __rhs.getloc(); 00104 _M_cache_locale(_M_ios_locale); 00105 00106 _M_call_callbacks(copyfmt_event); 00107 00108 // The next is required to be the last assignment. 00109 this->exceptions(__rhs.exceptions()); 00110 } 00111 return *this; 00112 } 00113 00114 template<typename _CharT, typename _Traits> 00115 char 00116 basic_ios<_CharT, _Traits>::narrow(char_type __c, char __dfault) const 00117 { return __check_facet(_M_ctype).narrow(__c, __dfault); } 00118 00119 template<typename _CharT, typename _Traits> 00120 _CharT 00121 basic_ios<_CharT, _Traits>::widen(char __c) const 00122 { return __check_facet(_M_ctype).widen(__c); } 00123 00124 // Locales: 00125 template<typename _CharT, typename _Traits> 00126 locale 00127 basic_ios<_CharT, _Traits>::imbue(const locale& __loc) 00128 { 00129 locale __old(this->getloc()); 00130 ios_base::imbue(__loc); 00131 _M_cache_locale(__loc); 00132 if (this->rdbuf() != 0) 00133 this->rdbuf()->pubimbue(__loc); 00134 return __old; 00135 } 00136 00137 template<typename _CharT, typename _Traits> 00138 void 00139 basic_ios<_CharT, _Traits>::init(basic_streambuf<_CharT, _Traits>* __sb) 00140 { 00141 // NB: This may be called more than once on the same object. 00142 ios_base::_M_init(); 00143 00144 // Cache locale data and specific facets used by iostreams. 00145 _M_cache_locale(_M_ios_locale); 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_tie = 0; 00163 _M_exception = goodbit; 00164 _M_streambuf = __sb; 00165 _M_streambuf_state = __sb ? goodbit : badbit; 00166 } 00167 00168 template<typename _CharT, typename _Traits> 00169 void 00170 basic_ios<_CharT, _Traits>::_M_cache_locale(const locale& __loc) 00171 { 00172 if (__builtin_expect(has_facet<__ctype_type>(__loc), true)) 00173 _M_ctype = &use_facet<__ctype_type>(__loc); 00174 else 00175 _M_ctype = 0; 00176 00177 if (__builtin_expect(has_facet<__num_put_type>(__loc), true)) 00178 _M_num_put = &use_facet<__num_put_type>(__loc); 00179 else 00180 _M_num_put = 0; 00181 00182 if (__builtin_expect(has_facet<__num_get_type>(__loc), true)) 00183 _M_num_get = &use_facet<__num_get_type>(__loc); 00184 else 00185 _M_num_get = 0; 00186 } 00187 00188 // Inhibit implicit instantiations for required instantiations, 00189 // which are defined via explicit instantiations elsewhere. 00190 // NB: This syntax is a GNU extension. 00191 #if _GLIBCXX_EXTERN_TEMPLATE 00192 extern template class basic_ios<char>; 00193 00194 #ifdef _GLIBCXX_USE_WCHAR_T 00195 extern template class basic_ios<wchar_t>; 00196 #endif 00197 #endif 00198 } // namespace std 00199 00200 #endif

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