1 // basic_ios member functions -*- C++ -*- 2 3 // Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 4 // 2009 Free Software Foundation, Inc. 5 // 6 // This file is part of the GNU ISO C++ Library. This library is free 7 // software; you can redistribute it and/or modify it under the 8 // terms of the GNU General Public License as published by the 9 // Free Software Foundation; either version 3, or (at your option) 10 // any later version. 11 12 // This library is distributed in the hope that it will be useful, 13 // but WITHOUT ANY WARRANTY; without even the implied warranty of 14 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 // GNU General Public License for more details. 16 17 // Under Section 7 of GPL version 3, you are granted additional 18 // permissions described in the GCC Runtime Library Exception, version 19 // 3.1, as published by the Free Software Foundation. 20 21 // You should have received a copy of the GNU General Public License and 22 // a copy of the GCC Runtime Library Exception along with this program; 23 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 24 // <http://www.gnu.org/licenses/>. 25 26 /** @file basic_ios.tcc 27 * This is an internal header file, included by other library headers. 28 * You should not attempt to use it directly. 29 */ 30 31 #ifndef _BASIC_IOS_TCC 32 #define _BASIC_IOS_TCC 1 33 34 #pragma GCC system_header 35 36 _GLIBCXX_BEGIN_NAMESPACE(std) 37 38 template<typename _CharT, typename _Traits> 39 void 40 basic_ios<_CharT, _Traits>::clear(iostate __state) 41 { 42 if (this->rdbuf()) 43 _M_streambuf_state = __state; 44 else 45 _M_streambuf_state = __state | badbit; 46 if (this->exceptions() & this->rdstate()) 47 __throw_ios_failure(__N("basic_ios::clear")); 48 } 49 50 template<typename _CharT, typename _Traits> 51 basic_streambuf<_CharT, _Traits>* 52 basic_ios<_CharT, _Traits>::rdbuf(basic_streambuf<_CharT, _Traits>* __sb) 53 { 54 basic_streambuf<_CharT, _Traits>* __old = _M_streambuf; 55 _M_streambuf = __sb; 56 this->clear(); 57 return __old; 58 } 59 60 template<typename _CharT, typename _Traits> 61 basic_ios<_CharT, _Traits>& 62 basic_ios<_CharT, _Traits>::copyfmt(const basic_ios& __rhs) 63 { 64 // _GLIBCXX_RESOLVE_LIB_DEFECTS 65 // 292. effects of a.copyfmt (a) 66 if (this != &__rhs) 67 { 68 // Per 27.1.1, do not call imbue, yet must trash all caches 69 // associated with imbue() 70 71 // Alloc any new word array first, so if it fails we have "rollback". 72 _Words* __words = (__rhs._M_word_size <= _S_local_word_size) ? 73 _M_local_word : new _Words[__rhs._M_word_size]; 74 75 // Bump refs before doing callbacks, for safety. 76 _Callback_list* __cb = __rhs._M_callbacks; 77 if (__cb) 78 __cb->_M_add_reference(); 79 _M_call_callbacks(erase_event); 80 if (_M_word != _M_local_word) 81 { 82 delete [] _M_word; 83 _M_word = 0; 84 } 85 _M_dispose_callbacks(); 86 87 // NB: Don't want any added during above. 88 _M_callbacks = __cb; 89 for (int __i = 0; __i < __rhs._M_word_size; ++__i) 90 __words[__i] = __rhs._M_word[__i]; 91 _M_word = __words; 92 _M_word_size = __rhs._M_word_size; 93 94 this->flags(__rhs.flags()); 95 this->width(__rhs.width()); 96 this->precision(__rhs.precision()); 97 this->tie(__rhs.tie()); 98 this->fill(__rhs.fill()); 99 _M_ios_locale = __rhs.getloc(); 100 _M_cache_locale(_M_ios_locale); 101 102 _M_call_callbacks(copyfmt_event); 103 104 // The next is required to be the last assignment. 105 this->exceptions(__rhs.exceptions()); 106 } 107 return *this; 108 } 109 110 // Locales: 111 template<typename _CharT, typename _Traits> 112 locale 113 basic_ios<_CharT, _Traits>::imbue(const locale& __loc) 114 { 115 locale __old(this->getloc()); 116 ios_base::imbue(__loc); 117 _M_cache_locale(__loc); 118 if (this->rdbuf() != 0) 119 this->rdbuf()->pubimbue(__loc); 120 return __old; 121 } 122 123 template<typename _CharT, typename _Traits> 124 void 125 basic_ios<_CharT, _Traits>::init(basic_streambuf<_CharT, _Traits>* __sb) 126 { 127 // NB: This may be called more than once on the same object. 128 ios_base::_M_init(); 129 130 // Cache locale data and specific facets used by iostreams. 131 _M_cache_locale(_M_ios_locale); 132 133 // NB: The 27.4.4.1 Postconditions Table specifies requirements 134 // after basic_ios::init() has been called. As part of this, 135 // fill() must return widen(' ') any time after init() has been 136 // called, which needs an imbued ctype facet of char_type to 137 // return without throwing an exception. Unfortunately, 138 // ctype<char_type> is not necessarily a required facet, so 139 // streams with char_type != [char, wchar_t] will not have it by 140 // default. Because of this, the correct value for _M_fill is 141 // constructed on the first call of fill(). That way, 142 // unformatted input and output with non-required basic_ios 143 // instantiations is possible even without imbuing the expected 144 // ctype<char_type> facet. 145 _M_fill = _CharT(); 146 _M_fill_init = false; 147 148 _M_tie = 0; 149 _M_exception = goodbit; 150 _M_streambuf = __sb; 151 _M_streambuf_state = __sb ? goodbit : badbit; 152 } 153 154 template<typename _CharT, typename _Traits> 155 void 156 basic_ios<_CharT, _Traits>::_M_cache_locale(const locale& __loc) 157 { 158 if (__builtin_expect(has_facet<__ctype_type>(__loc), true)) 159 _M_ctype = &use_facet<__ctype_type>(__loc); 160 else 161 _M_ctype = 0; 162 163 if (__builtin_expect(has_facet<__num_put_type>(__loc), true)) 164 _M_num_put = &use_facet<__num_put_type>(__loc); 165 else 166 _M_num_put = 0; 167 168 if (__builtin_expect(has_facet<__num_get_type>(__loc), true)) 169 _M_num_get = &use_facet<__num_get_type>(__loc); 170 else 171 _M_num_get = 0; 172 } 173 174 // Inhibit implicit instantiations for required instantiations, 175 // which are defined via explicit instantiations elsewhere. 176 // NB: This syntax is a GNU extension. 177 #if _GLIBCXX_EXTERN_TEMPLATE 178 extern template class basic_ios<char>; 179 180 #ifdef _GLIBCXX_USE_WCHAR_T 181 extern template class basic_ios<wchar_t>; 182 #endif 183 #endif 184 185 _GLIBCXX_END_NAMESPACE 186 187 #endif 188