1 // basic_ios member functions -*- C++ -*- 2 3 // Copyright (C) 1999-2018 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 3, 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 // Under Section 7 of GPL version 3, you are granted additional 17 // permissions described in the GCC Runtime Library Exception, version 18 // 3.1, as published by the Free Software Foundation. 19 20 // You should have received a copy of the GNU General Public License and 21 // a copy of the GCC Runtime Library Exception along with this program; 22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 23 // <http://www.gnu.org/licenses/>. 24 25 /** @file bits/basic_ios.tcc 26 * This is an internal header file, included by other library headers. 27 * Do not attempt to use it directly. @headername{ios} 28 */ 29 30 #ifndef _BASIC_IOS_TCC 31 #define _BASIC_IOS_TCC 1 32 33 #pragma GCC system_header 34 35 namespace std _GLIBCXX_VISIBILITY(default) 36 { 37 _GLIBCXX_BEGIN_NAMESPACE_VERSION 38 39 template<typename _CharT, typename _Traits> 40 void 41 basic_ios<_CharT, _Traits>::clear(iostate __state) 42 { 43 if (this->rdbuf()) 44 _M_streambuf_state = __state; 45 else 46 _M_streambuf_state = __state | badbit; 47 if (this->exceptions() & this->rdstate()) 48 __throw_ios_failure(__N("basic_ios::clear")); 49 } 50 51 template<typename _CharT, typename _Traits> 52 basic_streambuf<_CharT, _Traits>* 53 basic_ios<_CharT, _Traits>::rdbuf(basic_streambuf<_CharT, _Traits>* __sb) 54 { 55 basic_streambuf<_CharT, _Traits>* __old = _M_streambuf; 56 _M_streambuf = __sb; 57 this->clear(); 58 return __old; 59 } 60 61 template<typename _CharT, typename _Traits> 62 basic_ios<_CharT, _Traits>& 63 basic_ios<_CharT, _Traits>::copyfmt(const basic_ios& __rhs) 64 { 65 // _GLIBCXX_RESOLVE_LIB_DEFECTS 66 // 292. effects of a.copyfmt (a) 67 if (this != &__rhs) 68 { 69 // Per 27.1.1, do not call imbue, yet must trash all caches 70 // associated with imbue() 71 72 // Alloc any new word array first, so if it fails we have "rollback". 73 _Words* __words = (__rhs._M_word_size <= _S_local_word_size) ? 74 _M_local_word : new _Words[__rhs._M_word_size]; 75 76 // Bump refs before doing callbacks, for safety. 77 _Callback_list* __cb = __rhs._M_callbacks; 78 if (__cb) 79 __cb->_M_add_reference(); 80 _M_call_callbacks(erase_event); 81 if (_M_word != _M_local_word) 82 { 83 delete [] _M_word; 84 _M_word = 0; 85 } 86 _M_dispose_callbacks(); 87 88 // NB: Don't want any added during above. 89 _M_callbacks = __cb; 90 for (int __i = 0; __i < __rhs._M_word_size; ++__i) 91 __words[__i] = __rhs._M_word[__i]; 92 _M_word = __words; 93 _M_word_size = __rhs._M_word_size; 94 95 this->flags(__rhs.flags()); 96 this->width(__rhs.width()); 97 this->precision(__rhs.precision()); 98 this->tie(__rhs.tie()); 99 this->fill(__rhs.fill()); 100 _M_ios_locale = __rhs.getloc(); 101 _M_cache_locale(_M_ios_locale); 102 103 _M_call_callbacks(copyfmt_event); 104 105 // The next is required to be the last assignment. 106 this->exceptions(__rhs.exceptions()); 107 } 108 return *this; 109 } 110 111 // Locales: 112 template<typename _CharT, typename _Traits> 113 locale 114 basic_ios<_CharT, _Traits>::imbue(const locale& __loc) 115 { 116 locale __old(this->getloc()); 117 ios_base::imbue(__loc); 118 _M_cache_locale(__loc); 119 if (this->rdbuf() != 0) 120 this->rdbuf()->pubimbue(__loc); 121 return __old; 122 } 123 124 template<typename _CharT, typename _Traits> 125 void 126 basic_ios<_CharT, _Traits>::init(basic_streambuf<_CharT, _Traits>* __sb) 127 { 128 // NB: This may be called more than once on the same object. 129 ios_base::_M_init(); 130 131 // Cache locale data and specific facets used by iostreams. 132 _M_cache_locale(_M_ios_locale); 133 134 // NB: The 27.4.4.1 Postconditions Table specifies requirements 135 // after basic_ios::init() has been called. As part of this, 136 // fill() must return widen(' ') any time after init() has been 137 // called, which needs an imbued ctype facet of char_type to 138 // return without throwing an exception. Unfortunately, 139 // ctype<char_type> is not necessarily a required facet, so 140 // streams with char_type != [char, wchar_t] will not have it by 141 // default. Because of this, the correct value for _M_fill is 142 // constructed on the first call of fill(). That way, 143 // unformatted input and output with non-required basic_ios 144 // instantiations is possible even without imbuing the expected 145 // ctype<char_type> facet. 146 _M_fill = _CharT(); 147 _M_fill_init = false; 148 149 _M_tie = 0; 150 _M_exception = goodbit; 151 _M_streambuf = __sb; 152 _M_streambuf_state = __sb ? goodbit : badbit; 153 } 154 155 template<typename _CharT, typename _Traits> 156 void 157 basic_ios<_CharT, _Traits>::_M_cache_locale(const locale& __loc) 158 { 159 if (__builtin_expect(has_facet<__ctype_type>(__loc), true)) 160 _M_ctype = std::__addressof(use_facet<__ctype_type>(__loc)); 161 else 162 _M_ctype = 0; 163 164 if (__builtin_expect(has_facet<__num_put_type>(__loc), true)) 165 _M_num_put = std::__addressof(use_facet<__num_put_type>(__loc)); 166 else 167 _M_num_put = 0; 168 169 if (__builtin_expect(has_facet<__num_get_type>(__loc), true)) 170 _M_num_get = std::__addressof(use_facet<__num_get_type>(__loc)); 171 else 172 _M_num_get = 0; 173 } 174 175 // Inhibit implicit instantiations for required instantiations, 176 // which are defined via explicit instantiations elsewhere. 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_VERSION 186 } // namespace std 187 188 #endif 189