libstdc++
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00001 // basic_ios member functions -*- C++ -*- 00002 00003 // Copyright (C) 1999-2015 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 3, 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 // Under Section 7 of GPL version 3, you are granted additional 00017 // permissions described in the GCC Runtime Library Exception, version 00018 // 3.1, as published by the Free Software Foundation. 00019 00020 // You should have received a copy of the GNU General Public License and 00021 // a copy of the GCC Runtime Library Exception along with this program; 00022 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00023 // <http://www.gnu.org/licenses/>. 00024 00025 /** @file bits/basic_ios.tcc 00026 * This is an internal header file, included by other library headers. 00027 * Do not attempt to use it directly. @headername{ios} 00028 */ 00029 00030 #ifndef _BASIC_IOS_TCC 00031 #define _BASIC_IOS_TCC 1 00032 00033 #pragma GCC system_header 00034 00035 namespace std _GLIBCXX_VISIBILITY(default) 00036 { 00037 _GLIBCXX_BEGIN_NAMESPACE_VERSION 00038 00039 template<typename _CharT, typename _Traits> 00040 void 00041 basic_ios<_CharT, _Traits>::clear(iostate __state) 00042 { 00043 if (this->rdbuf()) 00044 _M_streambuf_state = __state; 00045 else 00046 _M_streambuf_state = __state | badbit; 00047 if (this->exceptions() & this->rdstate()) 00048 __throw_ios_failure(__N("basic_ios::clear")); 00049 } 00050 00051 template<typename _CharT, typename _Traits> 00052 basic_streambuf<_CharT, _Traits>* 00053 basic_ios<_CharT, _Traits>::rdbuf(basic_streambuf<_CharT, _Traits>* __sb) 00054 { 00055 basic_streambuf<_CharT, _Traits>* __old = _M_streambuf; 00056 _M_streambuf = __sb; 00057 this->clear(); 00058 return __old; 00059 } 00060 00061 template<typename _CharT, typename _Traits> 00062 basic_ios<_CharT, _Traits>& 00063 basic_ios<_CharT, _Traits>::copyfmt(const basic_ios& __rhs) 00064 { 00065 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00066 // 292. effects of a.copyfmt (a) 00067 if (this != &__rhs) 00068 { 00069 // Per 27.1.1, do not call imbue, yet must trash all caches 00070 // associated with imbue() 00071 00072 // Alloc any new word array first, so if it fails we have "rollback". 00073 _Words* __words = (__rhs._M_word_size <= _S_local_word_size) ? 00074 _M_local_word : new _Words[__rhs._M_word_size]; 00075 00076 // Bump refs before doing callbacks, for safety. 00077 _Callback_list* __cb = __rhs._M_callbacks; 00078 if (__cb) 00079 __cb->_M_add_reference(); 00080 _M_call_callbacks(erase_event); 00081 if (_M_word != _M_local_word) 00082 { 00083 delete [] _M_word; 00084 _M_word = 0; 00085 } 00086 _M_dispose_callbacks(); 00087 00088 // NB: Don't want any added during above. 00089 _M_callbacks = __cb; 00090 for (int __i = 0; __i < __rhs._M_word_size; ++__i) 00091 __words[__i] = __rhs._M_word[__i]; 00092 _M_word = __words; 00093 _M_word_size = __rhs._M_word_size; 00094 00095 this->flags(__rhs.flags()); 00096 this->width(__rhs.width()); 00097 this->precision(__rhs.precision()); 00098 this->tie(__rhs.tie()); 00099 this->fill(__rhs.fill()); 00100 _M_ios_locale = __rhs.getloc(); 00101 _M_cache_locale(_M_ios_locale); 00102 00103 _M_call_callbacks(copyfmt_event); 00104 00105 // The next is required to be the last assignment. 00106 this->exceptions(__rhs.exceptions()); 00107 } 00108 return *this; 00109 } 00110 00111 // Locales: 00112 template<typename _CharT, typename _Traits> 00113 locale 00114 basic_ios<_CharT, _Traits>::imbue(const locale& __loc) 00115 { 00116 locale __old(this->getloc()); 00117 ios_base::imbue(__loc); 00118 _M_cache_locale(__loc); 00119 if (this->rdbuf() != 0) 00120 this->rdbuf()->pubimbue(__loc); 00121 return __old; 00122 } 00123 00124 template<typename _CharT, typename _Traits> 00125 void 00126 basic_ios<_CharT, _Traits>::init(basic_streambuf<_CharT, _Traits>* __sb) 00127 { 00128 // NB: This may be called more than once on the same object. 00129 ios_base::_M_init(); 00130 00131 // Cache locale data and specific facets used by iostreams. 00132 _M_cache_locale(_M_ios_locale); 00133 00134 // NB: The 27.4.4.1 Postconditions Table specifies requirements 00135 // after basic_ios::init() has been called. As part of this, 00136 // fill() must return widen(' ') any time after init() has been 00137 // called, which needs an imbued ctype facet of char_type to 00138 // return without throwing an exception. Unfortunately, 00139 // ctype<char_type> is not necessarily a required facet, so 00140 // streams with char_type != [char, wchar_t] will not have it by 00141 // default. Because of this, the correct value for _M_fill is 00142 // constructed on the first call of fill(). That way, 00143 // unformatted input and output with non-required basic_ios 00144 // instantiations is possible even without imbuing the expected 00145 // ctype<char_type> facet. 00146 _M_fill = _CharT(); 00147 _M_fill_init = false; 00148 00149 _M_tie = 0; 00150 _M_exception = goodbit; 00151 _M_streambuf = __sb; 00152 _M_streambuf_state = __sb ? goodbit : badbit; 00153 } 00154 00155 template<typename _CharT, typename _Traits> 00156 void 00157 basic_ios<_CharT, _Traits>::_M_cache_locale(const locale& __loc) 00158 { 00159 if (__builtin_expect(has_facet<__ctype_type>(__loc), true)) 00160 _M_ctype = &use_facet<__ctype_type>(__loc); 00161 else 00162 _M_ctype = 0; 00163 00164 if (__builtin_expect(has_facet<__num_put_type>(__loc), true)) 00165 _M_num_put = &use_facet<__num_put_type>(__loc); 00166 else 00167 _M_num_put = 0; 00168 00169 if (__builtin_expect(has_facet<__num_get_type>(__loc), true)) 00170 _M_num_get = &use_facet<__num_get_type>(__loc); 00171 else 00172 _M_num_get = 0; 00173 } 00174 00175 // Inhibit implicit instantiations for required instantiations, 00176 // which are defined via explicit instantiations elsewhere. 00177 #if _GLIBCXX_EXTERN_TEMPLATE 00178 extern template class basic_ios<char>; 00179 00180 #ifdef _GLIBCXX_USE_WCHAR_T 00181 extern template class basic_ios<wchar_t>; 00182 #endif 00183 #endif 00184 00185 _GLIBCXX_END_NAMESPACE_VERSION 00186 } // namespace std 00187 00188 #endif