libstdc++
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00001 // basic_ios member functions -*- C++ -*- 00002 00003 // Copyright (C) 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 00004 // 2009 Free Software Foundation, Inc. 00005 // 00006 // This file is part of the GNU ISO C++ Library. This library is free 00007 // software; you can redistribute it and/or modify it under the 00008 // terms of the GNU General Public License as published by the 00009 // Free Software Foundation; either version 3, or (at your option) 00010 // any later version. 00011 00012 // This library is distributed in the hope that it will be useful, 00013 // but WITHOUT ANY WARRANTY; without even the implied warranty of 00014 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00015 // GNU General Public License for more details. 00016 00017 // Under Section 7 of GPL version 3, you are granted additional 00018 // permissions described in the GCC Runtime Library Exception, version 00019 // 3.1, as published by the Free Software Foundation. 00020 00021 // You should have received a copy of the GNU General Public License and 00022 // a copy of the GCC Runtime Library Exception along with this program; 00023 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see 00024 // <http://www.gnu.org/licenses/>. 00025 00026 /** @file basic_ios.tcc 00027 * This is an internal header file, included by other library headers. 00028 * You should not attempt to use it directly. 00029 */ 00030 00031 #ifndef _BASIC_IOS_TCC 00032 #define _BASIC_IOS_TCC 1 00033 00034 #pragma GCC system_header 00035 00036 _GLIBCXX_BEGIN_NAMESPACE(std) 00037 00038 template<typename _CharT, typename _Traits> 00039 void 00040 basic_ios<_CharT, _Traits>::clear(iostate __state) 00041 { 00042 if (this->rdbuf()) 00043 _M_streambuf_state = __state; 00044 else 00045 _M_streambuf_state = __state | badbit; 00046 if (this->exceptions() & this->rdstate()) 00047 __throw_ios_failure(__N("basic_ios::clear")); 00048 } 00049 00050 template<typename _CharT, typename _Traits> 00051 basic_streambuf<_CharT, _Traits>* 00052 basic_ios<_CharT, _Traits>::rdbuf(basic_streambuf<_CharT, _Traits>* __sb) 00053 { 00054 basic_streambuf<_CharT, _Traits>* __old = _M_streambuf; 00055 _M_streambuf = __sb; 00056 this->clear(); 00057 return __old; 00058 } 00059 00060 template<typename _CharT, typename _Traits> 00061 basic_ios<_CharT, _Traits>& 00062 basic_ios<_CharT, _Traits>::copyfmt(const basic_ios& __rhs) 00063 { 00064 // _GLIBCXX_RESOLVE_LIB_DEFECTS 00065 // 292. effects of a.copyfmt (a) 00066 if (this != &__rhs) 00067 { 00068 // Per 27.1.1, do not call imbue, yet must trash all caches 00069 // associated with imbue() 00070 00071 // Alloc any new word array first, so if it fails we have "rollback". 00072 _Words* __words = (__rhs._M_word_size <= _S_local_word_size) ? 00073 _M_local_word : new _Words[__rhs._M_word_size]; 00074 00075 // Bump refs before doing callbacks, for safety. 00076 _Callback_list* __cb = __rhs._M_callbacks; 00077 if (__cb) 00078 __cb->_M_add_reference(); 00079 _M_call_callbacks(erase_event); 00080 if (_M_word != _M_local_word) 00081 { 00082 delete [] _M_word; 00083 _M_word = 0; 00084 } 00085 _M_dispose_callbacks(); 00086 00087 // NB: Don't want any added during above. 00088 _M_callbacks = __cb; 00089 for (int __i = 0; __i < __rhs._M_word_size; ++__i) 00090 __words[__i] = __rhs._M_word[__i]; 00091 _M_word = __words; 00092 _M_word_size = __rhs._M_word_size; 00093 00094 this->flags(__rhs.flags()); 00095 this->width(__rhs.width()); 00096 this->precision(__rhs.precision()); 00097 this->tie(__rhs.tie()); 00098 this->fill(__rhs.fill()); 00099 _M_ios_locale = __rhs.getloc(); 00100 _M_cache_locale(_M_ios_locale); 00101 00102 _M_call_callbacks(copyfmt_event); 00103 00104 // The next is required to be the last assignment. 00105 this->exceptions(__rhs.exceptions()); 00106 } 00107 return *this; 00108 } 00109 00110 // Locales: 00111 template<typename _CharT, typename _Traits> 00112 locale 00113 basic_ios<_CharT, _Traits>::imbue(const locale& __loc) 00114 { 00115 locale __old(this->getloc()); 00116 ios_base::imbue(__loc); 00117 _M_cache_locale(__loc); 00118 if (this->rdbuf() != 0) 00119 this->rdbuf()->pubimbue(__loc); 00120 return __old; 00121 } 00122 00123 template<typename _CharT, typename _Traits> 00124 void 00125 basic_ios<_CharT, _Traits>::init(basic_streambuf<_CharT, _Traits>* __sb) 00126 { 00127 // NB: This may be called more than once on the same object. 00128 ios_base::_M_init(); 00129 00130 // Cache locale data and specific facets used by iostreams. 00131 _M_cache_locale(_M_ios_locale); 00132 00133 // NB: The 27.4.4.1 Postconditions Table specifies requirements 00134 // after basic_ios::init() has been called. As part of this, 00135 // fill() must return widen(' ') any time after init() has been 00136 // called, which needs an imbued ctype facet of char_type to 00137 // return without throwing an exception. Unfortunately, 00138 // ctype<char_type> is not necessarily a required facet, so 00139 // streams with char_type != [char, wchar_t] will not have it by 00140 // default. Because of this, the correct value for _M_fill is 00141 // constructed on the first call of fill(). That way, 00142 // unformatted input and output with non-required basic_ios 00143 // instantiations is possible even without imbuing the expected 00144 // ctype<char_type> facet. 00145 _M_fill = _CharT(); 00146 _M_fill_init = false; 00147 00148 _M_tie = 0; 00149 _M_exception = goodbit; 00150 _M_streambuf = __sb; 00151 _M_streambuf_state = __sb ? goodbit : badbit; 00152 } 00153 00154 template<typename _CharT, typename _Traits> 00155 void 00156 basic_ios<_CharT, _Traits>::_M_cache_locale(const locale& __loc) 00157 { 00158 if (__builtin_expect(has_facet<__ctype_type>(__loc), true)) 00159 _M_ctype = &use_facet<__ctype_type>(__loc); 00160 else 00161 _M_ctype = 0; 00162 00163 if (__builtin_expect(has_facet<__num_put_type>(__loc), true)) 00164 _M_num_put = &use_facet<__num_put_type>(__loc); 00165 else 00166 _M_num_put = 0; 00167 00168 if (__builtin_expect(has_facet<__num_get_type>(__loc), true)) 00169 _M_num_get = &use_facet<__num_get_type>(__loc); 00170 else 00171 _M_num_get = 0; 00172 } 00173 00174 // Inhibit implicit instantiations for required instantiations, 00175 // which are defined via explicit instantiations elsewhere. 00176 // NB: This syntax is a GNU extension. 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 00186 00187 #endif