1// basic_ios member functions -*- C++ -*- 
2 
3// Copyright (C) 1999-2019 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 
35namespace 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