1 | // basic_ios member functions -*- C++ -*- |
2 | |
3 | // Copyright (C) 1999-2017 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 | |