1 // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
2 // (C) Copyright 2003-2007 Jonathan Turkanis
3 // Distributed under the Boost Software License, Version 1.0. (See accompanying
4 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
5
6 // See http://www.boost.org/libs/iostreams for documentation.
7
8 #ifndef BOOST_IOSTREAMS_CLOSE_HPP_INCLUDED
9 #define BOOST_IOSTREAMS_CLOSE_HPP_INCLUDED
10
11 #if defined(_MSC_VER) && (_MSC_VER >= 1020)
12 # pragma once
13 #endif
14
15 #include <boost/config.hpp> // DEDUCED_TYPENAME, MSVC.
16 #include <boost/detail/workaround.hpp>
17 #include <boost/iostreams/categories.hpp>
18 #include <boost/iostreams/flush.hpp>
19 #include <boost/iostreams/detail/adapter/non_blocking_adapter.hpp>
20 #include <boost/iostreams/detail/ios.hpp> // BOOST_IOS
21 #include <boost/iostreams/detail/select.hpp>
22 #include <boost/iostreams/detail/wrap_unwrap.hpp>
23 #include <boost/iostreams/operations_fwd.hpp>
24 #include <boost/iostreams/traits.hpp>
25 #include <boost/mpl/identity.hpp>
26 #include <boost/mpl/if.hpp>
27 #include <boost/type_traits/is_convertible.hpp>
28 #include <boost/type_traits/is_integral.hpp>
29 #include <boost/type_traits/remove_cv.hpp>
30 #include <boost/type_traits/remove_reference.hpp>
31
32 // Must come last.
33 #include <boost/iostreams/detail/config/disable_warnings.hpp>
34
35 namespace pdalboost { namespace iostreams {
36
37 template<typename T>
38 void close(T& t);
39
40 template<typename T>
41 void close(T& t, BOOST_IOS::openmode which);
42
43 template<typename T, typename Sink>
44 void close(T& t, Sink& snk, BOOST_IOS::openmode which);
45
46 namespace detail {
47
48 template<typename T>
close_all(T & t)49 void close_all(T& t)
50 {
51 try {
52 pdalboost::iostreams::close(t, BOOST_IOS::in);
53 } catch (...) {
54 try {
55 pdalboost::iostreams::close(t, BOOST_IOS::out);
56 } catch (...) { }
57 throw;
58 }
59 pdalboost::iostreams::close(t, BOOST_IOS::out);
60 }
61
62 template<typename T, typename Sink>
close_all(T & t,Sink & snk)63 void close_all(T& t, Sink& snk)
64 {
65 try {
66 pdalboost::iostreams::close(t, snk, BOOST_IOS::in);
67 } catch (...) {
68 try {
69 pdalboost::iostreams::close(t, snk, BOOST_IOS::out);
70 } catch (...) { }
71 throw;
72 }
73 pdalboost::iostreams::close(t, snk, BOOST_IOS::out);
74 }
75
76 } // End namespace detail.
77
78 } } // End namespaces iostreams, boost.
79
80 #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) //-----------------------------------//
81 # include <boost/iostreams/detail/vc6/close.hpp>
82 #else // #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) //--------------------------//
83
84 namespace pdalboost { namespace iostreams {
85
86 namespace detail {
87
88 template<typename T>
89 struct close_impl;
90
91 } // End namespace detail.
92
93 template<typename T>
close(T & t)94 void close(T& t) { detail::close_all(t); }
95
96 template<typename T>
close(T & t,BOOST_IOS::openmode which)97 void close(T& t, BOOST_IOS::openmode which)
98 {
99 #ifdef BOOST_IOSTREAMS_STRICT
100 BOOST_ASSERT(which == BOOST_IOS::in || which == BOOST_IOS::out);
101 #else
102 if (which == (BOOST_IOS::in | BOOST_IOS::out)) {
103 detail::close_all(t);
104 return;
105 }
106 #endif
107 detail::close_impl<T>::close(detail::unwrap(t), which);
108 }
109
110 template<typename T, typename Sink>
close(T & t,Sink & snk,BOOST_IOS::openmode which)111 void close(T& t, Sink& snk, BOOST_IOS::openmode which)
112 {
113 #ifdef BOOST_IOSTREAMS_STRICT
114 BOOST_ASSERT(which == BOOST_IOS::in || which == BOOST_IOS::out);
115 #else
116 if (which == (BOOST_IOS::in | BOOST_IOS::out)) {
117 detail::close_all(t, snk);
118 return;
119 }
120 #endif
121 detail::close_impl<T>::close(detail::unwrap(t), snk, which);
122 }
123
124 namespace detail {
125
126 //------------------Definition of close_impl----------------------------------//
127
128 struct close_boost_stream { };
129 struct close_filtering_stream { };
130
131 template<typename T>
132 struct close_tag {
133 typedef typename category_of<T>::type category;
134 typedef typename detail::unwrapped_type<T>::type unwrapped;
135 typedef typename
136 iostreams::select<
137 mpl::not_< is_convertible<category, closable_tag> >,
138 any_tag,
139 mpl::or_<
140 is_boost_stream<unwrapped>,
141 is_boost_stream_buffer<unwrapped>
142 >,
143 close_boost_stream,
144 mpl::or_<
145 is_filtering_stream<unwrapped>,
146 is_filtering_streambuf<unwrapped>
147 >,
148 close_filtering_stream,
149 mpl::or_<
150 is_convertible<category, two_sequence>,
151 is_convertible<category, dual_use>
152 >,
153 two_sequence,
154 else_,
155 closable_tag
156 >::type type;
157 };
158
159 template<typename T>
160 struct close_impl
161 : mpl::if_<
162 is_custom<T>,
163 operations<T>,
164 close_impl<BOOST_DEDUCED_TYPENAME close_tag<T>::type>
165 >::type
166 { };
167
168 template<>
169 struct close_impl<any_tag> {
170 template<typename T>
closepdalboost::iostreams::detail::close_impl171 static void close(T& t, BOOST_IOS::openmode which)
172 {
173 if (which == BOOST_IOS::out)
174 iostreams::flush(t);
175 }
176
177 template<typename T, typename Sink>
closepdalboost::iostreams::detail::close_impl178 static void close(T& t, Sink& snk, BOOST_IOS::openmode which)
179 {
180 if (which == BOOST_IOS::out) {
181 non_blocking_adapter<Sink> nb(snk);
182 iostreams::flush(t, nb);
183 }
184 }
185 };
186
187 template<>
188 struct close_impl<close_boost_stream> {
189 template<typename T>
closepdalboost::iostreams::detail::close_impl190 static void close(T& t)
191 {
192 t.close();
193 }
194 template<typename T>
closepdalboost::iostreams::detail::close_impl195 static void close(T& t, BOOST_IOS::openmode which)
196 {
197 if (which == BOOST_IOS::out)
198 t.close();
199 }
200 };
201
202 template<>
203 struct close_impl<close_filtering_stream> {
204 template<typename T>
closepdalboost::iostreams::detail::close_impl205 static void close(T& t, BOOST_IOS::openmode which)
206 {
207 typedef typename category_of<T>::type category;
208 const bool in = is_convertible<category, input>::value &&
209 !is_convertible<category, output>::value;
210 if (in == (which == BOOST_IOS::in) && t.is_complete())
211 t.pop();
212 }
213 };
214
215 template<>
216 struct close_impl<closable_tag> {
217 template<typename T>
closepdalboost::iostreams::detail::close_impl218 static void close(T& t, BOOST_IOS::openmode which)
219 {
220 typedef typename category_of<T>::type category;
221 const bool in = is_convertible<category, input>::value &&
222 !is_convertible<category, output>::value;
223 if (in == (which == BOOST_IOS::in))
224 t.close();
225 }
226 template<typename T, typename Sink>
closepdalboost::iostreams::detail::close_impl227 static void close(T& t, Sink& snk, BOOST_IOS::openmode which)
228 {
229 typedef typename category_of<T>::type category;
230 const bool in = is_convertible<category, input>::value &&
231 !is_convertible<category, output>::value;
232 if (in == (which == BOOST_IOS::in)) {
233 non_blocking_adapter<Sink> nb(snk);
234 t.close(nb);
235 }
236 }
237 };
238
239 template<>
240 struct close_impl<two_sequence> {
241 template<typename T>
closepdalboost::iostreams::detail::close_impl242 static void close(T& t, BOOST_IOS::openmode which) { t.close(which); }
243 template<typename T, typename Sink>
closepdalboost::iostreams::detail::close_impl244 static void close(T& t, Sink& snk, BOOST_IOS::openmode which)
245 {
246 non_blocking_adapter<Sink> nb(snk);
247 t.close(nb, which);
248 }
249 };
250
251 } // End namespace detail.
252
253 } } // End namespaces iostreams, boost.
254
255 #endif // #if BOOST_WORKAROUND(BOOST_MSVC, < 1300) //-------------------------//
256
257 #include <boost/iostreams/detail/config/enable_warnings.hpp>
258
259 #endif // #ifndef BOOST_IOSTREAMS_CLOSE_HPP_INCLUDED
260