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_FLUSH_HPP_INCLUDED |
9 | #define BOOST_IOSTREAMS_FLUSH_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/detail/dispatch.hpp> |
18 | #include <boost/iostreams/detail/streambuf.hpp> |
19 | #include <boost/iostreams/detail/wrap_unwrap.hpp> |
20 | #include <boost/iostreams/operations_fwd.hpp> |
21 | #include <boost/iostreams/traits.hpp> |
22 | #include <boost/mpl/if.hpp> |
23 | |
24 | // Must come last. |
25 | #include <boost/iostreams/detail/config/disable_warnings.hpp> |
26 | |
27 | namespace boost { namespace iostreams { |
28 | |
29 | namespace detail { |
30 | |
31 | template<typename T> |
32 | struct flush_device_impl; |
33 | |
34 | template<typename T> |
35 | struct flush_filter_impl; |
36 | |
37 | } // End namespace detail. |
38 | |
39 | template<typename T> |
40 | bool flush(T& t) |
41 | { return detail::flush_device_impl<T>::flush(detail::unwrap(t)); } |
42 | |
43 | template<typename T, typename Sink> |
44 | bool flush(T& t, Sink& snk) |
45 | { return detail::flush_filter_impl<T>::flush(detail::unwrap(t), snk); } |
46 | |
47 | namespace detail { |
48 | |
49 | //------------------Definition of flush_device_impl---------------------------// |
50 | |
51 | template<typename T> |
52 | struct flush_device_impl |
53 | : mpl::if_< |
54 | is_custom<T>, |
55 | operations<T>, |
56 | flush_device_impl< |
57 | BOOST_DEDUCED_TYPENAME |
58 | dispatch< |
59 | T, ostream_tag, streambuf_tag, flushable_tag, any_tag |
60 | >::type |
61 | > |
62 | >::type |
63 | { }; |
64 | |
65 | template<> |
66 | struct flush_device_impl<ostream_tag> { |
67 | template<typename T> |
68 | static bool flush(T& t) |
69 | { return t.rdbuf()->BOOST_IOSTREAMS_PUBSYNC() == 0; } |
70 | }; |
71 | |
72 | template<> |
73 | struct flush_device_impl<streambuf_tag> { |
74 | template<typename T> |
75 | static bool flush(T& t) |
76 | { return t.BOOST_IOSTREAMS_PUBSYNC() == 0; } |
77 | }; |
78 | |
79 | template<> |
80 | struct flush_device_impl<flushable_tag> { |
81 | template<typename T> |
82 | static bool flush(T& t) { return t.flush(); } |
83 | }; |
84 | |
85 | template<> |
86 | struct flush_device_impl<any_tag> { |
87 | template<typename T> |
88 | static bool flush(T&) { return true; } |
89 | }; |
90 | |
91 | //------------------Definition of flush_filter_impl---------------------------// |
92 | |
93 | template<typename T> |
94 | struct flush_filter_impl |
95 | : mpl::if_< |
96 | is_custom<T>, |
97 | operations<T>, |
98 | flush_filter_impl< |
99 | BOOST_DEDUCED_TYPENAME |
100 | dispatch< |
101 | T, flushable_tag, any_tag |
102 | >::type |
103 | > |
104 | >::type |
105 | { }; |
106 | |
107 | template<> |
108 | struct flush_filter_impl<flushable_tag> { |
109 | template<typename T, typename Sink> |
110 | static bool flush(T& t, Sink& snk) { return t.flush(snk); } |
111 | }; |
112 | |
113 | template<> |
114 | struct flush_filter_impl<any_tag> { |
115 | template<typename T, typename Sink> |
116 | static bool flush(T&, Sink&) { return false; } |
117 | }; |
118 | |
119 | } // End namespace detail. |
120 | |
121 | } } // End namespaces iostreams, boost. |
122 | |
123 | #include <boost/iostreams/detail/config/enable_warnings.hpp> |
124 | |
125 | #endif // #ifndef BOOST_IOSTREAMS_FLUSH_HPP_INCLUDED |
126 | |