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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) | |
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 |