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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_DETAIL_MODE_ADAPTER_HPP_INCLUDED | |
9 | #define BOOST_IOSTREAMS_DETAIL_MODE_ADAPTER_HPP_INCLUDED | |
10 | ||
11 | #if defined(_MSC_VER) | |
12 | # pragma once | |
13 | #endif | |
14 | ||
15 | // Contains the definition of the class template mode_adapter, which allows | |
16 | // a filter or device to function as if it has a different i/o mode than that | |
17 | // deduced by the metafunction mode_of. | |
18 | ||
19 | #include <boost/config.hpp> // BOOST_MSVC. | |
20 | #include <boost/detail/workaround.hpp> | |
21 | #include <boost/iostreams/categories.hpp> | |
22 | #include <boost/iostreams/detail/ios.hpp> // openmode, seekdir, int types. | |
23 | #include <boost/iostreams/traits.hpp> | |
24 | #include <boost/iostreams/operations.hpp> | |
25 | #include <boost/mpl/if.hpp> | |
26 | ||
27 | namespace boost { namespace iostreams { namespace detail { | |
28 | ||
29 | template<typename Mode, typename T> | |
30 | class mode_adapter { | |
31 | private: | |
32 | struct empty_base { }; | |
33 | public: | |
34 | typedef typename wrapped_type<T>::type component_type; | |
35 | typedef typename char_type_of<T>::type char_type; | |
36 | struct category | |
37 | : Mode, | |
38 | device_tag, | |
39 | mpl::if_<is_filter<T>, filter_tag, device_tag>, | |
40 | mpl::if_<is_filter<T>, multichar_tag, empty_base>, | |
41 | closable_tag, | |
42 | localizable_tag | |
43 | { }; | |
44 | explicit mode_adapter(const component_type& t) : t_(t) { } | |
45 | ||
46 | // Device member functions. | |
47 | ||
48 | std::streamsize read(char_type* s, std::streamsize n); | |
49 | std::streamsize write(const char_type* s, std::streamsize n); | |
50 | std::streampos seek( stream_offset off, BOOST_IOS::seekdir way, | |
51 | BOOST_IOS::openmode which = | |
52 | BOOST_IOS::in | BOOST_IOS::out ); | |
53 | void close(); | |
54 | void close(BOOST_IOS::openmode which); | |
55 | ||
56 | // Filter member functions. | |
57 | ||
58 | template<typename Source> | |
59 | std::streamsize read(Source& src, char_type* s, std::streamsize n) | |
60 | { return iostreams::read(t_, src, s, n); } | |
61 | ||
62 | template<typename Sink> | |
63 | std::streamsize write(Sink& snk, const char_type* s, std::streamsize n) | |
64 | { return iostreams::write(t_, snk, s, n); } | |
65 | ||
66 | template<typename Device> | |
67 | std::streampos seek(Device& dev, stream_offset off, BOOST_IOS::seekdir way) | |
68 | { return iostreams::seek(t_, dev, off, way); } | |
69 | ||
70 | template<typename Device> | |
71 | std::streampos seek( Device& dev, stream_offset off, | |
72 | BOOST_IOS::seekdir way, BOOST_IOS::openmode which ) | |
73 | { return iostreams::seek(t_, dev, off, way, which); } | |
74 | ||
75 | template<typename Device> | |
76 | void close(Device& dev) | |
77 | { detail::close_all(t_, dev); } | |
78 | ||
79 | template<typename Device> | |
80 | void close(Device& dev, BOOST_IOS::openmode which) | |
81 | { iostreams::close(t_, dev, which); } | |
82 | ||
83 | template<typename Locale> | |
84 | void imbue(const Locale& loc) | |
85 | { iostreams::imbue(t_, loc); } | |
86 | private: | |
87 | component_type t_; | |
88 | }; | |
89 | ||
90 | //------------------Implementation of mode_adapter----------------------------// | |
91 | ||
92 | template<typename Mode, typename T> | |
93 | std::streamsize mode_adapter<Mode, T>::read | |
94 | (char_type* s, std::streamsize n) | |
95 | { return boost::iostreams::read(t_, s, n); } | |
96 | ||
97 | template<typename Mode, typename T> | |
98 | std::streamsize mode_adapter<Mode, T>::write | |
99 | (const char_type* s, std::streamsize n) | |
100 | { return boost::iostreams::write(t_, s, n); } | |
101 | ||
102 | template<typename Mode, typename T> | |
103 | std::streampos mode_adapter<Mode, T>::seek | |
104 | (stream_offset off, BOOST_IOS::seekdir way, BOOST_IOS::openmode which) | |
105 | { return boost::iostreams::seek(t_, off, way, which); } | |
106 | ||
107 | template<typename Mode, typename T> | |
108 | void mode_adapter<Mode, T>::close() | |
109 | { detail::close_all(t_); } | |
110 | ||
111 | template<typename Mode, typename T> | |
112 | void mode_adapter<Mode, T>::close(BOOST_IOS::openmode which) | |
113 | { iostreams::close(t_, which); } | |
114 | ||
115 | } } } // End namespaces detail, iostreams, boost. | |
116 | ||
117 | #endif // #ifndef BOOST_IOSTREAMS_DETAIL_MODE_ADAPTER_HPP_INCLUDED //-----// |