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1 | // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) |
2 | // (C) Copyright 2004-2007 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_FILTER_STREAM_HPP_INCLUDED | |
9 | #define BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED | |
10 | ||
11 | #if defined(_MSC_VER) | |
12 | # pragma once | |
13 | #endif | |
14 | ||
15 | #include <memory> // allocator. | |
16 | #include <boost/iostreams/detail/access_control.hpp> | |
17 | #include <boost/iostreams/detail/char_traits.hpp> | |
18 | #include <boost/iostreams/detail/iostream.hpp> // standard streams. | |
19 | #include <boost/iostreams/detail/push.hpp> | |
20 | #include <boost/iostreams/detail/select.hpp> | |
21 | #include <boost/iostreams/detail/streambuf.hpp> // pubsync. | |
22 | #include <boost/iostreams/filtering_streambuf.hpp> | |
23 | #include <boost/mpl/and.hpp> | |
24 | #include <boost/mpl/bool.hpp> | |
25 | #include <boost/static_assert.hpp> | |
26 | #include <boost/type_traits/is_convertible.hpp> | |
27 | ||
28 | // Must come last. | |
29 | #include <boost/iostreams/detail/config/disable_warnings.hpp> // MSVC. | |
30 | ||
31 | namespace boost { namespace iostreams { | |
32 | ||
33 | //--------------Definition of filtered_istream--------------------------------// | |
34 | ||
35 | namespace detail { | |
36 | ||
37 | template<typename Mode, typename Ch, typename Tr> | |
38 | struct filtering_stream_traits { | |
39 | typedef typename | |
40 | iostreams::select< // Disambiguation for Tru64 | |
41 | mpl::and_< | |
42 | is_convertible<Mode, input>, | |
43 | is_convertible<Mode, output> | |
44 | >, | |
45 | BOOST_IOSTREAMS_BASIC_IOSTREAM(Ch, Tr), | |
46 | is_convertible<Mode, input>, | |
47 | BOOST_IOSTREAMS_BASIC_ISTREAM(Ch, Tr), | |
48 | else_, | |
49 | BOOST_IOSTREAMS_BASIC_OSTREAM(Ch, Tr) | |
50 | >::type stream_type; | |
51 | typedef typename | |
52 | iostreams::select< // Dismbiguation required for Tru64. | |
53 | mpl::and_< | |
54 | is_convertible<Mode, input>, | |
55 | is_convertible<Mode, output> | |
56 | >, | |
57 | iostream_tag, | |
58 | is_convertible<Mode, input>, | |
59 | istream_tag, | |
60 | else_, | |
61 | ostream_tag | |
62 | >::type stream_tag; | |
63 | }; | |
64 | ||
65 | template<typename Chain, typename Access> | |
66 | class filtering_stream_base | |
67 | : public access_control< | |
68 | boost::iostreams::detail::chain_client<Chain>, | |
69 | Access | |
70 | >, | |
71 | public filtering_stream_traits< | |
72 | typename Chain::mode, | |
73 | typename Chain::char_type, | |
74 | typename Chain::traits_type | |
75 | >::stream_type | |
76 | { | |
77 | public: | |
78 | typedef Chain chain_type; | |
79 | typedef access_control< | |
80 | boost::iostreams::detail::chain_client<Chain>, | |
81 | Access | |
82 | > client_type; | |
83 | protected: | |
84 | typedef typename | |
85 | filtering_stream_traits< | |
86 | typename Chain::mode, | |
87 | typename Chain::char_type, | |
88 | typename Chain::traits_type | |
89 | >::stream_type stream_type; | |
90 | filtering_stream_base() : stream_type(0) { this->set_chain(&chain_); } | |
91 | private: | |
92 | void notify() { this->rdbuf(chain_.empty() ? 0 : &chain_.front()); } | |
93 | Chain chain_; | |
94 | }; | |
95 | ||
96 | } // End namespace detail. | |
97 | ||
98 | // | |
99 | // Macro: BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(name_, chain_type_, default_char_) | |
100 | // Description: Defines a template derived from std::basic_streambuf which uses | |
101 | // a chain to perform i/o. The template has the following parameters: | |
102 | // Mode - the i/o mode. | |
103 | // Ch - The character type. | |
104 | // Tr - The character traits type. | |
105 | // Alloc - The allocator type. | |
106 | // Access - Indicates accessibility of the chain interface; must be either | |
107 | // public_ or protected_; defaults to public_. | |
108 | // Macro parameters: | |
109 | // name_ - The name of the template to be defined. | |
110 | // chain_type_ - The name of the chain template. | |
111 | // default_char_ - The default value for the char template parameter. | |
112 | // | |
113 | #define BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(name_, chain_type_, default_char_) \ | |
114 | template< typename Mode, \ | |
115 | typename Ch = default_char_, \ | |
116 | typename Tr = BOOST_IOSTREAMS_CHAR_TRAITS(Ch), \ | |
117 | typename Alloc = std::allocator<Ch>, \ | |
118 | typename Access = public_ > \ | |
119 | class name_ \ | |
120 | : public boost::iostreams::detail::filtering_stream_base< \ | |
121 | chain_type_<Mode, Ch, Tr, Alloc>, Access \ | |
122 | > \ | |
123 | { \ | |
124 | public: \ | |
125 | typedef Ch char_type; \ | |
126 | struct category \ | |
127 | : Mode, \ | |
128 | closable_tag, \ | |
129 | detail::filtering_stream_traits<Mode, Ch, Tr>::stream_tag \ | |
130 | { }; \ | |
131 | BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr) \ | |
132 | typedef Mode mode; \ | |
133 | typedef chain_type_<Mode, Ch, Tr, Alloc> chain_type; \ | |
134 | name_() { } \ | |
135 | BOOST_IOSTREAMS_DEFINE_PUSH_CONSTRUCTOR(name_, mode, Ch, push_impl) \ | |
136 | ~name_() { \ | |
137 | if (this->is_complete()) \ | |
138 | this->rdbuf()->BOOST_IOSTREAMS_PUBSYNC(); \ | |
139 | } \ | |
140 | private: \ | |
141 | typedef access_control< \ | |
142 | boost::iostreams::detail::chain_client< \ | |
143 | chain_type_<Mode, Ch, Tr, Alloc> \ | |
144 | >, \ | |
145 | Access \ | |
146 | > client_type; \ | |
147 | template<typename T> \ | |
148 | void push_impl(const T& t BOOST_IOSTREAMS_PUSH_PARAMS()) \ | |
149 | { client_type::push(t BOOST_IOSTREAMS_PUSH_ARGS()); } \ | |
150 | }; \ | |
151 | /**/ | |
152 | BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(filtering_stream, boost::iostreams::chain, char) | |
153 | BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(wfiltering_stream, boost::iostreams::chain, wchar_t) | |
154 | ||
155 | typedef filtering_stream<input> filtering_istream; | |
156 | typedef filtering_stream<output> filtering_ostream; | |
157 | typedef wfiltering_stream<input> filtering_wistream; | |
158 | typedef wfiltering_stream<output> filtering_wostream; | |
159 | ||
160 | //----------------------------------------------------------------------------// | |
161 | ||
162 | } } // End namespace iostreams, boost | |
163 | ||
164 | #include <boost/iostreams/detail/config/enable_warnings.hpp> // MSVC | |
165 | ||
166 | #endif // #ifndef BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED |