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) && (_MSC_VER >= 1020) |
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 |
167 | |