1 | // (C) Copyright Jonathan Turkanis 2004
|
---|
2 | // Distributed under the Boost Software License, Version 1.0. (See accompanying
|
---|
3 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
|
---|
4 |
|
---|
5 | // See http://www.boost.org/libs/iostreams for documentation.
|
---|
6 |
|
---|
7 | #ifndef BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED
|
---|
8 | #define BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED
|
---|
9 |
|
---|
10 | #if defined(_MSC_VER) && (_MSC_VER >= 1020)
|
---|
11 | # pragma once
|
---|
12 | #endif
|
---|
13 |
|
---|
14 | #include <memory> // allocator.
|
---|
15 | #include <boost/iostreams/detail/access_control.hpp>
|
---|
16 | #include <boost/iostreams/detail/char_traits.hpp>
|
---|
17 | #include <boost/iostreams/detail/iostream.hpp> // standard streams.
|
---|
18 | #include <boost/iostreams/detail/push.hpp>
|
---|
19 | #include <boost/iostreams/detail/select.hpp>
|
---|
20 | #include <boost/iostreams/detail/streambuf.hpp> // pubsync.
|
---|
21 | #include <boost/iostreams/filtering_streambuf.hpp>
|
---|
22 | #include <boost/mpl/and.hpp>
|
---|
23 | #include <boost/mpl/bool.hpp>
|
---|
24 | #include <boost/static_assert.hpp>
|
---|
25 | #include <boost/type_traits/is_convertible.hpp>
|
---|
26 |
|
---|
27 | // Must come last.
|
---|
28 | #include <boost/iostreams/detail/config/disable_warnings.hpp> // MSVC.
|
---|
29 |
|
---|
30 | namespace boost { namespace iostreams {
|
---|
31 |
|
---|
32 | //--------------Definition of filtered_istream--------------------------------//
|
---|
33 |
|
---|
34 | namespace detail {
|
---|
35 |
|
---|
36 | template<typename Mode, typename Ch, typename Tr>
|
---|
37 | struct filtering_stream_traits {
|
---|
38 | typedef typename
|
---|
39 | iostreams::select< // Disambiguation for Tru64
|
---|
40 | mpl::and_<
|
---|
41 | is_convertible<Mode, input>,
|
---|
42 | is_convertible<Mode, output>
|
---|
43 | >,
|
---|
44 | BOOST_IOSTREAMS_BASIC_IOSTREAM(Ch, Tr),
|
---|
45 | is_convertible<Mode, input>,
|
---|
46 | BOOST_IOSTREAMS_BASIC_ISTREAM(Ch, Tr),
|
---|
47 | else_,
|
---|
48 | BOOST_IOSTREAMS_BASIC_OSTREAM(Ch, Tr)
|
---|
49 | >::type type;
|
---|
50 | };
|
---|
51 |
|
---|
52 | template<typename Chain, typename Access>
|
---|
53 | class filtering_stream_base
|
---|
54 | : public access_control<
|
---|
55 | boost::iostreams::detail::chain_client<Chain>,
|
---|
56 | Access
|
---|
57 | >,
|
---|
58 | public filtering_stream_traits<
|
---|
59 | typename Chain::mode,
|
---|
60 | typename Chain::char_type,
|
---|
61 | typename Chain::traits_type
|
---|
62 | >::type
|
---|
63 | {
|
---|
64 | public:
|
---|
65 | typedef Chain chain_type;
|
---|
66 | typedef access_control<
|
---|
67 | boost::iostreams::detail::chain_client<Chain>,
|
---|
68 | Access
|
---|
69 | > client_type;
|
---|
70 | protected:
|
---|
71 | typedef typename
|
---|
72 | filtering_stream_traits<
|
---|
73 | typename Chain::mode,
|
---|
74 | typename Chain::char_type,
|
---|
75 | typename Chain::traits_type
|
---|
76 | >::type stream_type;
|
---|
77 | filtering_stream_base() : stream_type(0) { this->set_chain(&chain_); }
|
---|
78 | private:
|
---|
79 | void notify() { this->rdbuf(chain_.empty() ? 0 : &chain_.front()); }
|
---|
80 | Chain chain_;
|
---|
81 | };
|
---|
82 |
|
---|
83 | } // End namespace detail.
|
---|
84 |
|
---|
85 | //
|
---|
86 | // Macro: BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(name_, chain_type_, default_char_)
|
---|
87 | // Description: Defines a template derived from std::basic_streambuf which uses
|
---|
88 | // a chain to perform i/o. The template has the following parameters:
|
---|
89 | // Mode - the i/o mode.
|
---|
90 | // Ch - The character type.
|
---|
91 | // Tr - The character traits type.
|
---|
92 | // Alloc - The allocator type.
|
---|
93 | // Access - Indicates accessibility of the chain interface; must be either
|
---|
94 | // public_ or protected_; defaults to public_.
|
---|
95 | // Macro parameters:
|
---|
96 | // name_ - The name of the template to be defined.
|
---|
97 | // chain_type_ - The name of the chain template.
|
---|
98 | // default_char_ - The default value for the char template parameter.
|
---|
99 | //
|
---|
100 | #define BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(name_, chain_type_, default_char_) \
|
---|
101 | template< typename Mode, \
|
---|
102 | typename Ch = default_char_, \
|
---|
103 | typename Tr = BOOST_IOSTREAMS_CHAR_TRAITS(Ch), \
|
---|
104 | typename Alloc = std::allocator<Ch>, \
|
---|
105 | typename Access = public_ > \
|
---|
106 | class name_ \
|
---|
107 | : public boost::iostreams::detail::filtering_stream_base< \
|
---|
108 | chain_type_<Mode, Ch, Tr, Alloc>, Access \
|
---|
109 | > \
|
---|
110 | { \
|
---|
111 | public: \
|
---|
112 | typedef Ch char_type; \
|
---|
113 | BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr) \
|
---|
114 | typedef Mode mode; \
|
---|
115 | typedef chain_type_<Mode, Ch, Tr, Alloc> chain_type; \
|
---|
116 | name_() { } \
|
---|
117 | BOOST_IOSTREAMS_DEFINE_PUSH_CONSTRUCTOR(name_, mode, Ch, push_impl) \
|
---|
118 | ~name_() { \
|
---|
119 | if (this->is_complete()) \
|
---|
120 | this->rdbuf()->BOOST_IOSTREAMS_PUBSYNC(); \
|
---|
121 | } \
|
---|
122 | private: \
|
---|
123 | typedef access_control< \
|
---|
124 | boost::iostreams::detail::chain_client< \
|
---|
125 | chain_type_<Mode, Ch, Tr, Alloc> \
|
---|
126 | >, \
|
---|
127 | Access \
|
---|
128 | > client_type; \
|
---|
129 | template<typename T> \
|
---|
130 | void push_impl(const T& t BOOST_IOSTREAMS_PUSH_PARAMS()) \
|
---|
131 | { client_type::push(t BOOST_IOSTREAMS_PUSH_ARGS()); } \
|
---|
132 | }; \
|
---|
133 | /**/
|
---|
134 | BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(filtering_stream, boost::iostreams::chain, char)
|
---|
135 | BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(wfiltering_stream, boost::iostreams::chain, wchar_t)
|
---|
136 |
|
---|
137 | typedef filtering_stream<input> filtering_istream;
|
---|
138 | typedef filtering_stream<output> filtering_ostream;
|
---|
139 | typedef wfiltering_stream<input> filtering_wistream;
|
---|
140 | typedef wfiltering_stream<output> filtering_wostream;
|
---|
141 |
|
---|
142 | //----------------------------------------------------------------------------//
|
---|
143 |
|
---|
144 | } } // End namespace iostreams, boost
|
---|
145 |
|
---|
146 | #include <boost/iostreams/detail/config/enable_warnings.hpp> // MSVC
|
---|
147 |
|
---|
148 | #endif // #ifndef BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED
|
---|