[857] | 1 | // (C) Copyright Jonathan Turkanis 2004
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| 2 | // Distributed under the Boost Software License, Version 1.0. (See accompanying
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| 3 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
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| 4 |
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| 5 | // See http://www.boost.org/libs/iostreams for documentation.
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| 6 |
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| 7 | #ifndef BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED
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| 8 | #define BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED
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| 9 |
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| 10 | #if defined(_MSC_VER) && (_MSC_VER >= 1020)
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| 11 | # pragma once
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| 12 | #endif
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| 13 |
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| 14 | #include <memory> // allocator.
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| 15 | #include <boost/iostreams/detail/access_control.hpp>
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| 16 | #include <boost/iostreams/detail/char_traits.hpp>
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| 17 | #include <boost/iostreams/detail/iostream.hpp> // standard streams.
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| 18 | #include <boost/iostreams/detail/push.hpp>
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| 19 | #include <boost/iostreams/detail/select.hpp>
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| 20 | #include <boost/iostreams/detail/streambuf.hpp> // pubsync.
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| 21 | #include <boost/iostreams/filtering_streambuf.hpp>
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| 22 | #include <boost/mpl/and.hpp>
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| 23 | #include <boost/mpl/bool.hpp>
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| 24 | #include <boost/static_assert.hpp>
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| 25 | #include <boost/type_traits/is_convertible.hpp>
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| 26 |
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| 27 | // Must come last.
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| 28 | #include <boost/iostreams/detail/config/disable_warnings.hpp> // MSVC.
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| 29 |
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| 30 | namespace boost { namespace iostreams {
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| 31 |
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| 32 | //--------------Definition of filtered_istream--------------------------------//
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| 33 |
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| 34 | namespace detail {
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| 35 |
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| 36 | template<typename Mode, typename Ch, typename Tr>
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| 37 | struct filtering_stream_traits {
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| 38 | typedef typename
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| 39 | iostreams::select< // Disambiguation for Tru64
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| 40 | mpl::and_<
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| 41 | is_convertible<Mode, input>,
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| 42 | is_convertible<Mode, output>
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| 43 | >,
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| 44 | BOOST_IOSTREAMS_BASIC_IOSTREAM(Ch, Tr),
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| 45 | is_convertible<Mode, input>,
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| 46 | BOOST_IOSTREAMS_BASIC_ISTREAM(Ch, Tr),
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| 47 | else_,
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| 48 | BOOST_IOSTREAMS_BASIC_OSTREAM(Ch, Tr)
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| 49 | >::type type;
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| 50 | };
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| 51 |
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| 52 | template<typename Chain, typename Access>
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| 53 | class filtering_stream_base
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| 54 | : public access_control<
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| 55 | boost::iostreams::detail::chain_client<Chain>,
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| 56 | Access
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| 57 | >,
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| 58 | public filtering_stream_traits<
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| 59 | typename Chain::mode,
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| 60 | typename Chain::char_type,
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| 61 | typename Chain::traits_type
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| 62 | >::type
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| 63 | {
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| 64 | public:
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| 65 | typedef Chain chain_type;
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| 66 | typedef access_control<
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| 67 | boost::iostreams::detail::chain_client<Chain>,
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| 68 | Access
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| 69 | > client_type;
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| 70 | protected:
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| 71 | typedef typename
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| 72 | filtering_stream_traits<
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| 73 | typename Chain::mode,
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| 74 | typename Chain::char_type,
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| 75 | typename Chain::traits_type
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| 76 | >::type stream_type;
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| 77 | filtering_stream_base() : stream_type(0) { this->set_chain(&chain_); }
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| 78 | private:
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| 79 | void notify() { this->rdbuf(chain_.empty() ? 0 : &chain_.front()); }
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| 80 | Chain chain_;
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| 81 | };
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| 82 |
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| 83 | } // End namespace detail.
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| 84 |
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| 85 | //
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| 86 | // Macro: BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(name_, chain_type_, default_char_)
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| 87 | // Description: Defines a template derived from std::basic_streambuf which uses
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| 88 | // a chain to perform i/o. The template has the following parameters:
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| 89 | // Mode - the i/o mode.
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| 90 | // Ch - The character type.
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| 91 | // Tr - The character traits type.
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| 92 | // Alloc - The allocator type.
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| 93 | // Access - Indicates accessibility of the chain interface; must be either
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| 94 | // public_ or protected_; defaults to public_.
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| 95 | // Macro parameters:
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| 96 | // name_ - The name of the template to be defined.
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| 97 | // chain_type_ - The name of the chain template.
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| 98 | // default_char_ - The default value for the char template parameter.
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| 99 | //
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| 100 | #define BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(name_, chain_type_, default_char_) \
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| 101 | template< typename Mode, \
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| 102 | typename Ch = default_char_, \
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| 103 | typename Tr = BOOST_IOSTREAMS_CHAR_TRAITS(Ch), \
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| 104 | typename Alloc = std::allocator<Ch>, \
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| 105 | typename Access = public_ > \
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| 106 | class name_ \
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| 107 | : public boost::iostreams::detail::filtering_stream_base< \
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| 108 | chain_type_<Mode, Ch, Tr, Alloc>, Access \
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| 109 | > \
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| 110 | { \
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| 111 | public: \
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| 112 | typedef Ch char_type; \
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| 113 | BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr) \
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| 114 | typedef Mode mode; \
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| 115 | typedef chain_type_<Mode, Ch, Tr, Alloc> chain_type; \
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| 116 | name_() { } \
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| 117 | BOOST_IOSTREAMS_DEFINE_PUSH_CONSTRUCTOR(name_, mode, Ch, push_impl) \
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| 118 | ~name_() { \
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| 119 | if (this->is_complete()) \
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| 120 | this->rdbuf()->BOOST_IOSTREAMS_PUBSYNC(); \
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| 121 | } \
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| 122 | private: \
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| 123 | typedef access_control< \
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| 124 | boost::iostreams::detail::chain_client< \
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| 125 | chain_type_<Mode, Ch, Tr, Alloc> \
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| 126 | >, \
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| 127 | Access \
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| 128 | > client_type; \
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| 129 | template<typename T> \
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| 130 | void push_impl(const T& t BOOST_IOSTREAMS_PUSH_PARAMS()) \
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| 131 | { client_type::push(t BOOST_IOSTREAMS_PUSH_ARGS()); } \
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| 132 | }; \
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| 133 | /**/
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| 134 | BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(filtering_stream, boost::iostreams::chain, char)
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| 135 | BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(wfiltering_stream, boost::iostreams::chain, wchar_t)
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| 136 |
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| 137 | typedef filtering_stream<input> filtering_istream;
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| 138 | typedef filtering_stream<output> filtering_ostream;
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| 139 | typedef wfiltering_stream<input> filtering_wistream;
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| 140 | typedef wfiltering_stream<output> filtering_wostream;
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| 141 |
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| 142 | //----------------------------------------------------------------------------//
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| 143 |
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| 144 | } } // End namespace iostreams, boost
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| 145 |
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| 146 | #include <boost/iostreams/detail/config/enable_warnings.hpp> // MSVC
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| 147 |
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| 148 | #endif // #ifndef BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED
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