167 lines
6.3 KiB
C++
Executable File
167 lines
6.3 KiB
C++
Executable File
// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
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// (C) Copyright 2004-2007 Jonathan Turkanis
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
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// See http://www.boost.org/libs/iostreams for documentation.
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#ifndef BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED
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#define BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED
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#if defined(_MSC_VER) && (_MSC_VER >= 1020)
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# pragma once
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#endif
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#include <memory> // allocator.
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#include <boost/iostreams/detail/access_control.hpp>
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#include <boost/iostreams/detail/char_traits.hpp>
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#include <boost/iostreams/detail/iostream.hpp> // standard streams.
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#include <boost/iostreams/detail/push.hpp>
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#include <boost/iostreams/detail/select.hpp>
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#include <boost/iostreams/detail/streambuf.hpp> // pubsync.
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#include <boost/iostreams/filtering_streambuf.hpp>
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#include <boost/mpl/and.hpp>
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#include <boost/mpl/bool.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/type_traits/is_convertible.hpp>
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// Must come last.
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#include <boost/iostreams/detail/config/disable_warnings.hpp> // MSVC.
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namespace boost { namespace iostreams {
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//--------------Definition of filtered_istream--------------------------------//
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namespace detail {
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template<typename Mode, typename Ch, typename Tr>
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struct filtering_stream_traits {
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typedef typename
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iostreams::select< // Disambiguation for Tru64
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mpl::and_<
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is_convertible<Mode, input>,
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is_convertible<Mode, output>
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>,
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BOOST_IOSTREAMS_BASIC_IOSTREAM(Ch, Tr),
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is_convertible<Mode, input>,
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BOOST_IOSTREAMS_BASIC_ISTREAM(Ch, Tr),
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else_,
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BOOST_IOSTREAMS_BASIC_OSTREAM(Ch, Tr)
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>::type stream_type;
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typedef typename
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iostreams::select< // Dismbiguation required for Tru64.
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mpl::and_<
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is_convertible<Mode, input>,
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is_convertible<Mode, output>
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>,
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iostream_tag,
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is_convertible<Mode, input>,
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istream_tag,
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else_,
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ostream_tag
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>::type stream_tag;
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};
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template<typename Chain, typename Access>
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class filtering_stream_base
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: public access_control<
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boost::iostreams::detail::chain_client<Chain>,
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Access
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>,
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public filtering_stream_traits<
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typename Chain::mode,
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typename Chain::char_type,
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typename Chain::traits_type
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>::stream_type
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{
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public:
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typedef Chain chain_type;
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typedef access_control<
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boost::iostreams::detail::chain_client<Chain>,
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Access
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> client_type;
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protected:
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typedef typename
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filtering_stream_traits<
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typename Chain::mode,
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typename Chain::char_type,
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typename Chain::traits_type
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>::stream_type stream_type;
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filtering_stream_base() : stream_type(0) { this->set_chain(&chain_); }
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private:
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void notify() { this->rdbuf(chain_.empty() ? 0 : &chain_.front()); }
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Chain chain_;
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};
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} // End namespace detail.
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//
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// Macro: BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(name_, chain_type_, default_char_)
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// Description: Defines a template derived from std::basic_streambuf which uses
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// a chain to perform i/o. The template has the following parameters:
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// Mode - the i/o mode.
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// Ch - The character type.
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// Tr - The character traits type.
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// Alloc - The allocator type.
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// Access - Indicates accessibility of the chain interface; must be either
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// public_ or protected_; defaults to public_.
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// Macro parameters:
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// name_ - The name of the template to be defined.
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// chain_type_ - The name of the chain template.
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// default_char_ - The default value for the char template parameter.
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//
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#define BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(name_, chain_type_, default_char_) \
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template< typename Mode, \
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typename Ch = default_char_, \
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typename Tr = BOOST_IOSTREAMS_CHAR_TRAITS(Ch), \
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typename Alloc = std::allocator<Ch>, \
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typename Access = public_ > \
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class name_ \
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: public boost::iostreams::detail::filtering_stream_base< \
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chain_type_<Mode, Ch, Tr, Alloc>, Access \
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> \
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{ \
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public: \
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typedef Ch char_type; \
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struct category \
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: Mode, \
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closable_tag, \
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detail::filtering_stream_traits<Mode, Ch, Tr>::stream_tag \
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{ }; \
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BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr) \
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typedef Mode mode; \
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typedef chain_type_<Mode, Ch, Tr, Alloc> chain_type; \
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name_() { } \
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BOOST_IOSTREAMS_DEFINE_PUSH_CONSTRUCTOR(name_, mode, Ch, push_impl) \
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~name_() { \
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if (this->is_complete()) \
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this->rdbuf()->BOOST_IOSTREAMS_PUBSYNC(); \
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} \
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private: \
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typedef access_control< \
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boost::iostreams::detail::chain_client< \
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chain_type_<Mode, Ch, Tr, Alloc> \
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>, \
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Access \
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> client_type; \
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template<typename T> \
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void push_impl(const T& t BOOST_IOSTREAMS_PUSH_PARAMS()) \
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{ client_type::push(t BOOST_IOSTREAMS_PUSH_ARGS()); } \
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}; \
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/**/
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BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(filtering_stream, boost::iostreams::chain, char)
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BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(wfiltering_stream, boost::iostreams::chain, wchar_t)
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typedef filtering_stream<input> filtering_istream;
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typedef filtering_stream<output> filtering_ostream;
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typedef wfiltering_stream<input> filtering_wistream;
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typedef wfiltering_stream<output> filtering_wostream;
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//----------------------------------------------------------------------------//
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} } // End namespace iostreams, boost
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#include <boost/iostreams/detail/config/enable_warnings.hpp> // MSVC
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#endif // #ifndef BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED
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