boost/iostreams/filtering_stream.hpp
// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) // (C) Copyright 2004-2007 Jonathan Turkanis // Distributed under the Boost Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.) // See http://www.boost.org/libs/iostreams for documentation. #ifndef BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED #define BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED #if defined(_MSC_VER) # pragma once #endif #include <memory> // allocator. #include <boost/iostreams/detail/access_control.hpp> #include <boost/iostreams/detail/char_traits.hpp> #include <boost/iostreams/detail/iostream.hpp> // standard streams. #include <boost/iostreams/detail/push.hpp> #include <boost/iostreams/detail/select.hpp> #include <boost/iostreams/detail/streambuf.hpp> // pubsync. #include <boost/iostreams/filtering_streambuf.hpp> #include <boost/mpl/and.hpp> #include <boost/mpl/bool.hpp> #include <boost/static_assert.hpp> #include <boost/type_traits/is_convertible.hpp> // Must come last. #include <boost/iostreams/detail/config/disable_warnings.hpp> // MSVC. namespace boost { namespace iostreams { //--------------Definition of filtered_istream--------------------------------// namespace detail { template<typename Mode, typename Ch, typename Tr> struct filtering_stream_traits { typedef typename iostreams::select< // Disambiguation for Tru64 mpl::and_< is_convertible<Mode, input>, is_convertible<Mode, output> >, BOOST_IOSTREAMS_BASIC_IOSTREAM(Ch, Tr), is_convertible<Mode, input>, BOOST_IOSTREAMS_BASIC_ISTREAM(Ch, Tr), else_, BOOST_IOSTREAMS_BASIC_OSTREAM(Ch, Tr) >::type stream_type; typedef typename iostreams::select< // Dismbiguation required for Tru64. mpl::and_< is_convertible<Mode, input>, is_convertible<Mode, output> >, iostream_tag, is_convertible<Mode, input>, istream_tag, else_, ostream_tag >::type stream_tag; }; #if defined(BOOST_MSVC) && (BOOST_MSVC == 1700) # pragma warning(push) // https://connect.microsoft.com/VisualStudio/feedback/details/733720/ # pragma warning(disable: 4250) #endif template<typename Chain, typename Access> class filtering_stream_base : public access_control< boost::iostreams::detail::chain_client<Chain>, Access >, public filtering_stream_traits< typename Chain::mode, typename Chain::char_type, typename Chain::traits_type >::stream_type { public: typedef Chain chain_type; typedef access_control< boost::iostreams::detail::chain_client<Chain>, Access > client_type; protected: typedef typename filtering_stream_traits< typename Chain::mode, typename Chain::char_type, typename Chain::traits_type >::stream_type stream_type; filtering_stream_base() : stream_type(0) { this->set_chain(&chain_); } private: void notify() { this->rdbuf(chain_.empty() ? 0 : &chain_.front()); } Chain chain_; }; #if defined(BOOST_MSVC) && (BOOST_MSVC == 1700) # pragma warning(pop) #endif } // End namespace detail. // // Macro: BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(name_, chain_type_, default_char_) // Description: Defines a template derived from std::basic_streambuf which uses // a chain to perform i/o. The template has the following parameters: // Mode - the i/o mode. // Ch - The character type. // Tr - The character traits type. // Alloc - The allocator type. // Access - Indicates accessibility of the chain interface; must be either // public_ or protected_; defaults to public_. // Macro parameters: // name_ - The name of the template to be defined. // chain_type_ - The name of the chain template. // default_char_ - The default value for the char template parameter. // #define BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(name_, chain_type_, default_char_) \ template< typename Mode, \ typename Ch = default_char_, \ typename Tr = BOOST_IOSTREAMS_CHAR_TRAITS(Ch), \ typename Alloc = std::allocator<Ch>, \ typename Access = public_ > \ class name_ \ : public boost::iostreams::detail::filtering_stream_base< \ chain_type_<Mode, Ch, Tr, Alloc>, Access \ > \ { \ public: \ typedef Ch char_type; \ struct category \ : Mode, \ closable_tag, \ detail::filtering_stream_traits<Mode, Ch, Tr>::stream_tag \ { }; \ BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(Tr) \ typedef Mode mode; \ typedef chain_type_<Mode, Ch, Tr, Alloc> chain_type; \ name_() { } \ BOOST_IOSTREAMS_DEFINE_PUSH_CONSTRUCTOR(name_, mode, Ch, push_impl) \ ~name_() { \ if (this->is_complete()) \ this->rdbuf()->BOOST_IOSTREAMS_PUBSYNC(); \ } \ private: \ typedef access_control< \ boost::iostreams::detail::chain_client< \ chain_type_<Mode, Ch, Tr, Alloc> \ >, \ Access \ > client_type; \ template<typename T> \ void push_impl(const T& t BOOST_IOSTREAMS_PUSH_PARAMS()) \ { client_type::push(t BOOST_IOSTREAMS_PUSH_ARGS()); } \ }; \ /**/ #if defined(BOOST_MSVC) && (BOOST_MSVC == 1700) # pragma warning(push) // https://connect.microsoft.com/VisualStudio/feedback/details/733720/ # pragma warning(disable: 4250) #endif BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(filtering_stream, boost::iostreams::chain, char) BOOST_IOSTREAMS_DEFINE_FILTER_STREAM(wfiltering_stream, boost::iostreams::chain, wchar_t) #if defined(BOOST_MSVC) && (BOOST_MSVC == 1700) # pragma warning(pop) #endif typedef filtering_stream<input> filtering_istream; typedef filtering_stream<output> filtering_ostream; typedef wfiltering_stream<input> filtering_wistream; typedef wfiltering_stream<output> filtering_wostream; //----------------------------------------------------------------------------// } } // End namespace iostreams, boost #include <boost/iostreams/detail/config/enable_warnings.hpp> // MSVC #endif // #ifndef BOOST_IOSTREAMS_FILTER_STREAM_HPP_INCLUDED