261 lines
8.7 KiB
C++
261 lines
8.7 KiB
C++
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// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
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// (C) Copyright 2003-2007 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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// To do: add support for random-access.
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#ifndef BOOST_IOSTREAMS_COMBINE_HPP_INCLUDED
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#define BOOST_IOSTREAMS_COMBINE_HPP_INCLUDED
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#if defined(_MSC_VER)
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# pragma once
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#endif
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#include <boost/config.hpp> // NO_STD_LOCALE, DEDUCED_TYPENAME.
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#ifndef BOOST_NO_STD_LOCALE
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# include <locale>
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#endif
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#include <boost/iostreams/detail/ios.hpp>
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#include <boost/iostreams/detail/wrap_unwrap.hpp>
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#include <boost/iostreams/traits.hpp>
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#include <boost/iostreams/operations.hpp>
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#include <boost/mpl/if.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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#include <boost/type_traits/is_same.hpp>
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// Must come last.
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#include <boost/iostreams/detail/config/disable_warnings.hpp>
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namespace boost { namespace iostreams {
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namespace detail {
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//
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// Template name: combined_device.
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// Description: Model of Device defined in terms of a Source/Sink pair.
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// Template parameters:
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// Source - A model of Source, with the same char_type and traits_type
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// as Sink.
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// Sink - A model of Sink, with the same char_type and traits_type
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// as Source.
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//
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template<typename Source, typename Sink>
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class combined_device {
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private:
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typedef typename category_of<Source>::type in_category;
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typedef typename category_of<Sink>::type out_category;
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typedef typename char_type_of<Sink>::type sink_char_type;
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public:
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typedef typename char_type_of<Source>::type char_type;
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struct category
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: bidirectional,
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device_tag,
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closable_tag,
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localizable_tag
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{ };
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BOOST_STATIC_ASSERT(is_device<Source>::value);
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BOOST_STATIC_ASSERT(is_device<Sink>::value);
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BOOST_STATIC_ASSERT((is_convertible<in_category, input>::value));
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BOOST_STATIC_ASSERT((is_convertible<out_category, output>::value));
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BOOST_STATIC_ASSERT((is_same<char_type, sink_char_type>::value));
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combined_device(const Source& src, const Sink& snk);
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std::streamsize read(char_type* s, std::streamsize n);
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std::streamsize write(const char_type* s, std::streamsize n);
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void close(BOOST_IOS::openmode);
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#ifndef BOOST_NO_STD_LOCALE
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void imbue(const std::locale& loc);
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#endif
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private:
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Source src_;
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Sink sink_;
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};
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//
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// Template name: combined_filter.
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// Description: Model of Device defined in terms of a Source/Sink pair.
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// Template parameters:
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// InputFilter - A model of InputFilter, with the same char_type as
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// OutputFilter.
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// OutputFilter - A model of OutputFilter, with the same char_type as
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// InputFilter.
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//
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template<typename InputFilter, typename OutputFilter>
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class combined_filter {
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private:
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typedef typename category_of<InputFilter>::type in_category;
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typedef typename category_of<OutputFilter>::type out_category;
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typedef typename char_type_of<OutputFilter>::type output_char_type;
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public:
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typedef typename char_type_of<InputFilter>::type char_type;
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struct category
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: multichar_bidirectional_filter_tag,
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closable_tag,
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localizable_tag
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{ };
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BOOST_STATIC_ASSERT(is_filter<InputFilter>::value);
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BOOST_STATIC_ASSERT(is_filter<OutputFilter>::value);
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BOOST_STATIC_ASSERT((is_convertible<in_category, input>::value));
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BOOST_STATIC_ASSERT((is_convertible<out_category, output>::value));
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BOOST_STATIC_ASSERT((is_same<char_type, output_char_type>::value));
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combined_filter(const InputFilter& in, const OutputFilter& out);
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template<typename Source>
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std::streamsize read(Source& src, char_type* s, std::streamsize n)
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{ return boost::iostreams::read(in_, src, s, n); }
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template<typename Sink>
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std::streamsize write(Sink& snk, const char_type* s, std::streamsize n)
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{ return boost::iostreams::write(out_, snk, s, n); }
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template<typename Sink>
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void close(Sink& snk, BOOST_IOS::openmode which)
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{
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if (which == BOOST_IOS::in) {
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if (is_convertible<in_category, dual_use>::value) {
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iostreams::close(in_, snk, BOOST_IOS::in);
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} else {
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detail::close_all(in_, snk);
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}
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}
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if (which == BOOST_IOS::out) {
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if (is_convertible<out_category, dual_use>::value) {
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iostreams::close(out_, snk, BOOST_IOS::out);
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} else {
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detail::close_all(out_, snk);
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}
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}
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}
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#ifndef BOOST_NO_STD_LOCALE
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void imbue(const std::locale& loc);
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#endif
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private:
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InputFilter in_;
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OutputFilter out_;
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};
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template<typename In, typename Out>
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struct combination_traits
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: mpl::if_<
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is_device<In>,
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combined_device<
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typename wrapped_type<In>::type,
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typename wrapped_type<Out>::type
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>,
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combined_filter<
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typename wrapped_type<In>::type,
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typename wrapped_type<Out>::type
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>
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>
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{ };
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} // End namespace detail.
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template<typename In, typename Out>
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struct combination : detail::combination_traits<In, Out>::type {
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typedef typename detail::combination_traits<In, Out>::type base_type;
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typedef typename detail::wrapped_type<In>::type in_type;
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typedef typename detail::wrapped_type<Out>::type out_type;
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combination(const in_type& in, const out_type& out)
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: base_type(in, out) { }
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};
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namespace detail {
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// Workaround for VC6 ETI bug.
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template<typename In, typename Out>
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struct combine_traits {
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typedef combination<
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BOOST_DEDUCED_TYPENAME detail::unwrapped_type<In>::type,
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BOOST_DEDUCED_TYPENAME detail::unwrapped_type<Out>::type
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> type;
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};
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} // End namespace detail.
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//
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// Template name: combine.
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// Description: Takes a Source/Sink pair or InputFilter/OutputFilter pair and
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// returns a Source or Filter which performs input using the first member
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// of the pair and output using the second member of the pair.
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// Template parameters:
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// In - A model of Source or InputFilter, with the same char_type as Out.
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// Out - A model of Sink or OutputFilter, with the same char_type as In.
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//
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template<typename In, typename Out>
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typename detail::combine_traits<In, Out>::type
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combine(const In& in, const Out& out)
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{
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typedef typename detail::combine_traits<In, Out>::type return_type;
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return return_type(in, out);
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}
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//----------------------------------------------------------------------------//
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namespace detail {
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//--------------Implementation of combined_device-----------------------------//
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template<typename Source, typename Sink>
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inline combined_device<Source, Sink>::combined_device
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(const Source& src, const Sink& snk)
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: src_(src), sink_(snk) { }
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template<typename Source, typename Sink>
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inline std::streamsize
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combined_device<Source, Sink>::read(char_type* s, std::streamsize n)
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{ return iostreams::read(src_, s, n); }
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template<typename Source, typename Sink>
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inline std::streamsize
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combined_device<Source, Sink>::write(const char_type* s, std::streamsize n)
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{ return iostreams::write(sink_, s, n); }
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template<typename Source, typename Sink>
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inline void
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combined_device<Source, Sink>::close(BOOST_IOS::openmode which)
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{
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if (which == BOOST_IOS::in)
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detail::close_all(src_);
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if (which == BOOST_IOS::out)
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detail::close_all(sink_);
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}
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#ifndef BOOST_NO_STD_LOCALE
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template<typename Source, typename Sink>
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void combined_device<Source, Sink>::imbue(const std::locale& loc)
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{
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iostreams::imbue(src_, loc);
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iostreams::imbue(sink_, loc);
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}
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#endif
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//--------------Implementation of filter_pair---------------------------------//
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template<typename InputFilter, typename OutputFilter>
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inline combined_filter<InputFilter, OutputFilter>::combined_filter
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(const InputFilter& in, const OutputFilter& out) : in_(in), out_(out)
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{ }
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#ifndef BOOST_NO_STD_LOCALE
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template<typename InputFilter, typename OutputFilter>
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void combined_filter<InputFilter, OutputFilter>::imbue
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(const std::locale& loc)
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{
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iostreams::imbue(in_, loc);
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iostreams::imbue(out_, loc);
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}
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#endif
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} // End namespace detail.
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} } // End namespaces iostreams, boost.
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#include <boost/iostreams/detail/config/enable_warnings.hpp>
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#endif // #ifndef BOOST_IOSTREAMS_COMBINE_HPP_INCLUDED
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