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495 lines
18 KiB
C++
495 lines
18 KiB
C++
// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
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// (C) Copyright 2005-2007 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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// Note: bidirectional streams are not supported.
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#ifndef BOOST_IOSTREAMS_COMPOSE_HPP_INCLUDED
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#define BOOST_IOSTREAMS_COMPOSE_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 <algorithm> // min.
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#include <utility> // pair.
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#include <boost/config.hpp> // DEDUCED_TYPENAME.
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#include <boost/iostreams/categories.hpp>
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#include <boost/iostreams/detail/adapter/direct_adapter.hpp>
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#include <boost/iostreams/detail/call_traits.hpp>
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#include <boost/iostreams/detail/enable_if_stream.hpp>
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#include <boost/iostreams/detail/execute.hpp>
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#include <boost/iostreams/detail/functional.hpp>
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#include <boost/iostreams/operations.hpp>
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#include <boost/iostreams/traits.hpp> // mode_of, is_direct.
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#include <boost/mpl/if.hpp>
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#include <boost/ref.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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namespace detail {
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template< typename First,
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typename Second,
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typename FirstMode =
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BOOST_DEDUCED_TYPENAME mode_of<First>::type,
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typename SecondMode =
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BOOST_DEDUCED_TYPENAME mode_of<Second>::type >
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struct composite_mode
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: select<
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is_convertible<SecondMode, FirstMode>, FirstMode,
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is_convertible<FirstMode, SecondMode>, SecondMode,
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is_convertible<SecondMode, input>, input,
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else_, output
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>
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{ };
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//
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// Template name: composite_device.
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// Description: Provides a Device view of a Filter, Device pair.
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// Template parameters:
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// Filter - A model of Filter.
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// Device - An indirect model of Device.
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//
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template< typename Filter,
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typename Device,
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typename Mode =
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BOOST_DEDUCED_TYPENAME composite_mode<Filter, Device>::type >
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class composite_device {
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private:
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typedef typename detail::param_type<Device>::type param_type;
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typedef typename mode_of<Filter>::type filter_mode;
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typedef typename mode_of<Device>::type device_mode;
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typedef typename
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iostreams::select< // Disambiguation for Tru64.
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is_direct<Device>, direct_adapter<Device>,
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is_std_io<Device>, Device&,
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else_, Device
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>::type value_type;
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BOOST_STATIC_ASSERT(is_filter<Filter>::value);
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BOOST_STATIC_ASSERT(is_device<Device>::value);
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public:
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typedef typename char_type_of<Filter>::type char_type;
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struct category
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: Mode,
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device_tag,
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closable_tag,
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flushable_tag,
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localizable_tag,
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optimally_buffered_tag
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{ };
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composite_device(const Filter& flt, param_type dev);
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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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std::streampos seek( stream_offset off, BOOST_IOS::seekdir way,
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BOOST_IOS::openmode which =
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BOOST_IOS::in | BOOST_IOS::out );
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void close();
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void close(BOOST_IOS::openmode which);
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bool flush();
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std::streamsize optimal_buffer_size() const;
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template<typename Locale> // Avoid dependency on <locale>
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void imbue(const Locale& loc)
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{
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iostreams::imbue(filter_, loc);
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iostreams::imbue(device_, loc);
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}
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Filter& first() { return filter_; }
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Device& second() { return device_; }
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private:
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Filter filter_;
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value_type device_;
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};
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//
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// Template name: composite_device.
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// Description: Provides a Device view of a Filter, Device pair.
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// Template parameters:
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// Filter - A model of Filter.
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// Device - An indirect model of Device.
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//
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template< typename Filter1,
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typename Filter2,
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typename Mode =
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BOOST_DEDUCED_TYPENAME composite_mode<Filter1, Filter2>::type >
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class composite_filter {
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private:
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typedef reference_wrapper<Filter2> filter_ref;
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typedef typename mode_of<Filter1>::type first_mode;
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typedef typename mode_of<Filter2>::type second_mode;
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// A dual-use filter cannot be composed with a read-write filter
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BOOST_STATIC_ASSERT(
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!(is_convertible<first_mode, dual_use>::value) ||
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!(is_convertible<second_mode, input>::value) ||
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!(is_convertible<second_mode, output>::value) ||
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(is_convertible<second_mode, dual_use>::value)
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);
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BOOST_STATIC_ASSERT(
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!(is_convertible<second_mode, dual_use>::value) ||
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!(is_convertible<first_mode, input>::value) ||
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!(is_convertible<first_mode, output>::value) ||
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(is_convertible<first_mode, dual_use>::value)
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);
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BOOST_STATIC_ASSERT(is_filter<Filter1>::value);
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BOOST_STATIC_ASSERT(is_filter<Filter2>::value);
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public:
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typedef typename char_type_of<Filter1>::type char_type;
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struct category
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: Mode,
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filter_tag,
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multichar_tag,
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closable_tag,
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flushable_tag,
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localizable_tag,
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optimally_buffered_tag
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{ };
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composite_filter(const Filter1& filter1, const Filter2& filter2)
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: filter1_(filter1), filter2_(filter2)
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{ }
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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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{
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composite_device<filter_ref, Source> cmp(boost::ref(filter2_), src);
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return iostreams::read(filter1_, cmp, s, n);
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}
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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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{
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composite_device<filter_ref, Sink> cmp(boost::ref(filter2_), snk);
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return iostreams::write(filter1_, cmp, s, n);
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}
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template<typename Device>
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std::streampos seek( Device& dev, stream_offset off, BOOST_IOS::seekdir way,
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BOOST_IOS::openmode which =
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BOOST_IOS::in | BOOST_IOS::out )
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{
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composite_device<filter_ref, Device> cmp(boost::ref(filter2_), dev);
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return iostreams::seek(filter1_, cmp, off, way, which);
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}
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template<typename Device>
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void close(Device& dev)
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{
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BOOST_STATIC_ASSERT((!is_convertible<category, two_sequence>::value));
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BOOST_STATIC_ASSERT((!is_convertible<category, dual_use>::value));
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// Create a new device by composing the second filter2_ with dev.
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composite_device<filter_ref, Device> cmp(boost::ref(filter2_), dev);
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// Close input sequences in reverse order and output sequences in
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// forward order
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if (!is_convertible<first_mode, dual_use>::value) {
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detail::execute_all(
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detail::call_close(filter2_, dev, BOOST_IOS::in),
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detail::call_close(filter1_, cmp, BOOST_IOS::in),
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detail::call_close(filter1_, cmp, BOOST_IOS::out),
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detail::call_close(filter2_, dev, BOOST_IOS::out)
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);
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} else if (is_convertible<second_mode, input>::value) {
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detail::execute_all(
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detail::call_close(filter2_, dev, BOOST_IOS::in),
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detail::call_close(filter1_, cmp, BOOST_IOS::in)
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);
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} else {
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detail::execute_all(
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detail::call_close(filter1_, cmp, BOOST_IOS::out),
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detail::call_close(filter2_, dev, BOOST_IOS::out)
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);
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}
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}
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template<typename Device>
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void close(Device& dev, BOOST_IOS::openmode which)
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{
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BOOST_STATIC_ASSERT(
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(is_convertible<category, two_sequence>::value) ||
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(is_convertible<category, dual_use>::value)
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);
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// Create a new device by composing the second filter2_ with dev.
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composite_device<filter_ref, Device> cmp(boost::ref(filter2_), dev);
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// Close input sequences in reverse order
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if ( which == BOOST_IOS::in &&
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( !is_convertible<first_mode, dual_use>::value ||
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is_convertible<second_mode, input>::value ) )
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{
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detail::execute_all(
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detail::call_close(filter2_, dev, BOOST_IOS::in),
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detail::call_close(filter1_, cmp, BOOST_IOS::in)
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);
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}
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// Close output sequences in forward order
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if ( which == BOOST_IOS::out &&
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( !is_convertible<first_mode, dual_use>::value ||
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is_convertible<second_mode, output>::value ) )
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{
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detail::execute_all(
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detail::call_close(filter1_, cmp, BOOST_IOS::out),
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detail::call_close(filter2_, dev, BOOST_IOS::out)
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);
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}
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}
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template<typename Device>
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bool flush(Device& dev)
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{
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composite_device<Filter2, Device> cmp(filter2_, dev);
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return iostreams::flush(filter1_, cmp);
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}
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std::streamsize optimal_buffer_size() const
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{
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std::streamsize first = iostreams::optimal_buffer_size(filter1_);
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std::streamsize second = iostreams::optimal_buffer_size(filter2_);
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return first < second ? second : first;
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}
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template<typename Locale> // Avoid dependency on <locale>
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void imbue(const Locale& loc)
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{ // To do: consider using RAII.
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iostreams::imbue(filter1_, loc);
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iostreams::imbue(filter2_, loc);
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}
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Filter1& first() { return filter1_; }
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Filter2& second() { return filter2_; }
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private:
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Filter1 filter1_;
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Filter2 filter2_;
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};
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template<typename Filter, typename FilterOrDevice>
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struct composite_traits
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: mpl::if_<
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is_device<FilterOrDevice>,
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composite_device<Filter, FilterOrDevice>,
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composite_filter<Filter, FilterOrDevice>
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>
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{ };
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} // End namespace detail.
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template<typename Filter, typename FilterOrDevice>
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struct composite : detail::composite_traits<Filter, FilterOrDevice>::type {
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typedef typename detail::param_type<FilterOrDevice>::type param_type;
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typedef typename detail::composite_traits<Filter, FilterOrDevice>::type base;
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composite(const Filter& flt, param_type dev)
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: base(flt, dev)
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{ }
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};
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//--------------Implementation of compose-------------------------------------//
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// Note: The following workarounds are patterned after resolve.hpp. It has not
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// yet been confirmed that they are necessary.
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#ifndef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION //-------------------------//
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# ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //-------------------------------//
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template<typename Filter, typename FilterOrDevice>
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composite<Filter, FilterOrDevice>
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compose( const Filter& filter, const FilterOrDevice& fod
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BOOST_IOSTREAMS_DISABLE_IF_STREAM(FilterOrDevice) )
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{ return composite<Filter, FilterOrDevice>(filter, fod); }
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template<typename Filter, typename Ch, typename Tr>
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composite< Filter, std::basic_streambuf<Ch, Tr> >
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compose(const Filter& filter, std::basic_streambuf<Ch, Tr>& sb)
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{ return composite< Filter, std::basic_streambuf<Ch, Tr> >(filter, sb); }
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template<typename Filter, typename Ch, typename Tr>
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composite< Filter, std::basic_istream<Ch, Tr> >
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compose(const Filter& filter, std::basic_istream<Ch, Tr>& is)
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{ return composite< Filter, std::basic_istream<Ch, Tr> >(filter, is); }
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template<typename Filter, typename Ch, typename Tr>
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composite< Filter, std::basic_ostream<Ch, Tr> >
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compose(const Filter& filter, std::basic_ostream<Ch, Tr>& os)
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{ return composite< Filter, std::basic_ostream<Ch, Tr> >(filter, os); }
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template<typename Filter, typename Ch, typename Tr>
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composite< Filter, std::basic_iostream<Ch, Tr> >
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compose(const Filter& filter, std::basic_iostream<Ch, Tr>& io)
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{ return composite< Filter, std::basic_iostream<Ch, Tr> >(filter, io); }
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# else // # ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //---------------------//
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template<typename Filter, typename FilterOrDevice>
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composite<Filter, FilterOrDevice>
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compose( const Filter& filter, const FilterOrDevice& fod
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BOOST_IOSTREAMS_DISABLE_IF_STREAM(FilterOrDevice) )
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{ return composite<Filter, FilterOrDevice>(filter, fod); }
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template<typename Filter>
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composite<Filter, std::streambuf>
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compose(const Filter& filter, std::streambuf& sb)
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{ return composite<Filter, std::streambuf>(filter, sb); }
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template<typename Filter>
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composite<Filter, std::istream>
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compose(const Filter& filter, std::istream& is)
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{ return composite<Filter, std::istream>(filter, is); }
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template<typename Filter>
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composite<Filter, std::ostream>
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compose(const Filter& filter, std::ostream& os)
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{ return composite<Filter, std::ostream>(filter, os); }
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template<typename Filter>
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composite<Filter, std::iostream>
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compose(const Filter& filter, std::iostream& io)
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{ return composite<Filter, std::iostream>(filter, io); }
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# endif // # ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //--------------------//
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#else // #ifndef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION //----------------//
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template<typename Filter, typename Stream>
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composite<Filter, Stream>
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compose(const Filter& flt, const Stream& strm, mpl::true_)
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{ // Bad overload resolution.
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return composite<Filter, Stream>(flt, const_cast<Stream&>(strm));
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}
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template<typename Filter, typename FilterOrDevice>
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composite<Filter, FilterOrDevice>
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compose(const Filter& flt, const FilterOrDevice& fod, mpl::false_)
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{ return composite<Filter, FilterOrDevice>(flt, fod); }
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template<typename Filter, typename FilterOrDevice>
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composite<Filter, FilterOrDevice>
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compose( const Filter& flt, const FilterOrDevice& fod
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BOOST_IOSTREAMS_DISABLE_IF_STREAM(T) )
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{ return compose(flt, fod, is_std_io<FilterOrDevice>()); }
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# if !BOOST_WORKAROUND(__BORLANDC__, < 0x600) && \
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!BOOST_WORKAROUND(BOOST_MSVC, <= 1300) && \
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!defined(__GNUC__) // ---------------------------------------------------//
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template<typename Filter, typename FilterOrDevice>
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composite<Filter, FilterOrDevice>
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compose (const Filter& filter, FilterOrDevice& fod)
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{ return composite<Filter, FilterOrDevice>(filter, fod); }
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# endif // Borland 5.x, VC6-7.0 or GCC 2.9x //--------------------------------//
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#endif // #ifndef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION //---------------//
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//----------------------------------------------------------------------------//
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namespace detail {
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//--------------Implementation of composite_device---------------------------//
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template<typename Filter, typename Device, typename Mode>
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composite_device<Filter, Device, Mode>::composite_device
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(const Filter& flt, param_type dev)
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: filter_(flt), device_(dev)
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{ }
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template<typename Filter, typename Device, typename Mode>
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inline std::streamsize composite_device<Filter, Device, Mode>::read
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(char_type* s, std::streamsize n)
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{ return iostreams::read(filter_, device_, s, n); }
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template<typename Filter, typename Device, typename Mode>
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inline std::streamsize composite_device<Filter, Device, Mode>::write
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(const char_type* s, std::streamsize n)
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{ return iostreams::write(filter_, device_, s, n); }
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template<typename Filter, typename Device, typename Mode>
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std::streampos composite_device<Filter, Device, Mode>::seek
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(stream_offset off, BOOST_IOS::seekdir way, BOOST_IOS::openmode which)
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{ return iostreams::seek(filter_, device_, off, way, which); }
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template<typename Filter, typename Device, typename Mode>
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void composite_device<Filter, Device, Mode>::close()
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{
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BOOST_STATIC_ASSERT((!is_convertible<Mode, two_sequence>::value));
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BOOST_STATIC_ASSERT(
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!(is_convertible<filter_mode, dual_use>::value) ||
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!(is_convertible<device_mode, input>::value) ||
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!(is_convertible<device_mode, output>::value)
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);
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// Close input sequences in reverse order and output sequences
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// in forward order
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if (!is_convertible<filter_mode, dual_use>::value) {
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detail::execute_all(
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detail::call_close(device_, BOOST_IOS::in),
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detail::call_close(filter_, device_, BOOST_IOS::in),
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detail::call_close(filter_, device_, BOOST_IOS::out),
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detail::call_close(device_, BOOST_IOS::out)
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);
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} else if (is_convertible<device_mode, input>::value) {
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detail::execute_all(
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detail::call_close(device_, BOOST_IOS::in),
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detail::call_close(filter_, device_, BOOST_IOS::in)
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);
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} else {
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detail::execute_all(
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detail::call_close(filter_, device_, BOOST_IOS::out),
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detail::call_close(device_, BOOST_IOS::out)
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);
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}
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}
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template<typename Filter, typename Device, typename Mode>
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void composite_device<Filter, Device, Mode>::close(BOOST_IOS::openmode which)
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{
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BOOST_STATIC_ASSERT((is_convertible<Mode, two_sequence>::value));
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BOOST_STATIC_ASSERT(!(is_convertible<filter_mode, dual_use>::value));
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// Close input sequences in reverse order
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if (which == BOOST_IOS::in) {
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detail::execute_all(
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detail::call_close(device_, BOOST_IOS::in),
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detail::call_close(filter_, device_, BOOST_IOS::in)
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);
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}
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// Close output sequences in forward order
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if (which == BOOST_IOS::out) {
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detail::execute_all(
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detail::call_close(filter_, device_, BOOST_IOS::out),
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detail::call_close(device_, BOOST_IOS::out)
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);
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}
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}
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template<typename Filter, typename Device, typename Mode>
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bool composite_device<Filter, Device, Mode>::flush()
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{
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bool r1 = iostreams::flush(filter_, device_);
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bool r2 = iostreams::flush(device_);
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return r1 && r2;
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}
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template<typename Filter, typename Device, typename Mode>
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std::streamsize
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composite_device<Filter, Device, Mode>::optimal_buffer_size() const
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{ return iostreams::optimal_buffer_size(device_); }
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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_COMPOSE_HPP_INCLUDED
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