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494 lines
18 KiB
494 lines
18 KiB
// (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 paramters: |
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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 paramters: |
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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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