Chris@16: // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
Chris@16: // (C) Copyright 2005-2007 Jonathan Turkanis
Chris@16: // Distributed under the Boost Software License, Version 1.0. (See accompanying
Chris@16: // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
Chris@16: 
Chris@16: // See http://www.boost.org/libs/iostreams for documentation.
Chris@16: 
Chris@16: // Note: bidirectional streams are not supported.
Chris@16: 
Chris@16: #ifndef BOOST_IOSTREAMS_COMPOSE_HPP_INCLUDED
Chris@16: #define BOOST_IOSTREAMS_COMPOSE_HPP_INCLUDED
Chris@16: 
Chris@16: #if defined(_MSC_VER) && (_MSC_VER >= 1020)
Chris@16: # pragma once
Chris@16: #endif
Chris@16: 
Chris@16: #include <algorithm>          // min.
Chris@16: #include <utility>            // pair.
Chris@16: #include <boost/config.hpp>   // DEDUCED_TYPENAME.
Chris@16: #include <boost/iostreams/categories.hpp>
Chris@16: #include <boost/iostreams/detail/adapter/direct_adapter.hpp>
Chris@16: #include <boost/iostreams/detail/call_traits.hpp>
Chris@16: #include <boost/iostreams/detail/enable_if_stream.hpp>
Chris@16: #include <boost/iostreams/detail/execute.hpp>
Chris@16: #include <boost/iostreams/detail/functional.hpp>
Chris@16: #include <boost/iostreams/operations.hpp>
Chris@16: #include <boost/iostreams/traits.hpp>      // mode_of, is_direct.
Chris@16: #include <boost/mpl/if.hpp>
Chris@16: #include <boost/ref.hpp>
Chris@16: #include <boost/static_assert.hpp>
Chris@16: #include <boost/type_traits/is_convertible.hpp>
Chris@16: 
Chris@16: // Must come last.
Chris@16: #include <boost/iostreams/detail/config/disable_warnings.hpp>  // MSVC.
Chris@16: 
Chris@16: namespace boost { namespace iostreams {
Chris@16: 
Chris@16: namespace detail {
Chris@16: 
Chris@16: template< typename First, 
Chris@16:           typename Second,
Chris@16:           typename FirstMode = 
Chris@16:               BOOST_DEDUCED_TYPENAME mode_of<First>::type,
Chris@16:           typename SecondMode = 
Chris@16:               BOOST_DEDUCED_TYPENAME mode_of<Second>::type >
Chris@16: struct composite_mode
Chris@16:     : select<
Chris@16:           is_convertible<SecondMode, FirstMode>, FirstMode,
Chris@16:           is_convertible<FirstMode, SecondMode>, SecondMode,
Chris@16:           is_convertible<SecondMode, input>,     input,
Chris@16:           else_,                                 output
Chris@16:       >
Chris@16:     { };
Chris@16: 
Chris@16: //
Chris@16: // Template name: composite_device.
Chris@16: // Description: Provides a Device view of a Filter, Device pair.
Chris@16: // Template parameters:
Chris@16: //      Filter - A model of Filter.
Chris@16: //      Device - An indirect model of Device.
Chris@16: //
Chris@16: template< typename Filter,
Chris@16:           typename Device,
Chris@16:           typename Mode =
Chris@16:               BOOST_DEDUCED_TYPENAME composite_mode<Filter, Device>::type >
Chris@16: class composite_device {
Chris@16: private:
Chris@16:     typedef typename detail::param_type<Device>::type       param_type;
Chris@16:     typedef typename mode_of<Filter>::type                  filter_mode;
Chris@16:     typedef typename mode_of<Device>::type                  device_mode;
Chris@16:     typedef typename
Chris@16:             iostreams::select<  // Disambiguation for Tru64.
Chris@16:                 is_direct<Device>,  direct_adapter<Device>,
Chris@16:                 is_std_io<Device>,  Device&,
Chris@16:                 else_,              Device
Chris@16:             >::type                                         value_type;
Chris@16:     BOOST_STATIC_ASSERT(is_filter<Filter>::value);
Chris@16:     BOOST_STATIC_ASSERT(is_device<Device>::value);
Chris@16: public:
Chris@16:     typedef typename char_type_of<Filter>::type             char_type;
Chris@16:     struct category
Chris@16:         : Mode,
Chris@16:           device_tag,
Chris@16:           closable_tag,
Chris@16:           flushable_tag,
Chris@16:           localizable_tag,
Chris@16:           optimally_buffered_tag
Chris@16:         { };
Chris@16:     composite_device(const Filter& flt, param_type dev);
Chris@16:     std::streamsize read(char_type* s, std::streamsize n);
Chris@16:     std::streamsize write(const char_type* s, std::streamsize n);
Chris@16:     std::streampos seek( stream_offset off, BOOST_IOS::seekdir way,
Chris@16:                          BOOST_IOS::openmode which =
Chris@16:                              BOOST_IOS::in | BOOST_IOS::out );
Chris@16: 
Chris@16:     void close();
Chris@16:     void close(BOOST_IOS::openmode which);
Chris@16:     bool flush();
Chris@16:     std::streamsize optimal_buffer_size() const;
Chris@16: 
Chris@16:     template<typename Locale> // Avoid dependency on <locale>
Chris@16:     void imbue(const Locale& loc)
Chris@16:     {
Chris@16:         iostreams::imbue(filter_, loc);
Chris@16:         iostreams::imbue(device_, loc);
Chris@16:     }
Chris@16: 
Chris@16:     Filter& first() { return filter_; }
Chris@16:     Device& second() { return device_; }
Chris@16: private:
Chris@16:     Filter      filter_;
Chris@16:     value_type  device_;
Chris@16: };
Chris@16: 
Chris@16: //
Chris@16: // Template name: composite_device.
Chris@16: // Description: Provides a Device view of a Filter, Device pair.
Chris@16: // Template parameters:
Chris@16: //      Filter - A model of Filter.
Chris@16: //      Device - An indirect model of Device.
Chris@16: //
Chris@16: template< typename Filter1, 
Chris@16:           typename Filter2,
Chris@16:           typename Mode =
Chris@16:               BOOST_DEDUCED_TYPENAME composite_mode<Filter1, Filter2>::type >
Chris@16: class composite_filter {
Chris@16: private:
Chris@16:     typedef reference_wrapper<Filter2>           filter_ref;
Chris@16:     typedef typename mode_of<Filter1>::type      first_mode;
Chris@16:     typedef typename mode_of<Filter2>::type      second_mode;
Chris@16: 
Chris@16:     // A dual-use filter cannot be composed with a read-write filter
Chris@16:     BOOST_STATIC_ASSERT(
Chris@16:         !(is_convertible<first_mode, dual_use>::value) ||
Chris@16:         !(is_convertible<second_mode, input>::value) ||
Chris@16:         !(is_convertible<second_mode, output>::value) ||
Chris@16:          (is_convertible<second_mode, dual_use>::value)
Chris@16:     );
Chris@16:     BOOST_STATIC_ASSERT(
Chris@16:         !(is_convertible<second_mode, dual_use>::value) ||
Chris@16:         !(is_convertible<first_mode, input>::value) ||
Chris@16:         !(is_convertible<first_mode, output>::value) ||
Chris@16:          (is_convertible<first_mode, dual_use>::value)
Chris@16:     );
Chris@16:     BOOST_STATIC_ASSERT(is_filter<Filter1>::value);
Chris@16:     BOOST_STATIC_ASSERT(is_filter<Filter2>::value);
Chris@16: public:
Chris@16:     typedef typename char_type_of<Filter1>::type  char_type;
Chris@16:     struct category
Chris@16:         : Mode,
Chris@16:           filter_tag,
Chris@16:           multichar_tag,
Chris@16:           closable_tag,
Chris@16:           flushable_tag,
Chris@16:           localizable_tag,
Chris@16:           optimally_buffered_tag
Chris@16:         { };
Chris@16:     composite_filter(const Filter1& filter1, const Filter2& filter2)
Chris@16:         : filter1_(filter1), filter2_(filter2)
Chris@16:         { }
Chris@16: 
Chris@16:     template<typename Source>
Chris@16:     std::streamsize read(Source& src, char_type* s, std::streamsize n)
Chris@16:     {
Chris@16:         composite_device<filter_ref, Source> cmp(boost::ref(filter2_), src);
Chris@16:         return iostreams::read(filter1_, cmp, s, n);
Chris@16:     }
Chris@16: 
Chris@16:     template<typename Sink>
Chris@16:     std::streamsize write(Sink& snk, const char_type* s, std::streamsize n)
Chris@16:     {
Chris@16:         composite_device<filter_ref, Sink> cmp(boost::ref(filter2_), snk);
Chris@16:         return iostreams::write(filter1_, cmp, s, n);
Chris@16:     }
Chris@16: 
Chris@16:     template<typename Device>
Chris@16:     std::streampos seek( Device& dev, stream_offset off, BOOST_IOS::seekdir way,
Chris@16:                          BOOST_IOS::openmode which =
Chris@16:                              BOOST_IOS::in | BOOST_IOS::out )
Chris@16:     {
Chris@16:         composite_device<filter_ref, Device> cmp(boost::ref(filter2_), dev);
Chris@16:         return iostreams::seek(filter1_, cmp, off, way, which);
Chris@16:     }
Chris@16: 
Chris@16:     template<typename Device>
Chris@16:     void close(Device& dev)
Chris@16:     {
Chris@16:         BOOST_STATIC_ASSERT((!is_convertible<category, two_sequence>::value));
Chris@16:         BOOST_STATIC_ASSERT((!is_convertible<category, dual_use>::value));
Chris@16: 
Chris@16:         // Create a new device by composing the second filter2_ with dev.
Chris@16:         composite_device<filter_ref, Device> cmp(boost::ref(filter2_), dev);
Chris@16: 
Chris@16:         // Close input sequences in reverse order and output sequences in 
Chris@16:         // forward order
Chris@16:         if (!is_convertible<first_mode, dual_use>::value) {
Chris@16:             detail::execute_all(
Chris@16:                 detail::call_close(filter2_, dev, BOOST_IOS::in),
Chris@16:                 detail::call_close(filter1_, cmp, BOOST_IOS::in),
Chris@16:                 detail::call_close(filter1_, cmp, BOOST_IOS::out),
Chris@16:                 detail::call_close(filter2_, dev, BOOST_IOS::out)
Chris@16:             );
Chris@16:         } else if (is_convertible<second_mode, input>::value) {
Chris@16:             detail::execute_all(
Chris@16:                 detail::call_close(filter2_, dev, BOOST_IOS::in),
Chris@16:                 detail::call_close(filter1_, cmp, BOOST_IOS::in)
Chris@16:             );
Chris@16:         } else {
Chris@16:             detail::execute_all(
Chris@16:                 detail::call_close(filter1_, cmp, BOOST_IOS::out),
Chris@16:                 detail::call_close(filter2_, dev, BOOST_IOS::out)
Chris@16:             );
Chris@16:         }
Chris@16:     }
Chris@16: 
Chris@16:     template<typename Device>
Chris@16:     void close(Device& dev, BOOST_IOS::openmode which)
Chris@16:     {
Chris@16:         BOOST_STATIC_ASSERT(
Chris@16:             (is_convertible<category, two_sequence>::value) ||
Chris@16:             (is_convertible<category, dual_use>::value)
Chris@16:         );
Chris@16: 
Chris@16:         // Create a new device by composing the second filter2_ with dev.
Chris@16:         composite_device<filter_ref, Device> cmp(boost::ref(filter2_), dev);
Chris@16: 
Chris@16:         // Close input sequences in reverse order
Chris@16:         if ( which == BOOST_IOS::in &&
Chris@16:              ( !is_convertible<first_mode, dual_use>::value ||
Chris@16:                 is_convertible<second_mode, input>::value ) )
Chris@16:         {
Chris@16:             detail::execute_all(
Chris@16:                 detail::call_close(filter2_, dev, BOOST_IOS::in),
Chris@16:                 detail::call_close(filter1_, cmp, BOOST_IOS::in)
Chris@16:             );
Chris@16:         }
Chris@16: 
Chris@16:         // Close output sequences in forward order
Chris@16:         if ( which == BOOST_IOS::out &&
Chris@16:              ( !is_convertible<first_mode, dual_use>::value ||
Chris@16:                 is_convertible<second_mode, output>::value ) )
Chris@16:         {
Chris@16:             detail::execute_all(
Chris@16:                 detail::call_close(filter1_, cmp, BOOST_IOS::out),
Chris@16:                 detail::call_close(filter2_, dev, BOOST_IOS::out)
Chris@16:             );
Chris@16:         }
Chris@16:     }
Chris@16: 
Chris@16:     template<typename Device>
Chris@16:     bool flush(Device& dev)
Chris@16:     {
Chris@16:         composite_device<Filter2, Device> cmp(filter2_, dev);
Chris@16:         return iostreams::flush(filter1_, cmp);
Chris@16:     }
Chris@16: 
Chris@16:     std::streamsize optimal_buffer_size() const
Chris@16:     {
Chris@16:         std::streamsize first = iostreams::optimal_buffer_size(filter1_);
Chris@16:         std::streamsize second = iostreams::optimal_buffer_size(filter2_);
Chris@16:         return first < second ? second : first;
Chris@16:     }
Chris@16: 
Chris@16:     template<typename Locale> // Avoid dependency on <locale>
Chris@16:     void imbue(const Locale& loc)
Chris@16:     {   // To do: consider using RAII.
Chris@16:         iostreams::imbue(filter1_, loc);
Chris@16:         iostreams::imbue(filter2_, loc);
Chris@16:     }
Chris@16: 
Chris@16:     Filter1& first() { return filter1_; }
Chris@16:     Filter2& second() { return filter2_; }
Chris@16: private:
Chris@16:     Filter1  filter1_;
Chris@16:     Filter2  filter2_;
Chris@16: };
Chris@16: 
Chris@16: template<typename Filter, typename FilterOrDevice>
Chris@16: struct composite_traits
Chris@16:     : mpl::if_<
Chris@16:           is_device<FilterOrDevice>,
Chris@16:           composite_device<Filter, FilterOrDevice>,
Chris@16:           composite_filter<Filter, FilterOrDevice>
Chris@16:       >
Chris@16:     { };
Chris@16: 
Chris@16: } // End namespace detail.
Chris@16: 
Chris@16: template<typename Filter, typename FilterOrDevice>
Chris@16: struct composite : detail::composite_traits<Filter, FilterOrDevice>::type {
Chris@16:     typedef typename detail::param_type<FilterOrDevice>::type param_type;
Chris@16:     typedef typename detail::composite_traits<Filter, FilterOrDevice>::type base;
Chris@16:     composite(const Filter& flt, param_type dev)
Chris@16:         : base(flt, dev)
Chris@16:         { }
Chris@16: };
Chris@16: 
Chris@16: //--------------Implementation of compose-------------------------------------//
Chris@16: 
Chris@16: // Note: The following workarounds are patterned after resolve.hpp. It has not
Chris@16: // yet been confirmed that they are necessary.
Chris@16: 
Chris@16: #ifndef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION //-------------------------//
Chris@16: # ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //-------------------------------//
Chris@16: 
Chris@16: template<typename Filter, typename FilterOrDevice>
Chris@16: composite<Filter, FilterOrDevice>
Chris@16: compose( const Filter& filter, const FilterOrDevice& fod
Chris@16:          BOOST_IOSTREAMS_DISABLE_IF_STREAM(FilterOrDevice) )
Chris@16: { return composite<Filter, FilterOrDevice>(filter, fod); }
Chris@16: 
Chris@16: template<typename Filter, typename Ch, typename Tr>
Chris@16: composite< Filter, std::basic_streambuf<Ch, Tr> >
Chris@16: compose(const Filter& filter, std::basic_streambuf<Ch, Tr>& sb)
Chris@16: { return composite< Filter, std::basic_streambuf<Ch, Tr> >(filter, sb); }
Chris@16: 
Chris@16: template<typename Filter, typename Ch, typename Tr>
Chris@16: composite< Filter, std::basic_istream<Ch, Tr> >
Chris@16: compose(const Filter& filter, std::basic_istream<Ch, Tr>& is)
Chris@16: { return composite< Filter, std::basic_istream<Ch, Tr> >(filter, is); }
Chris@16: 
Chris@16: template<typename Filter, typename Ch, typename Tr>
Chris@16: composite< Filter, std::basic_ostream<Ch, Tr> >
Chris@16: compose(const Filter& filter, std::basic_ostream<Ch, Tr>& os)
Chris@16: { return composite< Filter, std::basic_ostream<Ch, Tr> >(filter, os); }
Chris@16: 
Chris@16: template<typename Filter, typename Ch, typename Tr>
Chris@16: composite< Filter, std::basic_iostream<Ch, Tr> >
Chris@16: compose(const Filter& filter, std::basic_iostream<Ch, Tr>& io)
Chris@16: { return composite< Filter, std::basic_iostream<Ch, Tr> >(filter, io); }
Chris@16: 
Chris@16: # else // # ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //---------------------//
Chris@16: 
Chris@16: template<typename Filter, typename FilterOrDevice>
Chris@16: composite<Filter, FilterOrDevice>
Chris@16: compose( const Filter& filter, const FilterOrDevice& fod
Chris@16:          BOOST_IOSTREAMS_DISABLE_IF_STREAM(FilterOrDevice) )
Chris@16: { return composite<Filter, FilterOrDevice>(filter, fod); }
Chris@16: 
Chris@16: template<typename Filter>
Chris@16: composite<Filter, std::streambuf>
Chris@16: compose(const Filter& filter, std::streambuf& sb)
Chris@16: { return composite<Filter, std::streambuf>(filter, sb); }
Chris@16: 
Chris@16: template<typename Filter>
Chris@16: composite<Filter, std::istream>
Chris@16: compose(const Filter& filter, std::istream& is)
Chris@16: { return composite<Filter, std::istream>(filter, is); }
Chris@16: 
Chris@16: template<typename Filter>
Chris@16: composite<Filter, std::ostream>
Chris@16: compose(const Filter& filter, std::ostream& os)
Chris@16: { return composite<Filter, std::ostream>(filter, os); }
Chris@16: 
Chris@16: template<typename Filter>
Chris@16: composite<Filter, std::iostream>
Chris@16: compose(const Filter& filter, std::iostream& io)
Chris@16: { return composite<Filter, std::iostream>(filter, io); }
Chris@16: 
Chris@16: # endif // # ifndef BOOST_IOSTREAMS_NO_STREAM_TEMPLATES //--------------------//
Chris@16: #else // #ifndef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION //----------------//
Chris@16: 
Chris@16: template<typename Filter, typename Stream>
Chris@16: composite<Filter, Stream>
Chris@16: compose(const Filter& flt, const Stream& strm, mpl::true_)
Chris@16: {   // Bad overload resolution.
Chris@16:     return composite<Filter, Stream>(flt, const_cast<Stream&>(strm));
Chris@16: }
Chris@16: 
Chris@16: template<typename Filter, typename FilterOrDevice>
Chris@16: composite<Filter, FilterOrDevice>
Chris@16: compose(const Filter& flt, const FilterOrDevice& fod, mpl::false_)
Chris@16: { return composite<Filter, FilterOrDevice>(flt, fod); }
Chris@16: 
Chris@16: template<typename Filter, typename FilterOrDevice>
Chris@16: composite<Filter, FilterOrDevice>
Chris@16: compose( const Filter& flt, const FilterOrDevice& fod
Chris@16:          BOOST_IOSTREAMS_DISABLE_IF_STREAM(T) )
Chris@16: { return compose(flt, fod, is_std_io<FilterOrDevice>()); }
Chris@16: 
Chris@16: # if !BOOST_WORKAROUND(__BORLANDC__, < 0x600) && \
Chris@16:      !BOOST_WORKAROUND(BOOST_MSVC, <= 1300) && \
Chris@16:      !defined(__GNUC__) // ---------------------------------------------------//
Chris@16: 
Chris@16: template<typename Filter, typename FilterOrDevice>
Chris@16: composite<Filter, FilterOrDevice>
Chris@16: compose (const Filter& filter, FilterOrDevice& fod)
Chris@16: { return composite<Filter, FilterOrDevice>(filter, fod); }
Chris@16: 
Chris@16: # endif // Borland 5.x, VC6-7.0 or GCC 2.9x //--------------------------------//
Chris@16: #endif // #ifndef BOOST_IOSTREAMS_BROKEN_OVERLOAD_RESOLUTION //---------------//
Chris@16: 
Chris@16: //----------------------------------------------------------------------------//
Chris@16: 
Chris@16: namespace detail {
Chris@16: 
Chris@16: //--------------Implementation of composite_device---------------------------//
Chris@16: 
Chris@16: template<typename Filter, typename Device, typename Mode>
Chris@16: composite_device<Filter, Device, Mode>::composite_device
Chris@16:     (const Filter& flt, param_type dev)
Chris@16:     : filter_(flt), device_(dev)
Chris@16:     { }
Chris@16: 
Chris@16: template<typename Filter, typename Device, typename Mode>
Chris@16: inline std::streamsize composite_device<Filter, Device, Mode>::read
Chris@16:     (char_type* s, std::streamsize n)
Chris@16: { return iostreams::read(filter_, device_, s, n); }
Chris@16: 
Chris@16: template<typename Filter, typename Device, typename Mode>
Chris@16: inline std::streamsize composite_device<Filter, Device, Mode>::write
Chris@16:     (const char_type* s, std::streamsize n)
Chris@16: { return iostreams::write(filter_, device_, s, n); }
Chris@16: 
Chris@16: template<typename Filter, typename Device, typename Mode>
Chris@16: std::streampos composite_device<Filter, Device, Mode>::seek
Chris@16:     (stream_offset off, BOOST_IOS::seekdir way, BOOST_IOS::openmode which)
Chris@16: { return iostreams::seek(filter_, device_, off, way, which); }
Chris@16: 
Chris@16: template<typename Filter, typename Device, typename Mode>
Chris@16: void composite_device<Filter, Device, Mode>::close()
Chris@16: {
Chris@16:     BOOST_STATIC_ASSERT((!is_convertible<Mode, two_sequence>::value));
Chris@16:     BOOST_STATIC_ASSERT(
Chris@16:         !(is_convertible<filter_mode, dual_use>::value) ||
Chris@16:         !(is_convertible<device_mode, input>::value) ||
Chris@16:         !(is_convertible<device_mode, output>::value)
Chris@16:     );
Chris@16: 
Chris@16:     // Close input sequences in reverse order and output sequences 
Chris@16:     // in forward order
Chris@16:     if (!is_convertible<filter_mode, dual_use>::value) {
Chris@16:         detail::execute_all(
Chris@16:             detail::call_close(device_, BOOST_IOS::in),
Chris@16:             detail::call_close(filter_, device_, BOOST_IOS::in),
Chris@16:             detail::call_close(filter_, device_, BOOST_IOS::out),
Chris@16:             detail::call_close(device_, BOOST_IOS::out)
Chris@16:         );
Chris@16:     } else if (is_convertible<device_mode, input>::value) {
Chris@16:         detail::execute_all(
Chris@16:             detail::call_close(device_, BOOST_IOS::in),
Chris@16:             detail::call_close(filter_, device_, BOOST_IOS::in)
Chris@16:         );
Chris@16:     } else {
Chris@16:         detail::execute_all(
Chris@16:             detail::call_close(filter_, device_, BOOST_IOS::out),
Chris@16:             detail::call_close(device_, BOOST_IOS::out)
Chris@16:         );
Chris@16:     }
Chris@16: }
Chris@16: 
Chris@16: template<typename Filter, typename Device, typename Mode>
Chris@16: void composite_device<Filter, Device, Mode>::close(BOOST_IOS::openmode which)
Chris@16: {
Chris@16:     BOOST_STATIC_ASSERT((is_convertible<Mode, two_sequence>::value));
Chris@16:     BOOST_STATIC_ASSERT(!(is_convertible<filter_mode, dual_use>::value));
Chris@16: 
Chris@16:     // Close input sequences in reverse order
Chris@16:     if (which == BOOST_IOS::in) {
Chris@16:         detail::execute_all(
Chris@16:             detail::call_close(device_, BOOST_IOS::in),
Chris@16:             detail::call_close(filter_, device_, BOOST_IOS::in) 
Chris@16:         );
Chris@16:     }
Chris@16: 
Chris@16:     // Close output sequences in forward order
Chris@16:     if (which == BOOST_IOS::out) {
Chris@16:         detail::execute_all(
Chris@16:             detail::call_close(filter_, device_, BOOST_IOS::out),
Chris@16:             detail::call_close(device_, BOOST_IOS::out)
Chris@16:         );
Chris@16:     }
Chris@16: }
Chris@16: 
Chris@16: template<typename Filter, typename Device, typename Mode>
Chris@16: bool composite_device<Filter, Device, Mode>::flush()
Chris@16: {
Chris@16:     bool r1 = iostreams::flush(filter_, device_);
Chris@16:     bool r2 = iostreams::flush(device_);
Chris@16:     return r1 && r2;
Chris@16: }
Chris@16: 
Chris@16: template<typename Filter, typename Device, typename Mode>
Chris@16: std::streamsize
Chris@16: composite_device<Filter, Device, Mode>::optimal_buffer_size() const
Chris@16: { return iostreams::optimal_buffer_size(device_); }
Chris@16: 
Chris@16: } // End namespace detail.
Chris@16: 
Chris@16: } } // End namespaces iostreams, boost.
Chris@16: 
Chris@16: #include <boost/iostreams/detail/config/enable_warnings.hpp>
Chris@16: 
Chris@16: #endif // #ifndef BOOST_IOSTREAMS_COMPOSE_HPP_INCLUDED