Chris@16: // (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
Chris@16: // (C) Copyright 2003-2007 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: #ifndef BOOST_IOSTREAMS_DETAIL_LINKED_STREAMBUF_HPP_INCLUDED
Chris@16: #define BOOST_IOSTREAMS_DETAIL_LINKED_STREAMBUF_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 <typeinfo>
Chris@16: #include <boost/config.hpp>                        // member template friends.
Chris@16: #include <boost/iostreams/detail/char_traits.hpp>
Chris@16: #include <boost/iostreams/detail/ios.hpp>          // openmode.
Chris@16: #include <boost/iostreams/detail/streambuf.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 { namespace detail {
Chris@16: 
Chris@16: template<typename Self, typename Ch, typename Tr, typename Alloc, typename Mode>
Chris@16: class chain_base;
Chris@16: 
Chris@16: template<typename Chain, typename Access, typename Mode> class chainbuf;
Chris@16: 
Chris@16: #define BOOST_IOSTREAMS_USING_PROTECTED_STREAMBUF_MEMBERS(base) \
Chris@16:     using base::eback; using base::gptr; using base::egptr; \
Chris@16:     using base::setg; using base::gbump; using base::pbase; \
Chris@16:     using base::pptr; using base::epptr; using base::setp; \
Chris@16:     using base::pbump; using base::underflow; using base::pbackfail; \
Chris@16:     using base::xsgetn; using base::overflow; using base::xsputn; \
Chris@16:     using base::sync; using base::seekoff; using base::seekpos; \
Chris@16:     /**/
Chris@16: 
Chris@16: template<typename Ch, typename Tr = BOOST_IOSTREAMS_CHAR_TRAITS(Ch) >
Chris@16: class linked_streambuf : public BOOST_IOSTREAMS_BASIC_STREAMBUF(Ch, Tr) {
Chris@16: protected:
Chris@16:     linked_streambuf() : flags_(0) { }
Chris@16:     void set_true_eof(bool eof) 
Chris@16:     { 
Chris@16:         flags_ = (flags_ & ~f_true_eof) | (eof ? f_true_eof : 0); 
Chris@16:     }
Chris@16: public:
Chris@16: 
Chris@16:     // Should be called only after receiving an ordinary EOF indication,
Chris@16:     // to confirm that it represents EOF rather than WOULD_BLOCK.
Chris@16:     bool true_eof() const { return (flags_ & f_true_eof) != 0; }
Chris@16: protected:
Chris@16: 
Chris@16:     //----------grant friendship to chain_base and chainbuf-------------------//
Chris@16: 
Chris@16: #ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
Chris@16:     template< typename Self, typename ChT, typename TrT,
Chris@16:               typename Alloc, typename Mode >
Chris@16:     friend class chain_base;
Chris@16:     template<typename Chain, typename Mode, typename Access>
Chris@16:     friend class chainbuf;
Chris@16:     template<typename U>
Chris@16:     friend class member_close_operation; 
Chris@16: #else
Chris@16:     public:
Chris@16:         typedef BOOST_IOSTREAMS_BASIC_STREAMBUF(Ch, Tr) base;
Chris@16:         BOOST_IOSTREAMS_USING_PROTECTED_STREAMBUF_MEMBERS(base)
Chris@16: #endif
Chris@16:     void close(BOOST_IOS::openmode which)
Chris@16:     {
Chris@16:         if ( which == BOOST_IOS::in && 
Chris@16:             (flags_ & f_input_closed) == 0 )
Chris@16:         {
Chris@16:             flags_ |= f_input_closed;
Chris@16:             close_impl(which);
Chris@16:         }
Chris@16:         if ( which == BOOST_IOS::out && 
Chris@16:             (flags_ & f_output_closed) == 0 )
Chris@16:         {
Chris@16:             flags_ |= f_output_closed;
Chris@16:             close_impl(which);
Chris@16:         }
Chris@16:     }
Chris@16:     void set_needs_close()
Chris@16:     {
Chris@16:         flags_ &= ~(f_input_closed | f_output_closed);
Chris@16:     }
Chris@16:     virtual void set_next(linked_streambuf<Ch, Tr>* /* next */) { }
Chris@16:     virtual void close_impl(BOOST_IOS::openmode) = 0;
Chris@16:     virtual bool auto_close() const = 0;
Chris@16:     virtual void set_auto_close(bool) = 0;
Chris@16:     virtual bool strict_sync() = 0;
Chris@16:     virtual const std::type_info& component_type() const = 0;
Chris@16:     virtual void* component_impl() = 0;
Chris@16: #ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
Chris@16:     private:
Chris@16: #else
Chris@16:     public:
Chris@16: #endif
Chris@16: private:
Chris@16:     enum flag_type {
Chris@16:         f_true_eof       = 1,
Chris@16:         f_input_closed   = f_true_eof << 1,
Chris@16:         f_output_closed  = f_input_closed << 1
Chris@16:     };
Chris@16:     int flags_;
Chris@16: };
Chris@16: 
Chris@16: } } } // End namespaces detail, iostreams, boost.
Chris@16: 
Chris@16: #include <boost/iostreams/detail/config/enable_warnings.hpp> // MSVC.
Chris@16: 
Chris@16: #endif // #ifndef BOOST_IOSTREAMS_DETAIL_LINKED_STREAMBUF_HPP_INCLUDED