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115 lines
3.9 KiB
115 lines
3.9 KiB
// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
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// (C) Copyright 2003-2007 Jonathan Turkanis
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
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// See http://www.boost.org/libs/iostreams for documentation.
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#ifndef BOOST_IOSTREAMS_DETAIL_LINKED_STREAMBUF_HPP_INCLUDED
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#define BOOST_IOSTREAMS_DETAIL_LINKED_STREAMBUF_HPP_INCLUDED
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#if defined(_MSC_VER)
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# pragma once
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#endif
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#include <boost/config.hpp> // member template friends.
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#include <boost/core/typeinfo.hpp>
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#include <boost/iostreams/detail/char_traits.hpp>
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#include <boost/iostreams/detail/ios.hpp> // openmode.
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#include <boost/iostreams/detail/streambuf.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 { namespace detail {
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template<typename Self, typename Ch, typename Tr, typename Alloc, typename Mode>
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class chain_base;
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template<typename Chain, typename Access, typename Mode> class chainbuf;
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#define BOOST_IOSTREAMS_USING_PROTECTED_STREAMBUF_MEMBERS(base) \
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using base::eback; using base::gptr; using base::egptr; \
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using base::setg; using base::gbump; using base::pbase; \
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using base::pptr; using base::epptr; using base::setp; \
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using base::pbump; using base::underflow; using base::pbackfail; \
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using base::xsgetn; using base::overflow; using base::xsputn; \
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using base::sync; using base::seekoff; using base::seekpos; \
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/**/
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template<typename Ch, typename Tr = BOOST_IOSTREAMS_CHAR_TRAITS(Ch) >
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class linked_streambuf : public BOOST_IOSTREAMS_BASIC_STREAMBUF(Ch, Tr) {
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protected:
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linked_streambuf() : flags_(0) { }
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void set_true_eof(bool eof)
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{
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flags_ = (flags_ & ~f_true_eof) | (eof ? f_true_eof : 0);
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}
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public:
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// Should be called only after receiving an ordinary EOF indication,
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// to confirm that it represents EOF rather than WOULD_BLOCK.
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bool true_eof() const { return (flags_ & f_true_eof) != 0; }
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protected:
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//----------grant friendship to chain_base and chainbuf-------------------//
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#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
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template< typename Self, typename ChT, typename TrT,
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typename Alloc, typename Mode >
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friend class chain_base;
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template<typename Chain, typename Mode, typename Access>
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friend class chainbuf;
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template<typename U>
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friend class member_close_operation;
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#else
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public:
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typedef BOOST_IOSTREAMS_BASIC_STREAMBUF(Ch, Tr) base;
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BOOST_IOSTREAMS_USING_PROTECTED_STREAMBUF_MEMBERS(base)
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#endif
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void close(BOOST_IOS::openmode which)
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{
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if ( which == BOOST_IOS::in &&
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(flags_ & f_input_closed) == 0 )
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{
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flags_ |= f_input_closed;
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close_impl(which);
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}
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if ( which == BOOST_IOS::out &&
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(flags_ & f_output_closed) == 0 )
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{
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flags_ |= f_output_closed;
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close_impl(which);
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}
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}
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void set_needs_close()
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{
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flags_ &= ~(f_input_closed | f_output_closed);
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}
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virtual void set_next(linked_streambuf<Ch, Tr>* /* next */) { }
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virtual void close_impl(BOOST_IOS::openmode) = 0;
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virtual bool auto_close() const = 0;
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virtual void set_auto_close(bool) = 0;
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virtual bool strict_sync() = 0;
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virtual const boost::core::typeinfo& component_type() const = 0;
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virtual void* component_impl() = 0;
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#ifndef BOOST_NO_MEMBER_TEMPLATE_FRIENDS
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private:
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#else
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public:
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#endif
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private:
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enum flag_type {
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f_true_eof = 1,
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f_input_closed = f_true_eof << 1,
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f_output_closed = f_input_closed << 1
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};
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int flags_;
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};
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} } } // End namespaces detail, iostreams, boost.
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#include <boost/iostreams/detail/config/enable_warnings.hpp> // MSVC.
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#endif // #ifndef BOOST_IOSTREAMS_DETAIL_LINKED_STREAMBUF_HPP_INCLUDED
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