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114 lines
3.9 KiB
114 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) && (_MSC_VER >= 1020) |
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# pragma once |
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#endif |
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#include <typeinfo> |
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#include <boost/config.hpp> // member template friends. |
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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 std::type_info& 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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