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: // Contains category and mode tags for classifying filters, devices and 
Chris@16: // standard stream and stream buffers types.
Chris@16: 
Chris@16: #ifndef BOOST_IOSTREAMS_CATEGORIES_HPP_INCLUDED
Chris@16: #define BOOST_IOSTREAMS_CATEGORIES_HPP_INCLUDED 
Chris@16: 
Chris@16: #if defined(_MSC_VER) && (_MSC_VER >= 1020)
Chris@16: # pragma once
Chris@16: #endif
Chris@16: 
Chris@16: namespace boost { namespace iostreams {
Chris@16: 
Chris@16: //------------------Tags for dispatch according to i/o mode-------------------//
Chris@16: 
Chris@16: struct any_tag { };
Chris@16: namespace detail { struct two_sequence : virtual any_tag { }; }
Chris@16: namespace detail { struct random_access : virtual any_tag { }; }
Chris@16: namespace detail { struct one_head : virtual any_tag { }; }
Chris@16: namespace detail { struct two_head : virtual any_tag { }; }
Chris@16: struct input : virtual any_tag { };
Chris@16: struct output : virtual any_tag { };
Chris@16: struct bidirectional : virtual input, virtual output, detail::two_sequence { };
Chris@16: struct dual_use : virtual input, virtual output { }; // Pseudo-mode.
Chris@16: struct input_seekable : virtual input, virtual detail::random_access { };
Chris@16: struct output_seekable : virtual output, virtual detail::random_access { };
Chris@16: struct seekable
Chris@16:     : virtual input_seekable, 
Chris@16:       virtual output_seekable,
Chris@16:       detail::one_head
Chris@16:     { };
Chris@16: struct dual_seekable
Chris@16:     : virtual input_seekable,
Chris@16:       virtual output_seekable,
Chris@16:       detail::two_head
Chris@16:     { };  
Chris@16: struct bidirectional_seekable
Chris@16:     : input_seekable, output_seekable,
Chris@16:       bidirectional, detail::two_head
Chris@16:     { };
Chris@16: 
Chris@16: //------------------Tags for use as i/o categories----------------------------//
Chris@16: 
Chris@16: struct device_tag : virtual any_tag { };
Chris@16: struct filter_tag : virtual any_tag { };
Chris@16: 
Chris@16:     // 
Chris@16:     // Tags for optional behavior.
Chris@16:     //
Chris@16: 
Chris@16: struct peekable_tag : virtual any_tag { };        // Devices.
Chris@16: struct closable_tag : virtual any_tag { };
Chris@16: struct flushable_tag : virtual any_tag { };
Chris@16: struct localizable_tag : virtual any_tag { };
Chris@16: struct optimally_buffered_tag : virtual any_tag { };
Chris@16: struct direct_tag : virtual any_tag { };          // Devices.
Chris@16: struct multichar_tag : virtual any_tag { };       // Filters.
Chris@16: 
Chris@16: struct source_tag : device_tag, input { };
Chris@16: struct sink_tag : device_tag, output { };
Chris@16: struct bidirectional_device_tag : device_tag, bidirectional { };
Chris@16: struct seekable_device_tag : virtual device_tag, seekable { };
Chris@16: 
Chris@16: struct input_filter_tag : filter_tag, input { };
Chris@16: struct output_filter_tag : filter_tag, output { };
Chris@16: struct bidirectional_filter_tag : filter_tag, bidirectional { };
Chris@16: struct seekable_filter_tag : filter_tag, seekable { };
Chris@16: struct dual_use_filter_tag : filter_tag, dual_use { };
Chris@16: 
Chris@16: struct multichar_input_filter_tag
Chris@16:     : multichar_tag,
Chris@16:       input_filter_tag
Chris@16:     { };
Chris@16: struct multichar_output_filter_tag
Chris@16:     : multichar_tag,
Chris@16:       output_filter_tag
Chris@16:     { };
Chris@16: struct multichar_bidirectional_filter_tag
Chris@16:     : multichar_tag,
Chris@16:       bidirectional_filter_tag
Chris@16:     { };
Chris@16: struct multichar_seekable_filter_tag
Chris@16:     : multichar_tag,
Chris@16:       seekable_filter_tag
Chris@16:     { };
Chris@16: struct multichar_dual_use_filter_tag 
Chris@16:     : multichar_tag, 
Chris@16:       dual_use_filter_tag
Chris@16:     { };
Chris@16: 
Chris@16:     //
Chris@16:     // Tags for standard streams and streambufs.
Chris@16:     //
Chris@16: 
Chris@16: struct std_io_tag : virtual localizable_tag { };
Chris@16: struct istream_tag
Chris@16:     : virtual device_tag,
Chris@16:       virtual peekable_tag,
Chris@16:       virtual std_io_tag
Chris@16:     { };
Chris@16: struct ostream_tag
Chris@16:     : virtual device_tag,
Chris@16:       virtual std_io_tag
Chris@16:     { };
Chris@16: struct iostream_tag
Chris@16:     : istream_tag,
Chris@16:       ostream_tag
Chris@16:     { };
Chris@16: struct streambuf_tag
Chris@16:     : device_tag,
Chris@16:       peekable_tag,
Chris@16:       std_io_tag
Chris@16:     { };
Chris@16: struct ifstream_tag
Chris@16:     : input_seekable,
Chris@16:       closable_tag,
Chris@16:       istream_tag
Chris@16:     { };
Chris@16: struct ofstream_tag
Chris@16:     : output_seekable,
Chris@16:       closable_tag,
Chris@16:       ostream_tag
Chris@16:     { };
Chris@16: struct fstream_tag
Chris@16:     : seekable,
Chris@16:       closable_tag,
Chris@16:       iostream_tag
Chris@16:     { };
Chris@16: struct filebuf_tag
Chris@16:     : seekable,
Chris@16:       closable_tag,
Chris@16:       streambuf_tag
Chris@16:     { };
Chris@16: struct istringstream_tag
Chris@16:     : input_seekable,
Chris@16:       istream_tag
Chris@16:     { };
Chris@16: struct ostringstream_tag
Chris@16:     : output_seekable,
Chris@16:       ostream_tag
Chris@16:     { };
Chris@16: struct stringstream_tag
Chris@16:     : dual_seekable,
Chris@16:       iostream_tag
Chris@16:     { };
Chris@16: struct stringbuf_tag
Chris@16:     : dual_seekable,
Chris@16:       streambuf_tag
Chris@16:     { };
Chris@16: struct generic_istream_tag 
Chris@16:     : input_seekable,
Chris@16:       istream_tag
Chris@16:     { };
Chris@16: struct generic_ostream_tag 
Chris@16:     : output_seekable,
Chris@16:       ostream_tag
Chris@16:     { };
Chris@16: struct generic_iostream_tag 
Chris@16:     : seekable,
Chris@16:       iostream_tag
Chris@16:     { };
Chris@16: struct generic_streambuf_tag 
Chris@16:     : seekable,
Chris@16:       streambuf_tag
Chris@16:     { };
Chris@16: 
Chris@16: } } // End namespaces iostreams, boost.
Chris@16: 
Chris@16: #endif // #ifndef BOOST_IOSTREAMS_CATEGORIES_HPP_INCLUDED