boost/iostreams/categories.hpp
// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com) // (C) Copyright 2003-2007 Jonathan Turkanis // Distributed under the Boost Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.) // See http://www.boost.org/libs/iostreams for documentation. // Contains category and mode tags for classifying filters, devices and // standard stream and stream buffers types. #ifndef BOOST_IOSTREAMS_CATEGORIES_HPP_INCLUDED #define BOOST_IOSTREAMS_CATEGORIES_HPP_INCLUDED #if defined(_MSC_VER) && (_MSC_VER >= 1020) # pragma once #endif namespace boost { namespace iostreams { //------------------Tags for dispatch according to i/o mode-------------------// struct any_tag { }; namespace detail { struct two_sequence : virtual any_tag { }; } namespace detail { struct random_access : virtual any_tag { }; } namespace detail { struct one_head : virtual any_tag { }; } namespace detail { struct two_head : virtual any_tag { }; } struct input : virtual any_tag { }; struct output : virtual any_tag { }; struct bidirectional : virtual input, virtual output, detail::two_sequence { }; struct dual_use : virtual input, virtual output { }; // Pseudo-mode. struct input_seekable : virtual input, virtual detail::random_access { }; struct output_seekable : virtual output, virtual detail::random_access { }; struct seekable : virtual input_seekable, virtual output_seekable, detail::one_head { }; struct dual_seekable : virtual input_seekable, virtual output_seekable, detail::two_head { }; struct bidirectional_seekable : input_seekable, output_seekable, bidirectional, detail::two_head { }; //------------------Tags for use as i/o categories----------------------------// struct device_tag : virtual any_tag { }; struct filter_tag : virtual any_tag { }; // // Tags for optional behavior. // struct peekable_tag : virtual any_tag { }; // Devices. struct closable_tag : virtual any_tag { }; struct flushable_tag : virtual any_tag { }; struct localizable_tag : virtual any_tag { }; struct optimally_buffered_tag : virtual any_tag { }; struct direct_tag : virtual any_tag { }; // Devices. struct multichar_tag : virtual any_tag { }; // Filters. struct source_tag : device_tag, input { }; struct sink_tag : device_tag, output { }; struct bidirectional_device_tag : device_tag, bidirectional { }; struct seekable_device_tag : virtual device_tag, seekable { }; struct input_filter_tag : filter_tag, input { }; struct output_filter_tag : filter_tag, output { }; struct bidirectional_filter_tag : filter_tag, bidirectional { }; struct seekable_filter_tag : filter_tag, seekable { }; struct dual_use_filter_tag : filter_tag, dual_use { }; struct multichar_input_filter_tag : multichar_tag, input_filter_tag { }; struct multichar_output_filter_tag : multichar_tag, output_filter_tag { }; struct multichar_bidirectional_filter_tag : multichar_tag, bidirectional_filter_tag { }; struct multichar_seekable_filter_tag : multichar_tag, seekable_filter_tag { }; struct multichar_dual_use_filter_tag : filter_tag, dual_use { }; // // Tags for standard streams and streambufs. // struct std_io_tag : virtual localizable_tag { }; struct istream_tag : virtual device_tag, virtual peekable_tag, virtual std_io_tag { }; struct ostream_tag : virtual device_tag, virtual std_io_tag { }; struct iostream_tag : istream_tag, ostream_tag { }; struct streambuf_tag : device_tag, peekable_tag, std_io_tag { }; struct ifstream_tag : input_seekable, closable_tag, istream_tag { }; struct ofstream_tag : output_seekable, closable_tag, ostream_tag { }; struct fstream_tag : seekable, closable_tag, iostream_tag { }; struct filebuf_tag : seekable, closable_tag, streambuf_tag { }; struct istringstream_tag : input_seekable, istream_tag { }; struct ostringstream_tag : output_seekable, ostream_tag { }; struct stringstream_tag : dual_seekable, iostream_tag { }; struct stringbuf_tag : dual_seekable, streambuf_tag { }; struct generic_istream_tag : input_seekable, istream_tag { }; struct generic_ostream_tag : output_seekable, ostream_tag { }; struct generic_iostream_tag : seekable, iostream_tag { }; struct generic_streambuf_tag : seekable, streambuf_tag { }; } } // End namespaces iostreams, boost. #endif // #ifndef BOOST_IOSTREAMS_CATEGORIES_HPP_INCLUDED