1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/os/ossrv/ossrv_pub/boost_apis/boost/iostreams/seek.hpp Fri Jun 15 03:10:57 2012 +0200
1.3 @@ -0,0 +1,179 @@
1.4 +// (C) Copyright Jonathan Turkanis 2003.
1.5 +// Distributed under the Boost Software License, Version 1.0. (See accompanying
1.6 +// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
1.7 +
1.8 +// See http://www.boost.org/libs/iostreams for documentation.
1.9 +
1.10 +#ifndef BOOST_IOSTREAMS_SEEK_HPP_INCLUDED
1.11 +#define BOOST_IOSTREAMS_SEEK_HPP_INCLUDED
1.12 +
1.13 +#if defined(_MSC_VER) && (_MSC_VER >= 1020)
1.14 +# pragma once
1.15 +#endif
1.16 +
1.17 +#include <boost/config.hpp> // DEDUCED_TYPENAME, MSVC.
1.18 +#include <boost/integer_traits.hpp>
1.19 +#include <boost/iostreams/categories.hpp>
1.20 +#include <boost/iostreams/detail/dispatch.hpp>
1.21 +#include <boost/iostreams/detail/ios.hpp> // streamsize, seekdir, openmode.
1.22 +#include <boost/iostreams/detail/streambuf.hpp>
1.23 +#include <boost/iostreams/detail/wrap_unwrap.hpp>
1.24 +#include <boost/iostreams/operations_fwd.hpp>
1.25 +#include <boost/iostreams/positioning.hpp>
1.26 +#include <boost/mpl/if.hpp>
1.27 +
1.28 +// Must come last.
1.29 +#include <boost/iostreams/detail/config/disable_warnings.hpp>
1.30 +
1.31 +namespace boost { namespace iostreams {
1.32 +
1.33 +namespace detail {
1.34 +
1.35 +template<typename T>
1.36 +struct seek_device_impl;
1.37 +
1.38 +template<typename T>
1.39 +struct seek_filter_impl;
1.40 +
1.41 +} // End namespace detail.
1.42 +
1.43 +template<typename T>
1.44 +inline std::streampos
1.45 +seek( T& t, stream_offset off, BOOST_IOS::seekdir way,
1.46 + BOOST_IOS::openmode which = BOOST_IOS::in | BOOST_IOS::out )
1.47 +{
1.48 + using namespace detail;
1.49 + return seek_device_impl<T>::seek(detail::unwrap(t), off, way, which);
1.50 +}
1.51 +
1.52 +template<typename T, typename Device>
1.53 +inline std::streampos
1.54 +seek( T& t, Device& dev, stream_offset off, BOOST_IOS::seekdir way,
1.55 + BOOST_IOS::openmode which = BOOST_IOS::in | BOOST_IOS::out )
1.56 +{
1.57 + using namespace detail;
1.58 + return seek_filter_impl<T>::seek(detail::unwrap(t), dev, off, way, which);
1.59 +}
1.60 +
1.61 +namespace detail {
1.62 +
1.63 +//------------------Definition of seek_device_impl----------------------------//
1.64 +
1.65 +template<typename T>
1.66 +struct seek_device_impl
1.67 + : mpl::if_<
1.68 + is_custom<T>,
1.69 + operations<T>,
1.70 + seek_device_impl<
1.71 + BOOST_DEDUCED_TYPENAME
1.72 + dispatch<
1.73 + T, iostream_tag, istream_tag, ostream_tag,
1.74 + streambuf_tag, two_head, any_tag
1.75 + >::type
1.76 + >
1.77 + >::type
1.78 + { };
1.79 +
1.80 +struct seek_impl_basic_ios {
1.81 + template<typename T>
1.82 + static std::streampos seek( T& t, stream_offset off,
1.83 + BOOST_IOS::seekdir way,
1.84 + BOOST_IOS::openmode which )
1.85 + {
1.86 + if ( way == BOOST_IOS::beg &&
1.87 + ( off < integer_traits<std::streamoff>::const_min ||
1.88 + off > integer_traits<std::streamoff>::const_max ) )
1.89 + {
1.90 + return t.rdbuf()->pubseekpos(offset_to_position(off));
1.91 + } else {
1.92 + return t.rdbuf()->pubseekoff(off, way, which);
1.93 + }
1.94 + }
1.95 +};
1.96 +
1.97 +template<>
1.98 +struct seek_device_impl<iostream_tag> : seek_impl_basic_ios { };
1.99 +
1.100 +template<>
1.101 +struct seek_device_impl<istream_tag> : seek_impl_basic_ios { };
1.102 +
1.103 +template<>
1.104 +struct seek_device_impl<ostream_tag> : seek_impl_basic_ios { };
1.105 +
1.106 +template<>
1.107 +struct seek_device_impl<streambuf_tag> {
1.108 + template<typename T>
1.109 + static std::streampos seek( T& t, stream_offset off,
1.110 + BOOST_IOS::seekdir way,
1.111 + BOOST_IOS::openmode which )
1.112 + {
1.113 + if ( way == BOOST_IOS::beg &&
1.114 + ( off < integer_traits<std::streamoff>::const_min ||
1.115 + off > integer_traits<std::streamoff>::const_max ) )
1.116 + {
1.117 + return t.BOOST_IOSTREAMS_PUBSEEKPOS(offset_to_position(off));
1.118 + } else {
1.119 + return t.BOOST_IOSTREAMS_PUBSEEKOFF(off, way, which);
1.120 + }
1.121 + }
1.122 +};
1.123 +
1.124 +template<>
1.125 +struct seek_device_impl<two_head> {
1.126 + template<typename T>
1.127 + static std::streampos seek( T& t, stream_offset off,
1.128 + BOOST_IOS::seekdir way,
1.129 + BOOST_IOS::openmode which )
1.130 + { return t.seek(off, way, which); }
1.131 +};
1.132 +
1.133 +template<>
1.134 +struct seek_device_impl<any_tag> {
1.135 + template<typename T>
1.136 + static std::streampos seek( T& t, stream_offset off,
1.137 + BOOST_IOS::seekdir way,
1.138 + BOOST_IOS::openmode )
1.139 + { return t.seek(off, way); }
1.140 +};
1.141 +
1.142 +//------------------Definition of seek_filter_impl----------------------------//
1.143 +
1.144 +template<typename T>
1.145 +struct seek_filter_impl
1.146 + : mpl::if_<
1.147 + is_custom<T>,
1.148 + operations<T>,
1.149 + seek_filter_impl<
1.150 + BOOST_DEDUCED_TYPENAME
1.151 + dispatch<T, two_head, any_tag>::type
1.152 + >
1.153 + >::type
1.154 + { };
1.155 +
1.156 +template<>
1.157 +struct seek_filter_impl<two_head> {
1.158 + template<typename T, typename Device>
1.159 + static std::streampos seek( T& t, Device& d,
1.160 + stream_offset off,
1.161 + BOOST_IOS::seekdir way,
1.162 + BOOST_IOS::openmode which )
1.163 + { return t.seek(d, off, way, which); }
1.164 +};
1.165 +
1.166 +template<>
1.167 +struct seek_filter_impl<any_tag> {
1.168 + template<typename T, typename Device>
1.169 + static std::streampos seek( T& t, Device& d,
1.170 + stream_offset off,
1.171 + BOOST_IOS::seekdir way,
1.172 + BOOST_IOS::openmode )
1.173 + { return t.seek(d, off, way); }
1.174 +};
1.175 +
1.176 +} // End namespace detail.
1.177 +
1.178 +} } // End namespaces iostreams, boost.
1.179 +
1.180 +#include <boost/iostreams/detail/config/enable_warnings.hpp>
1.181 +
1.182 +#endif // #ifndef BOOST_IOSTREAMS_SEEK_HPP_INCLUDED