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Diffstat (limited to 'src/third_party/boost-1.69.0/boost/iostreams/seek.hpp')
-rw-r--r-- | src/third_party/boost-1.69.0/boost/iostreams/seek.hpp | 180 |
1 files changed, 180 insertions, 0 deletions
diff --git a/src/third_party/boost-1.69.0/boost/iostreams/seek.hpp b/src/third_party/boost-1.69.0/boost/iostreams/seek.hpp new file mode 100644 index 00000000000..148c90bfa8c --- /dev/null +++ b/src/third_party/boost-1.69.0/boost/iostreams/seek.hpp @@ -0,0 +1,180 @@ +// (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. + +#ifndef BOOST_IOSTREAMS_SEEK_HPP_INCLUDED +#define BOOST_IOSTREAMS_SEEK_HPP_INCLUDED + +#if defined(_MSC_VER) +# pragma once +#endif + +#include <boost/config.hpp> // DEDUCED_TYPENAME, MSVC. +#include <boost/integer_traits.hpp> +#include <boost/iostreams/categories.hpp> +#include <boost/iostreams/detail/dispatch.hpp> +#include <boost/iostreams/detail/ios.hpp> // streamsize, seekdir, openmode. +#include <boost/iostreams/detail/streambuf.hpp> +#include <boost/iostreams/detail/wrap_unwrap.hpp> +#include <boost/iostreams/operations_fwd.hpp> +#include <boost/iostreams/positioning.hpp> +#include <boost/mpl/if.hpp> + +// Must come last. +#include <boost/iostreams/detail/config/disable_warnings.hpp> + +namespace boost { namespace iostreams { + +namespace detail { + +template<typename T> +struct seek_device_impl; + +template<typename T> +struct seek_filter_impl; + +} // End namespace detail. + +template<typename T> +inline std::streampos +seek( T& t, stream_offset off, BOOST_IOS::seekdir way, + BOOST_IOS::openmode which = BOOST_IOS::in | BOOST_IOS::out ) +{ + using namespace detail; + return seek_device_impl<T>::seek(detail::unwrap(t), off, way, which); +} + +template<typename T, typename Device> +inline std::streampos +seek( T& t, Device& dev, stream_offset off, BOOST_IOS::seekdir way, + BOOST_IOS::openmode which = BOOST_IOS::in | BOOST_IOS::out ) +{ + using namespace detail; + return seek_filter_impl<T>::seek(detail::unwrap(t), dev, off, way, which); +} + +namespace detail { + +//------------------Definition of seek_device_impl----------------------------// + +template<typename T> +struct seek_device_impl + : mpl::if_< + is_custom<T>, + operations<T>, + seek_device_impl< + BOOST_DEDUCED_TYPENAME + dispatch< + T, iostream_tag, istream_tag, ostream_tag, + streambuf_tag, two_head, any_tag + >::type + > + >::type + { }; + +struct seek_impl_basic_ios { + template<typename T> + static std::streampos seek( T& t, stream_offset off, + BOOST_IOS::seekdir way, + BOOST_IOS::openmode which ) + { + if ( way == BOOST_IOS::beg && + ( off < integer_traits<std::streamoff>::const_min || + off > integer_traits<std::streamoff>::const_max ) ) + { + return t.rdbuf()->pubseekpos(offset_to_position(off)); + } else { + return t.rdbuf()->pubseekoff(off, way, which); + } + } +}; + +template<> +struct seek_device_impl<iostream_tag> : seek_impl_basic_ios { }; + +template<> +struct seek_device_impl<istream_tag> : seek_impl_basic_ios { }; + +template<> +struct seek_device_impl<ostream_tag> : seek_impl_basic_ios { }; + +template<> +struct seek_device_impl<streambuf_tag> { + template<typename T> + static std::streampos seek( T& t, stream_offset off, + BOOST_IOS::seekdir way, + BOOST_IOS::openmode which ) + { + if ( way == BOOST_IOS::beg && + ( off < integer_traits<std::streamoff>::const_min || + off > integer_traits<std::streamoff>::const_max ) ) + { + return t.BOOST_IOSTREAMS_PUBSEEKPOS(offset_to_position(off)); + } else { + return t.BOOST_IOSTREAMS_PUBSEEKOFF(off, way, which); + } + } +}; + +template<> +struct seek_device_impl<two_head> { + template<typename T> + static std::streampos seek( T& t, stream_offset off, + BOOST_IOS::seekdir way, + BOOST_IOS::openmode which ) + { return t.seek(off, way, which); } +}; + +template<> +struct seek_device_impl<any_tag> { + template<typename T> + static std::streampos seek( T& t, stream_offset off, + BOOST_IOS::seekdir way, + BOOST_IOS::openmode ) + { return t.seek(off, way); } +}; + +//------------------Definition of seek_filter_impl----------------------------// + +template<typename T> +struct seek_filter_impl + : mpl::if_< + is_custom<T>, + operations<T>, + seek_filter_impl< + BOOST_DEDUCED_TYPENAME + dispatch<T, two_head, any_tag>::type + > + >::type + { }; + +template<> +struct seek_filter_impl<two_head> { + template<typename T, typename Device> + static std::streampos seek( T& t, Device& d, + stream_offset off, + BOOST_IOS::seekdir way, + BOOST_IOS::openmode which ) + { return t.seek(d, off, way, which); } +}; + +template<> +struct seek_filter_impl<any_tag> { + template<typename T, typename Device> + static std::streampos seek( T& t, Device& d, + stream_offset off, + BOOST_IOS::seekdir way, + BOOST_IOS::openmode ) + { return t.seek(d, off, way); } +}; + +} // End namespace detail. + +} } // End namespaces iostreams, boost. + +#include <boost/iostreams/detail/config/enable_warnings.hpp> + +#endif // #ifndef BOOST_IOSTREAMS_SEEK_HPP_INCLUDED |