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skip.hpp - Hosted on DriveHQ Cloud IT Platform
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路径: \\game3dprogramming\materials\GameFactory\GameFactoryDemo\references\boost_1_35_0\boost\iostreams\skip.hpp
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// (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. // To do: handle bidirection streams and output-seekable components. #ifndef BOOST_IOSTREAMS_SKIP_HPP_INCLUDED #define BOOST_IOSTREAMS_SKIP_HPP_INCLUDED #if defined(_MSC_VER) && (_MSC_VER >= 1020) # pragma once #endif #include
#include
// failure. #include
#include
#include
#include
#include
#include
#include
namespace boost { namespace iostreams { namespace detail { template
void skip(Device& dev, stream_offset off, mpl::true_) { iostreams::seek(dev, off, BOOST_IOS::cur); } template
void skip(Device& dev, stream_offset off, mpl::false_) { // gcc 2.95 needs namespace qualification for char_traits. typedef typename char_type_of
::type char_type; typedef iostreams::char_traits
traits_type; for (stream_offset z = 0; z < off; ) { typename traits_type::int_type c; if (traits_type::is_eof(c = iostreams::get(dev))) throw BOOST_IOSTREAMS_FAILURE("bad skip offset"); if (!traits_type::would_block(c)) ++z; } } template
void skip( Filter& flt, Device& dev, stream_offset off, BOOST_IOS::openmode which, mpl::true_ ) { boost::iostreams::seek(flt, dev, off, BOOST_IOS::cur, which); } template
void skip( Filter& flt, Device& dev, stream_offset off, BOOST_IOS::openmode, mpl::false_ ) { typedef typename char_type_of
::type char_type; char_type c; for (stream_offset z = 0; z < off; ) { std::streamsize amt; if ((amt = iostreams::read(flt, dev, &c, 1)) == -1) throw BOOST_IOSTREAMS_FAILURE("bad skip offset"); if (amt == 1) ++z; } } } // End namespace detail. template
void skip(Device& dev, stream_offset off) { typedef typename mode_of
::type mode; typedef mpl::or_< is_convertible
, is_convertible
> can_seek; BOOST_STATIC_ASSERT( (can_seek::value || is_convertible
::value) ); detail::skip(dev, off, can_seek()); } template
void skip( Filter& flt, Device& dev, stream_offset off, BOOST_IOS::openmode which = BOOST_IOS::in | BOOST_IOS::out ) { typedef typename mode_of
::type filter_mode; typedef typename mode_of
::type device_mode; typedef mpl::or_< mpl::and_< is_convertible
, is_convertible
>, mpl::and_< is_convertible
, is_convertible
> > can_seek; BOOST_STATIC_ASSERT( ( can_seek::value || is_convertible
::value && is_convertible
::value ) ); detail::skip(flt, dev, off, which, can_seek()); } } } // End namespaces iostreams, boost. #endif // #ifndef BOOST_IOSTREAMS_SKIP_HPP_INCLUDED //------------------------//
skip.hpp
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