96 lines
2.7 KiB
C++
96 lines
2.7 KiB
C++
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/*
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Copyright (c) 2006, Arvid Norberg
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions
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are met:
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* Redistributions of source code must retain the above copyright
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notice, this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright
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notice, this list of conditions and the following disclaimer in
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the documentation and/or other materials provided with the distribution.
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* Neither the name of the author nor the names of its
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contributors may be used to endorse or promote products derived
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from this software without specific prior written permission.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef PACKET_ITERATOR_HPP
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#define PACKET_ITERATOR_HPP
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#include <boost/iterator/iterator_facade.hpp>
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#include <vector>
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#include <stdexcept>
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namespace libtorrent { namespace dht
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{
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class packet_iterator: public boost::iterator_facade<
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packet_iterator, const char, boost::forward_traversal_tag>
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{
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public:
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typedef std::vector<char>::const_iterator base_iterator;
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packet_iterator() {}
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packet_iterator(std::vector<char>::const_iterator start
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, std::vector<char>::const_iterator end
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, std::string const& error_msg = "")
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: m_base(start)
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, m_end(end)
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, m_msg(error_msg)
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{}
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base_iterator base() const
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{ return m_base; }
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base_iterator end() const
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{ return m_end; }
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int left() const { return int(m_end - m_base); }
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private:
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friend class boost::iterator_core_access;
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bool equal(packet_iterator const& other) const
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{ return m_base == other.m_base; }
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void advance(int n)
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{
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m_base += n;
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}
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void increment()
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{ ++m_base; }
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char const& dereference() const
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{
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if (m_base == m_end) throw std::runtime_error(m_msg);
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return *m_base;
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}
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base_iterator m_base;
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base_iterator m_end;
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std::string m_msg;
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};
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} } // namespace libtorrent::dht
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#endif // PACKET_ITERATOR_HPP
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