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68 lines
2.2 KiB
C++
68 lines
2.2 KiB
C++
/***********************************************************************
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Moses - statistical machine translation system
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Copyright (C) 2006-2011 University of Edinburgh
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with this library; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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***********************************************************************/
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#pragma once
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#include "ChartTrellisDetour.h"
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#include <set>
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namespace Moses
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{
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/** A bounded priority queue of ChartTrellisDetour pointers. The top item is
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* the best scoring detour. The queue assumes ownership of pushed items and
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* relinquishes ownership when they are popped. Any remaining items at the
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* time of the queue's destruction are deleted.
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*/
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class ChartTrellisDetourQueue
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{
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public:
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// Create empty queue with fixed capacity of c. Capacity 0 means unbounded.
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ChartTrellisDetourQueue(size_t c) : m_capacity(c) {}
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~ChartTrellisDetourQueue();
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bool Empty() const {
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return m_queue.empty();
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}
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// Add the detour to the queue or delete it if the queue is full and the
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// score is no better than the queue's worst score.
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void Push(const ChartTrellisDetour *detour);
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// Remove the best-scoring detour from the queue and return it. The
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// caller is responsible for deleting the object.
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const ChartTrellisDetour *Pop();
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private:
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struct DetourOrderer {
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bool operator()(const ChartTrellisDetour* a,
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const ChartTrellisDetour* b) const {
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return (a->GetTotalScore() > b->GetTotalScore());
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}
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};
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typedef std::multiset<const ChartTrellisDetour *, DetourOrderer> QueueType;
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QueueType m_queue;
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const size_t m_capacity;
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};
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} // namespace Moses
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