76 lines
1.7 KiB
C
76 lines
1.7 KiB
C
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/*
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----
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This file is part of SECONDO.
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Copyright (C) 2019,
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Faculty of Mathematics and Computer Science,
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Database Systems for New Applications.
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SECONDO is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SECONDO 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with SECONDO; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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----
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//[<] [\ensuremath{<}]
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//[>] [\ensuremath{>}]
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*/
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#pragma once
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#include "TupleSmaller.h"
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#include "mmheap.h"
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class OutHeap{
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public:
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OutHeap(std::vector<TupleFile*> _files,
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mmheap::mmheap<Tuple*, TupleSmaller>* h,
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TupleSmaller _comp):
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files(_files), h2(0), heap(h), comp(_comp), lastFromFile(0),
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lastFromHeap(0),nextRes(0){
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init();
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}
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~OutHeap();
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inline Tuple* next(){
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Tuple* res = nextRes;
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retrieveNext();
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return res;
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}
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private:
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std::vector<TupleFile*> files;
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mmheap::mmheap< std::pair<Tuple*, TupleFileIterator*>, pc >* h2;
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mmheap::mmheap<Tuple*, TupleSmaller>* heap;
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TupleSmaller comp;
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Tuple* lastFromFile;
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Tuple* lastFromHeap;
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Tuple* nextRes;
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void init();
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void retrieveNext();
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void retrieveNextFromFile();
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void retrieveNextFromHeap();
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};
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