65 lines
1.8 KiB
C++
65 lines
1.8 KiB
C++
/*
|
|
----
|
|
This file is part of SECONDO.
|
|
|
|
Copyright (C) 2019,
|
|
Faculty of Mathematics and Computer Science,
|
|
Database Systems for New Applications.
|
|
|
|
SECONDO is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
SECONDO is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with SECONDO; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
----
|
|
|
|
|
|
//[<] [\ensuremath{<}]
|
|
//[>] [\ensuremath{>}]
|
|
|
|
*/
|
|
|
|
#pragma once
|
|
|
|
#include <vector>
|
|
#include "Algebras/Relation-C++/RelationAlgebra.h"
|
|
|
|
class TupleSmaller{
|
|
public:
|
|
TupleSmaller(const std::vector<std::pair<int,bool> >& _p): positions(_p){}
|
|
|
|
bool operator()(Tuple* t1, Tuple* t2) const{
|
|
for(size_t i=0;i<positions.size();i++){
|
|
int c = t1->GetAttribute(positions[i].first)->
|
|
Compare(t2->GetAttribute(positions[i].first));
|
|
if(c < 0) return positions[i].second;
|
|
if(c > 0) return !positions[i].second;
|
|
}
|
|
// tuples are equal
|
|
return false;
|
|
}
|
|
private:
|
|
std::vector<std::pair<int, bool> > positions;
|
|
};
|
|
|
|
|
|
class pc{
|
|
public:
|
|
pc(TupleSmaller _comp):comp(_comp){}
|
|
bool operator()(const std::pair<Tuple*,TupleFileIterator*>& a,
|
|
const std::pair<Tuple*, TupleFileIterator*>& b){
|
|
return comp(a.first,b.first);
|
|
}
|
|
private:
|
|
TupleSmaller comp;
|
|
};
|
|
|