75 lines
1.7 KiB
C++
75 lines
1.7 KiB
C++
/*
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----
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This file is part of SECONDO.
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Copyright (C) 2016,
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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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//[$][\$]
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//[_][\_]
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*/
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#ifndef ALGEBRAS_RELATION_C___OPERATORFEED_H_
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#define ALGEBRAS_RELATION_C___OPERATORFEED_H_
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#include "Operator.h"
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class OperatorFeed
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{
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public:
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/*
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5.5 Operator ~feed~
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Produces a stream from a relation by scanning the relation tuple by
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tuple.
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5.5.1 Type mapping function of operator ~feed~
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A type mapping function takes a nested list as argument. Its
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contents are type descriptions of an operator's input parameters.
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A nested list describing the output type of the operator is returned.
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Result type of feed operation.
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---- ((rel x)) -> (stream x)
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----
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*/
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static ListExpr FeedTypeMap(ListExpr args);
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/*
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5.5.2 Value mapping function of operator ~feed~
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*/
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static int
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Feed(Word* args, Word& result, int message, Word& local, Supplier s);
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#ifdef USE_PROGRESS
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static CostEstimation* FeedCostEstimationFunc();
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#endif
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};
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#endif /* ALGEBRAS_RELATION_C___OPERATORFEED_H_ */
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