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/*******************************************************************************
* Copyright (c) 2010-2017, Gabor Bergmann, IncQueryLabs Ltd.
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-v20.html.
*
* SPDX-License-Identifier: EPL-2.0
*******************************************************************************/
package tools.refinery.viatra.runtime.matchers.util;
/**
* An {@link IMemory} that always contains values with a nonnegative multiplicity.
*
* <p> In case a write operation caused underflow, an {@link IllegalStateException} is thrown.
*
* @author Gabor Bergmann
* @since 1.7
*/
public interface IMultiset<T> extends IMemory<T> {
/**
* Adds the given number of occurrences to the memory. The count value must be a positive number.
*
* @param count
* the number of occurrences
* @return true if the tuple was not present before in the memory
*/
boolean addPositive(T value, int count);
}
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