/*
Copyright  1999 CERN - European Organization for Nuclear Research.
Permission to use, copy, modify, distribute and sell this software and its documentation for any purpose 
is hereby granted without fee, provided that the above copyright notice appear in all copies and 
that both that copyright notice and this permission notice appear in supporting documentation. 
CERN makes no representations about the suitability of this software for any purpose. 
It is provided "as is" without expressed or implied warranty.
*/
package cern.colt.matrix;

/**
 * Interface that represents a condition or procedure object: takes 
 * a single argument and returns a boolean value.
 */
public interface DoubleMatrix1DProcedure {
/**
 * Applies a procedure to an argument.
 * Optionally can return a boolean flag to inform the object calling the procedure.
 *
 * <p>Example: forEach() methods often use procedure objects.
 * To signal to a forEach() method whether iteration should continue normally or terminate (because for example a matching element has been found),
 * a procedure can return <tt>false</tt> to indicate termination and <tt>true</tt> to indicate continuation.
 *
 * @param element   element passed to the procedure.
 * @return a flag  to inform the object calling the procedure.
 */
abstract public boolean apply(DoubleMatrix1D element);
}