src.it.unimi.dsi.fastutil.doubles.AbstractDoubleBidirectionalIterator Maven / Gradle / Ivy
/* Generic definitions */
/* Assertions (useful to generate conditional code) */
/* Current type and class (and size, if applicable) */
/* Value methods */
/* Interfaces (keys) */
/* Interfaces (values) */
/* Abstract implementations (keys) */
/* Abstract implementations (values) */
/* Static containers (keys) */
/* Static containers (values) */
/* Implementations */
/* Synchronized wrappers */
/* Unmodifiable wrappers */
/* Other wrappers */
/* Methods (keys) */
/* Methods (values) */
/* Methods (keys/values) */
/* Methods that have special names depending on keys (but the special names depend on values) */
/* Equality */
/* Object/Reference-only definitions (keys) */
/* Primitive-type-only definitions (keys) */
/* Object/Reference-only definitions (values) */
/*
* Copyright (C) 2002-2013 Sebastiano Vigna
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package it.unimi.dsi.fastutil.doubles;
/** An abstract class facilitating the creation of type-specific {@linkplain it.unimi.dsi.fastutil.BidirectionalIterator bidirectional iterators}.
*
* To create a type-specific bidirectional iterator, besides what is needed
* for an iterator you need both a method returning the previous element as
* primitive type and a method returning the previous element as an
* object. However, if you inherit from this class you need just one (anyone).
*
*
This class implements also a trivial version of {@link #back(int)} that
* uses type-specific methods.
*/
public abstract class AbstractDoubleBidirectionalIterator extends AbstractDoubleIterator implements DoubleBidirectionalIterator {
protected AbstractDoubleBidirectionalIterator() {}
/** Delegates to the corresponding generic method. */
public double previousDouble() { return previous().doubleValue(); }
/** Delegates to the corresponding type-specific method. */
public Double previous() { return Double.valueOf( previousDouble() ); }
/** This method just iterates the type-specific version of {@link #previous()} for
* at most n times, stopping if {@link
* #hasPrevious()} becomes false. */
public int back( final int n ) {
int i = n;
while( i-- != 0 && hasPrevious() ) previousDouble();
return n - i - 1;
}
}