src/extra166y/ParallelDoubleArrayWithMapping.java

/*
 * Written by Doug Lea with assistance from members of JCP JSR-166
 * Expert Group and released to the public domain, as explained at
 * http://creativecommons.org/licenses/publicdomain
 */

package extra166y;
import jsr166y.*;
import static extra166y.Ops.*;
import java.util.*;
import java.util.concurrent.atomic.*;
import java.lang.reflect.Array;

/**
 * A prefix view of ParallelDoubleArray that causes operations to apply
 * to mappings of elements, not to the elements themselves.
 * Instances of this class may be constructed only via prefix
 * methods of ParallelDoubleArray or its other prefix classes.
 */
public abstract class ParallelDoubleArrayWithMapping<U> extends AbstractParallelAnyArray.DPap {
    ParallelDoubleArrayWithMapping
        (ForkJoinPool ex, int origin, int fence, double[] array) {
        super(ex, origin, fence, array);
    }

    /**
     * Applies the given procedure to mapped elements
     * @param procedure the procedure
     */
    public void apply(Procedure<? super U> procedure) {
        ex.invoke(new PAS.FJOApply(this, origin, fence, null, procedure));
    }

    /**
     * Returns reduction of mapped elements
     * @param reducer the reducer
     * @param base the result for an empty array
     * @return reduction
     */
    public U reduce(Reducer<U> reducer, U base) {
        PAS.FJOReduce f = new PAS.FJOReduce
            (this, origin, fence, null, reducer, base);
        ex.invoke(f);
        return (U)(f.result);
    }

    /**
     * Returns mapping of some element matching bound and filter
     * constraints, or null if none.
     * @return mapping of matching element, or null if none.
     */
    public U any() {
        int i = anyIndex();
        return (i < 0) ? null : (U)oget(i);
    }

    /**
     * Returns the minimum mapped element, or null if empty
     * @param comparator the comparator
     * @return minimum mapped element, or null if empty
     */
    public U min(Comparator<? super U> comparator) {
        return reduce(CommonOps.<U>minReducer(comparator), null);
    }

    /**
     * Returns the minimum mapped element, or null if empty,
     * assuming that all elements are Comparables
     * @return minimum mapped element, or null if empty
     * @throws ClassCastException if any element is not Comparable.
     */
    public U min() {
        return reduce((Reducer<U>)(CommonOps.castedMinReducer()), null);
    }

    /**
     * Returns the maximum mapped element, or null if empty
     * @param comparator the comparator
     * @return maximum mapped element, or null if empty
     */
    public U max(Comparator<? super U> comparator) {
        return reduce(CommonOps.<U>maxReducer(comparator), null);
    }

    /**
     * Returns the maximum mapped element, or null if empty
     * assuming that all elements are Comparables
     * @return maximum mapped element, or null if empty
     * @throws ClassCastException if any element is not Comparable.
     */
    public U max() {
        return reduce((Reducer<U>)(CommonOps.castedMaxReducer()), null);
    }

    /**
     * Returns summary statistics, using the given comparator
     * to locate minimum and maximum elements.
     * @param comparator the comparator to use for
     * locating minimum and maximum elements
     * @return the summary.
     */
    public ParallelArray.SummaryStatistics<U> summary
        (Comparator<? super U> comparator) {
        PAS.FJOStats f = new PAS.FJOStats
            (this, origin, fence, null, comparator);
        ex.invoke(f);
        return (ParallelArray.SummaryStatistics<U>)f;
    }

    /**
     * Returns summary statistics, assuming that all elements are
     * Comparables
     * @return the summary.
     */
    public ParallelArray.SummaryStatistics<U> summary() {
        return summary((Comparator<? super U>)(CommonOps.castedComparator()));
    }

    /**
     * Returns a new ParallelArray holding elements
     * @return a new ParallelArray holding elements
     */
    public ParallelArray<U> all() {
        return new ParallelArray<U>(ex, (U[])allObjects(null));
    }

    /**
     * Returns a new ParallelArray with the given element type holding
     * elements
     * @param elementType the type of the elements
     * @return a new ParallelArray holding elements
     */
    public ParallelArray<U> all(Class<? super U> elementType) {
        return new ParallelArray<U>(ex, (U[])allObjects(elementType));
    }

    /**
     * Returns an operation prefix that causes a method to operate
     * on mapped elements of the array using the given op
     * applied to current op's results
     * @param op the op
     * @return operation prefix
     */
    public abstract <V> ParallelDoubleArrayWithMapping<V> withMapping
        (Op<? super U, ? extends V> op);

    /**
     * Returns an operation prefix that causes a method to operate
     * on mapped elements of the array using the given op
     * applied to current op's results
     * @param op the op
     * @return operation prefix
     */
    public abstract ParallelDoubleArrayWithDoubleMapping withMapping
        (ObjectToDouble<? super U> op);

    /**
     * Returns an operation prefix that causes a method to operate
     * on mapped elements of the array using the given op
     * applied to current op's results
     * @param op the op
     * @return operation prefix
     */
    public abstract ParallelDoubleArrayWithLongMapping withMapping
        (ObjectToLong<? super U> op);

    /**
     * Returns an operation prefix that causes a method to operate
     * on binary mappings of this array and the other array.
     * @param combiner the combiner
     * @param other the other array
     * @return operation prefix
     * @throws IllegalArgumentException if other array is a
     * filtered view (all filters must precede all mappings).
     */
    public <V,W,X> ParallelDoubleArrayWithMapping<W> withMapping
        (BinaryOp<? super U, ? super V, ? extends W> combiner,
         ParallelArrayWithMapping<X,V> other) {
        if (other.hasFilter()) throw new IllegalArgumentException();
        return withIndexedMapping
            (AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
    }

    /**
     * Returns an operation prefix that causes a method to operate
     * on binary mappings of this array and the other array.
     * @param combiner the combiner
     * @param other the other array
     * @return operation prefix
     * @throws IllegalArgumentException if other array is a
     * filtered view (all filters must precede all mappings).
     */
    public <V> ParallelDoubleArrayWithMapping<V> withMapping
        (ObjectAndDoubleToObject<? super U, ? extends V> combiner,
         ParallelDoubleArrayWithDoubleMapping other) {
        if (other.hasFilter()) throw new IllegalArgumentException();
        return withIndexedMapping
            (AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
    }

    /**
     * Returns an operation prefix that causes a method to operate
     * on binary mappings of this array and the other array.
     * @param combiner the combiner
     * @param other the other array
     * @return operation prefix
     * @throws IllegalArgumentException if other array is a
     * filtered view (all filters must precede all mappings).
     */
    public <V> ParallelDoubleArrayWithMapping<V> withMapping
        (ObjectAndLongToObject<? super U, ? extends V> combiner,
         ParallelLongArrayWithLongMapping other) {
        if (other.hasFilter()) throw new IllegalArgumentException();
        return withIndexedMapping
            (AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
    }


    /**
     * Returns an operation prefix that causes a method to operate
     * on binary mappings of this array and the other array.
     * @param combiner the combiner
     * @param other the other array
     * @return operation prefix
     * @throws IllegalArgumentException if other array is a
     * filtered view (all filters must precede all mappings).
     */
    public <V,W> ParallelDoubleArrayWithDoubleMapping withMapping
        (ObjectAndObjectToDouble<? super U, ? super V> combiner,
         ParallelArrayWithMapping<W,V> other) {
        if (other.hasFilter()) throw new IllegalArgumentException();
        return withIndexedMapping
            (AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
    }

    /**
     * Returns an operation prefix that causes a method to operate
     * on binary mappings of this array and the other array.
     * @param combiner the combiner
     * @param other the other array
     * @return operation prefix
     * @throws IllegalArgumentException if other array is a
     * filtered view (all filters must precede all mappings).
     */
    public ParallelDoubleArrayWithDoubleMapping withMapping
        (ObjectAndDoubleToDouble<? super U> combiner,
         ParallelDoubleArrayWithDoubleMapping other) {
        if (other.hasFilter()) throw new IllegalArgumentException();
        return withIndexedMapping
            (AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
    }

    /**
     * Returns an operation prefix that causes a method to operate
     * on binary mappings of this array and the other array.
     * @param combiner the combiner
     * @param other the other array
     * @return operation prefix
     */
    public ParallelDoubleArrayWithDoubleMapping withMapping
        (ObjectAndLongToDouble<? super U> combiner,
         ParallelLongArrayWithLongMapping other) {
        if (other.hasFilter()) throw new IllegalArgumentException();
        return withIndexedMapping
            (AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
    }

    /**
     * Returns an operation prefix that causes a method to operate
     * on binary mappings of this array and the other array.
     * @param combiner the combiner
     * @param other the other array
     * @return operation prefix
     * @throws IllegalArgumentException if other array is a
     * filtered view (all filters must precede all mappings).
     */
    public <V,W> ParallelDoubleArrayWithLongMapping withMapping
        (ObjectAndObjectToLong<? super U, ? super V> combiner,
         ParallelArrayWithMapping<W,V> other) {
        if (other.hasFilter()) throw new IllegalArgumentException();
        return withIndexedMapping
            (AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
    }

    /**
     * Returns an operation prefix that causes a method to operate
     * on binary mappings of this array and the other array.
     * @param combiner the combiner
     * @param other the other array
     * @return operation prefix
     * @throws IllegalArgumentException if other array is a
     * filtered view (all filters must precede all mappings).
     */
    public ParallelDoubleArrayWithLongMapping withMapping
        (ObjectAndDoubleToLong<? super U> combiner,
         ParallelDoubleArrayWithDoubleMapping other) {
        if (other.hasFilter()) throw new IllegalArgumentException();
        return withIndexedMapping
            (AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
    }

    /**
     * Returns an operation prefix that causes a method to operate
     * on binary mappings of this array and the other array.
     * @param combiner the combiner
     * @param other the other array
     * @return operation prefix
     * @throws IllegalArgumentException if other array is a
     * filtered view (all filters must precede all mappings).
     */
    public ParallelDoubleArrayWithLongMapping withMapping
        (ObjectAndLongToLong<? super U> combiner,
         ParallelLongArrayWithLongMapping other) {
        if (other.hasFilter()) throw new IllegalArgumentException();
        return withIndexedMapping
            (AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
    }

    /**
     * Returns an operation prefix that causes a method to operate
     * on mappings of this array using the given mapper that
     * accepts as arguments an element's current index and value
     * (as mapped by preceding mappings, if any), and produces a
     * new value.
     * @param mapper the mapper
     * @return operation prefix
     */
    public abstract <V> ParallelDoubleArrayWithMapping<V> withIndexedMapping
        (IntAndObjectToObject<? super U, ? extends V> mapper);

    /**
     * Returns an operation prefix that causes a method to operate
     * on mappings of this array using the given mapper that
     * accepts as arguments an element's current index and value
     * (as mapped by preceding mappings, if any), and produces a
     * new value.
     * @param mapper the mapper
     * @return operation prefix
     */
    public abstract ParallelDoubleArrayWithDoubleMapping withIndexedMapping
        (IntAndObjectToDouble<? super U> mapper);

    /**
     * Returns an operation prefix that causes a method to operate
     * on mappings of this array using the given mapper that
     * accepts as arguments an element's current index and value
     * (as mapped by preceding mappings, if any), and produces a
     * new value.
     * @param mapper the mapper
     * @return operation prefix
     */
    public abstract ParallelDoubleArrayWithLongMapping withIndexedMapping
        (IntAndObjectToLong<? super U> mapper);

    /**
     * Returns an Iterable view to sequentially step through mapped
     * elements also obeying bound and filter constraints, without
     * performing computations to evaluate them in parallel
     * @return the Iterable view
     */
    public Iterable<U> sequentially() {
        return new Sequentially<U>();
    }

}

Revision:	1.2
Committed:	Fri Oct 22 05:18:30 2010 UTC (13 years, 6 months ago) by jsr166
Branch:	MAIN
Changes since 1.1:	+1 -1 lines
Log Message:	whitespace
#	User	Rev	Content
1	dl	1.1	/*
2			* Written by Doug Lea with assistance from members of JCP JSR-166
3			* Expert Group and released to the public domain, as explained at
4			* http://creativecommons.org/licenses/publicdomain
5			*/
6
7			package extra166y;
8			import jsr166y.*;
9			import static extra166y.Ops.*;
10			import java.util.*;
11			import java.util.concurrent.atomic.*;
12			import java.lang.reflect.Array;
13
14			/**
15			* A prefix view of ParallelDoubleArray that causes operations to apply
16			* to mappings of elements, not to the elements themselves.
17			* Instances of this class may be constructed only via prefix
18			* methods of ParallelDoubleArray or its other prefix classes.
19			*/
20			public abstract class ParallelDoubleArrayWithMapping<U> extends AbstractParallelAnyArray.DPap {
21			ParallelDoubleArrayWithMapping
22			(ForkJoinPool ex, int origin, int fence, double[] array) {
23			super(ex, origin, fence, array);
24			}
25
26			/**
27			* Applies the given procedure to mapped elements
28			* @param procedure the procedure
29			*/
30			public void apply(Procedure<? super U> procedure) {
31			ex.invoke(new PAS.FJOApply(this, origin, fence, null, procedure));
32			}
33
34			/**
35			* Returns reduction of mapped elements
36			* @param reducer the reducer
37			* @param base the result for an empty array
38			* @return reduction
39			*/
40			public U reduce(Reducer<U> reducer, U base) {
41			PAS.FJOReduce f = new PAS.FJOReduce
42			(this, origin, fence, null, reducer, base);
43			ex.invoke(f);
44			return (U)(f.result);
45			}
46
47			/**
48			* Returns mapping of some element matching bound and filter
49			* constraints, or null if none.
50			* @return mapping of matching element, or null if none.
51			*/
52			public U any() {
53			int i = anyIndex();
54	jsr166	1.2	return (i < 0) ? null : (U)oget(i);
55	dl	1.1	}
56
57			/**
58			* Returns the minimum mapped element, or null if empty
59			* @param comparator the comparator
60			* @return minimum mapped element, or null if empty
61			*/
62			public U min(Comparator<? super U> comparator) {
63			return reduce(CommonOps.<U>minReducer(comparator), null);
64			}
65
66			/**
67			* Returns the minimum mapped element, or null if empty,
68			* assuming that all elements are Comparables
69			* @return minimum mapped element, or null if empty
70			* @throws ClassCastException if any element is not Comparable.
71			*/
72			public U min() {
73			return reduce((Reducer<U>)(CommonOps.castedMinReducer()), null);
74			}
75
76			/**
77			* Returns the maximum mapped element, or null if empty
78			* @param comparator the comparator
79			* @return maximum mapped element, or null if empty
80			*/
81			public U max(Comparator<? super U> comparator) {
82			return reduce(CommonOps.<U>maxReducer(comparator), null);
83			}
84
85			/**
86			* Returns the maximum mapped element, or null if empty
87			* assuming that all elements are Comparables
88			* @return maximum mapped element, or null if empty
89			* @throws ClassCastException if any element is not Comparable.
90			*/
91			public U max() {
92			return reduce((Reducer<U>)(CommonOps.castedMaxReducer()), null);
93			}
94
95			/**
96			* Returns summary statistics, using the given comparator
97			* to locate minimum and maximum elements.
98			* @param comparator the comparator to use for
99			* locating minimum and maximum elements
100			* @return the summary.
101			*/
102			public ParallelArray.SummaryStatistics<U> summary
103			(Comparator<? super U> comparator) {
104			PAS.FJOStats f = new PAS.FJOStats
105			(this, origin, fence, null, comparator);
106			ex.invoke(f);
107			return (ParallelArray.SummaryStatistics<U>)f;
108			}
109
110			/**
111			* Returns summary statistics, assuming that all elements are
112			* Comparables
113			* @return the summary.
114			*/
115			public ParallelArray.SummaryStatistics<U> summary() {
116			return summary((Comparator<? super U>)(CommonOps.castedComparator()));
117			}
118
119			/**
120			* Returns a new ParallelArray holding elements
121			* @return a new ParallelArray holding elements
122			*/
123			public ParallelArray<U> all() {
124			return new ParallelArray<U>(ex, (U[])allObjects(null));
125			}
126
127			/**
128			* Returns a new ParallelArray with the given element type holding
129			* elements
130			* @param elementType the type of the elements
131			* @return a new ParallelArray holding elements
132			*/
133			public ParallelArray<U> all(Class<? super U> elementType) {
134			return new ParallelArray<U>(ex, (U[])allObjects(elementType));
135			}
136
137			/**
138			* Returns an operation prefix that causes a method to operate
139			* on mapped elements of the array using the given op
140			* applied to current op's results
141			* @param op the op
142			* @return operation prefix
143			*/
144			public abstract <V> ParallelDoubleArrayWithMapping<V> withMapping
145			(Op<? super U, ? extends V> op);
146
147			/**
148			* Returns an operation prefix that causes a method to operate
149			* on mapped elements of the array using the given op
150			* applied to current op's results
151			* @param op the op
152			* @return operation prefix
153			*/
154			public abstract ParallelDoubleArrayWithDoubleMapping withMapping
155			(ObjectToDouble<? super U> op);
156
157			/**
158			* Returns an operation prefix that causes a method to operate
159			* on mapped elements of the array using the given op
160			* applied to current op's results
161			* @param op the op
162			* @return operation prefix
163			*/
164			public abstract ParallelDoubleArrayWithLongMapping withMapping
165			(ObjectToLong<? super U> op);
166
167			/**
168			* Returns an operation prefix that causes a method to operate
169			* on binary mappings of this array and the other array.
170			* @param combiner the combiner
171			* @param other the other array
172			* @return operation prefix
173			* @throws IllegalArgumentException if other array is a
174			* filtered view (all filters must precede all mappings).
175			*/
176			public <V,W,X> ParallelDoubleArrayWithMapping<W> withMapping
177			(BinaryOp<? super U, ? super V, ? extends W> combiner,
178			ParallelArrayWithMapping<X,V> other) {
179			if (other.hasFilter()) throw new IllegalArgumentException();
180			return withIndexedMapping
181			(AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
182			}
183
184			/**
185			* Returns an operation prefix that causes a method to operate
186			* on binary mappings of this array and the other array.
187			* @param combiner the combiner
188			* @param other the other array
189			* @return operation prefix
190			* @throws IllegalArgumentException if other array is a
191			* filtered view (all filters must precede all mappings).
192			*/
193			public <V> ParallelDoubleArrayWithMapping<V> withMapping
194			(ObjectAndDoubleToObject<? super U, ? extends V> combiner,
195			ParallelDoubleArrayWithDoubleMapping other) {
196			if (other.hasFilter()) throw new IllegalArgumentException();
197			return withIndexedMapping
198			(AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
199			}
200
201			/**
202			* Returns an operation prefix that causes a method to operate
203			* on binary mappings of this array and the other array.
204			* @param combiner the combiner
205			* @param other the other array
206			* @return operation prefix
207			* @throws IllegalArgumentException if other array is a
208			* filtered view (all filters must precede all mappings).
209			*/
210			public <V> ParallelDoubleArrayWithMapping<V> withMapping
211			(ObjectAndLongToObject<? super U, ? extends V> combiner,
212			ParallelLongArrayWithLongMapping other) {
213			if (other.hasFilter()) throw new IllegalArgumentException();
214			return withIndexedMapping
215			(AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
216			}
217
218
219			/**
220			* Returns an operation prefix that causes a method to operate
221			* on binary mappings of this array and the other array.
222			* @param combiner the combiner
223			* @param other the other array
224			* @return operation prefix
225			* @throws IllegalArgumentException if other array is a
226			* filtered view (all filters must precede all mappings).
227			*/
228			public <V,W> ParallelDoubleArrayWithDoubleMapping withMapping
229			(ObjectAndObjectToDouble<? super U, ? super V> combiner,
230			ParallelArrayWithMapping<W,V> other) {
231			if (other.hasFilter()) throw new IllegalArgumentException();
232			return withIndexedMapping
233			(AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
234			}
235
236			/**
237			* Returns an operation prefix that causes a method to operate
238			* on binary mappings of this array and the other array.
239			* @param combiner the combiner
240			* @param other the other array
241			* @return operation prefix
242			* @throws IllegalArgumentException if other array is a
243			* filtered view (all filters must precede all mappings).
244			*/
245			public ParallelDoubleArrayWithDoubleMapping withMapping
246			(ObjectAndDoubleToDouble<? super U> combiner,
247			ParallelDoubleArrayWithDoubleMapping other) {
248			if (other.hasFilter()) throw new IllegalArgumentException();
249			return withIndexedMapping
250			(AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
251			}
252
253			/**
254			* Returns an operation prefix that causes a method to operate
255			* on binary mappings of this array and the other array.
256			* @param combiner the combiner
257			* @param other the other array
258			* @return operation prefix
259			*/
260			public ParallelDoubleArrayWithDoubleMapping withMapping
261			(ObjectAndLongToDouble<? super U> combiner,
262			ParallelLongArrayWithLongMapping other) {
263			if (other.hasFilter()) throw new IllegalArgumentException();
264			return withIndexedMapping
265			(AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
266			}
267
268			/**
269			* Returns an operation prefix that causes a method to operate
270			* on binary mappings of this array and the other array.
271			* @param combiner the combiner
272			* @param other the other array
273			* @return operation prefix
274			* @throws IllegalArgumentException if other array is a
275			* filtered view (all filters must precede all mappings).
276			*/
277			public <V,W> ParallelDoubleArrayWithLongMapping withMapping
278			(ObjectAndObjectToLong<? super U, ? super V> combiner,
279			ParallelArrayWithMapping<W,V> other) {
280			if (other.hasFilter()) throw new IllegalArgumentException();
281			return withIndexedMapping
282			(AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
283			}
284
285			/**
286			* Returns an operation prefix that causes a method to operate
287			* on binary mappings of this array and the other array.
288			* @param combiner the combiner
289			* @param other the other array
290			* @return operation prefix
291			* @throws IllegalArgumentException if other array is a
292			* filtered view (all filters must precede all mappings).
293			*/
294			public ParallelDoubleArrayWithLongMapping withMapping
295			(ObjectAndDoubleToLong<? super U> combiner,
296			ParallelDoubleArrayWithDoubleMapping other) {
297			if (other.hasFilter()) throw new IllegalArgumentException();
298			return withIndexedMapping
299			(AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
300			}
301
302			/**
303			* Returns an operation prefix that causes a method to operate
304			* on binary mappings of this array and the other array.
305			* @param combiner the combiner
306			* @param other the other array
307			* @return operation prefix
308			* @throws IllegalArgumentException if other array is a
309			* filtered view (all filters must precede all mappings).
310			*/
311			public ParallelDoubleArrayWithLongMapping withMapping
312			(ObjectAndLongToLong<? super U> combiner,
313			ParallelLongArrayWithLongMapping other) {
314			if (other.hasFilter()) throw new IllegalArgumentException();
315			return withIndexedMapping
316			(AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
317			}
318
319			/**
320			* Returns an operation prefix that causes a method to operate
321			* on mappings of this array using the given mapper that
322			* accepts as arguments an element's current index and value
323			* (as mapped by preceding mappings, if any), and produces a
324			* new value.
325			* @param mapper the mapper
326			* @return operation prefix
327			*/
328			public abstract <V> ParallelDoubleArrayWithMapping<V> withIndexedMapping
329			(IntAndObjectToObject<? super U, ? extends V> mapper);
330
331			/**
332			* Returns an operation prefix that causes a method to operate
333			* on mappings of this array using the given mapper that
334			* accepts as arguments an element's current index and value
335			* (as mapped by preceding mappings, if any), and produces a
336			* new value.
337			* @param mapper the mapper
338			* @return operation prefix
339			*/
340			public abstract ParallelDoubleArrayWithDoubleMapping withIndexedMapping
341			(IntAndObjectToDouble<? super U> mapper);
342
343			/**
344			* Returns an operation prefix that causes a method to operate
345			* on mappings of this array using the given mapper that
346			* accepts as arguments an element's current index and value
347			* (as mapped by preceding mappings, if any), and produces a
348			* new value.
349			* @param mapper the mapper
350			* @return operation prefix
351			*/
352			public abstract ParallelDoubleArrayWithLongMapping withIndexedMapping
353			(IntAndObjectToLong<? super U> mapper);
354
355			/**
356			* Returns an Iterable view to sequentially step through mapped
357			* elements also obeying bound and filter constraints, without
358			* performing computations to evaluate them in parallel
359			* @return the Iterable view
360			*/
361			public Iterable<U> sequentially() {
362			return new Sequentially<U>();
363			}
364
365			}
366