src/extra166y/ParallelLongArrayWithMapping.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/publicdomain/zero/1.0/
 */

package extra166y;

import jsr166y.*;
import static extra166y.Ops.*;
import java.util.*;
import java.util.concurrent.atomic.*;

/**
 * A prefix view of ParallelLongArray 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 ParallelLongArray or its other prefix classes.
 */
public abstract class ParallelLongArrayWithMapping<U> extends AbstractParallelAnyArray.LPap {
    ParallelLongArrayWithMapping
        (ForkJoinPool ex, int origin, int fence, long[] 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 mapped elements.
     * @return a new ParallelArray holding mapped elements
     */
    public ParallelArray<U> all() {
        return new ParallelArray<U>(ex, (U[])allObjects(null));
    }

    /**
     * Returns a new ParallelArray with the given element type holding
     * all elements.
     * @param elementType the type of the elements
     * @return a new ParallelArray holding all 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> ParallelLongArrayWithMapping<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 ParallelLongArrayWithLongMapping withMapping
        (ObjectToLong<? 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 ParallelLongArrayWithDoubleMapping withMapping
        (ObjectToDouble<? 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> ParallelLongArrayWithMapping<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> ParallelLongArrayWithMapping<V> withMapping
        (ObjectAndDoubleToObject<? super U, ? extends V> combiner,
         ParallelDoubleArrayWithDoubleMapping other) {
        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> ParallelLongArrayWithMapping<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> ParallelLongArrayWithDoubleMapping 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 ParallelLongArrayWithDoubleMapping 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
     * @throws IllegalArgumentException if other array is a
     * filtered view (all filters must precede all mappings)
     */
    public ParallelLongArrayWithDoubleMapping 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> ParallelLongArrayWithLongMapping 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 ParallelLongArrayWithLongMapping 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 ParallelLongArrayWithLongMapping 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> ParallelLongArrayWithMapping<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 ParallelLongArrayWithDoubleMapping 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 ParallelLongArrayWithLongMapping 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:	1.7
Committed:	Thu Feb 26 06:53:34 2015 UTC (9 years, 1 month ago) by jsr166
Branch:	MAIN
CVS Tags:	HEAD
Changes since 1.6:	+0 -1 lines
Log Message:	delete unused imports
#	Content
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/publicdomain/zero/1.0/
5	*/
6
7	package extra166y;
8
9	import jsr166y.*;
10	import static extra166y.Ops.*;
11	import java.util.*;
12	import java.util.concurrent.atomic.*;
13
14	/**
15	* A prefix view of ParallelLongArray 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 ParallelLongArray or its other prefix classes.
19	*/
20	public abstract class ParallelLongArrayWithMapping<U> extends AbstractParallelAnyArray.LPap {
21	ParallelLongArrayWithMapping
22	(ForkJoinPool ex, int origin, int fence, long[] 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	return (i < 0) ? null : (U)oget(i);
55	}
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 mapped elements.
121	* @return a new ParallelArray holding mapped 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	* all elements.
130	* @param elementType the type of the elements
131	* @return a new ParallelArray holding all 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> ParallelLongArrayWithMapping<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 ParallelLongArrayWithLongMapping withMapping
155	(ObjectToLong<? 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 ParallelLongArrayWithDoubleMapping withMapping
165	(ObjectToDouble<? 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> ParallelLongArrayWithMapping<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> ParallelLongArrayWithMapping<V> withMapping
194	(ObjectAndDoubleToObject<? super U, ? extends V> combiner,
195	ParallelDoubleArrayWithDoubleMapping other) {
196	return withIndexedMapping
197	(AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
198	}
199
200	/**
201	* Returns an operation prefix that causes a method to operate
202	* on binary mappings of this array and the other array.
203	* @param combiner the combiner
204	* @param other the other array
205	* @return operation prefix
206	* @throws IllegalArgumentException if other array is a
207	* filtered view (all filters must precede all mappings)
208	*/
209	public <V> ParallelLongArrayWithMapping<V> withMapping
210	(ObjectAndLongToObject<? super U, ? extends V> combiner,
211	ParallelLongArrayWithLongMapping other) {
212	if (other.hasFilter()) throw new IllegalArgumentException();
213	return withIndexedMapping
214	(AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
215	}
216
217	/**
218	* Returns an operation prefix that causes a method to operate
219	* on binary mappings of this array and the other array.
220	* @param combiner the combiner
221	* @param other the other array
222	* @return operation prefix
223	* @throws IllegalArgumentException if other array is a
224	* filtered view (all filters must precede all mappings)
225	*/
226	public <V,W> ParallelLongArrayWithDoubleMapping withMapping
227	(ObjectAndObjectToDouble<? super U, ? super V> combiner,
228	ParallelArrayWithMapping<W,V> other) {
229	if (other.hasFilter()) throw new IllegalArgumentException();
230	return withIndexedMapping
231	(AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
232	}
233
234	/**
235	* Returns an operation prefix that causes a method to operate
236	* on binary mappings of this array and the other array.
237	* @param combiner the combiner
238	* @param other the other array
239	* @return operation prefix
240	* @throws IllegalArgumentException if other array is a
241	* filtered view (all filters must precede all mappings)
242	*/
243	public ParallelLongArrayWithDoubleMapping withMapping
244	(ObjectAndDoubleToDouble<? super U> combiner,
245	ParallelDoubleArrayWithDoubleMapping other) {
246	if (other.hasFilter()) throw new IllegalArgumentException();
247	return withIndexedMapping
248	(AbstractParallelAnyArray.indexedMapper(combiner, other, origin));
249	}
250
251	/**
252	* Returns an operation prefix that causes a method to operate
253	* on binary mappings of this array and the other array.
254	* @param combiner the combiner
255	* @param other the other array
256	* @return operation prefix
257	* @throws IllegalArgumentException if other array is a
258	* filtered view (all filters must precede all mappings)
259	*/
260	public ParallelLongArrayWithDoubleMapping 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> ParallelLongArrayWithLongMapping 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 ParallelLongArrayWithLongMapping 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 ParallelLongArrayWithLongMapping 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> ParallelLongArrayWithMapping<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 ParallelLongArrayWithDoubleMapping 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 ParallelLongArrayWithLongMapping 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	}