40:
556:
It is possible to introduce generators into C++ using pre-processor macros. The resulting code might have aspects that are very different from native C++, but the generator syntax can be very uncluttered. The set of pre-processor macros defined in this source allow generators defined with the syntax
3710:
import IO = XL.UI.CONSOLE iterator
IntegerIterator (var out Counter : integer; Low, High : integer) written Counter in Low..High is Counter := Low while Counter <= High loop yield Counter += 1 // Note that I needs not be declared, because declared 'var
1991:
which walks down the list and stops on the first element that doesn't satisfy the predicate. If the list has been walked before until that point, it is just a strict data structure, but if any part hadn't been walked through before, it will be generated on demand. List comprehensions can be freely
292:
In the presence of generators, loop constructs of a language – such as for and while – can be reduced into a single loop ... end loop construct; all the usual loop constructs can then be comfortably simulated by using suitable generators in the right way. For example, a ranged loop like
393:
string_chars = iter (s: string) yields (char); index: int := 1; limit: int := string$ size (s); while index <= limit do yield (string$ fetch(s, index)); index := index + 1; end; end string_chars; for c: char in string_chars(s) do ... end;
251:
action, at which time the innermost loop enclosing the generator invocation is terminated. In more complicated situations, a generator may be used manually outside of a loop to create an iterator, which can then be used in various ways.
2136:
Some sequences are implemented imperatively (with private state variables) and some are implemented as (possibly infinite) lazy lists. Also, new struct definitions can have a property that specifies how they can be used as sequences.
2273:
Note that the Racket core implements powerful continuation features, providing general (re-entrant) continuations that are composable, and also delimited continuations. Using this, the generator library is implemented in Racket.
203:. Generators, also known as semicoroutines, are a special case of (and weaker than) coroutines, in that they always yield control back to the caller (when passing a value back), rather than specifying a coroutine to jump to; see
3459:
is available since C# version 2.0): Both of these examples utilize generics, but this is not required. yield keyword also helps in implementing custom stateful iterations over a collection as discussed in this discussion.
172:, can be called, and generates a sequence of values. However, instead of building an array containing all the values and returning them all at once, a generator yields the values one at a time, which requires less
235:
action is used as the value of the invocation expression. The next time the same generator invocation is reached in a subsequent iteration, the execution of the generator's body is resumed after the
2817:
Java has had a standard interface for implementing iterators since its early days, and since Java 5, the "foreach" construction makes it easy to loop over objects that provide the
4173:, called a generator expression that aids in the creation of generators. The following extends the first example above by using a generator expression to compute squares from the
403:
Every expression (including loops) is a generator. The language has many generators built-in and even implements some of the logic semantics using the generator mechanism (
57:
5391:
5201:
utilizes generators to implement its goal directed evaluation. In Icon, generators can be invoked in contexts outside of the normal looping control structures.
262:
When eager evaluation is desirable (primarily when the sequence is finite, as otherwise evaluation will never terminate), one can either convert to a
3711:
out' in the iterator // An implicit declaration of I as an integer is therefore made here for I in 1..5 loop IO.WriteLn "I=", I
528:, it is simple to implement them using any framework that implements stackful coroutines, such as libdill. On POSIX platforms, when the cost of
513:
However, most of the time custom generators are implemented with the "suspend" keyword which functions exactly like the "yield" keyword in CLU.
5215:
5175:
104:
259:, such as sequences that would be expensive or impossible to compute at once. These include e.g. infinite sequences and live data streams.
76:
83:
1387:
Example parallel to Icon uses Raku (formerly/aka Perl 6) Range class as one of several ways to achieve generators with the language.
5481:
123:
169:
90:
5476:
161:
3726:
1620:
537:
334:
61:
223:
is created that encapsulates the state of the generator routine at its beginning, with arguments bound to the corresponding
374:
72:
3819:
2031:
330:
279:
224:
2140:
But more directly, Racket comes with a generator library for a more traditional generator specification. For example,
5198:
338:
326:
3810:
forms a sequence of squares of numbers from 0 to 14 by filtering out numbers from the range of numbers from 0 to 25.
4154:
statement is reached. The generator's frame is then frozen again, and the yielded value is returned to the caller.
2822:
322:
28:
50:
3703:
1438:
However, most of the time custom generators are implemented with "gather" and "take" keywords in a lazy context.
263:
220:
266:, or use a parallel construction that creates a list instead of a generator. For example, in Python a generator
5067:
521:
97:
5433:
4878:
generator below returns to each invocation 'goldenRatio next' a better approximation to the Golden Ratio.
5303:
165:
176:
and allows the caller to get started processing the first few values immediately. In short, a generator
1628:
216:
4161:
expression, allowing a generator to delegate part of its operations to another generator or iterable.
812:
functions. It's then possible to write generator-like classes by defining both the iterable methods (
378:
5308:
4150:
is called on the iterator, Python resumes the frozen frame, which executes normally until the next
3731:
3721:
2658:
Ruby supports generators (starting from version 1.9) in the form of the built-in
Enumerator class.
404:
5222:
373:
standard does not natively provide generators, yet various library implementations exist, such as
5321:
5280:
5079:
4170:
533:
256:
255:
Because generators compute their yielded values only on demand, they are useful for representing
5171:
529:
5294:
Liskov, B.; Snyder, A.; Atkinson, R.; Schaffert, C. (1977). "Abstraction mechanisms in CLU".
5313:
219:
inside loops. The first time that a generator invocation is reached in a loop, an iterator
137:
17:
3736:
since version 1.9.1. These can define a sequence (lazily evaluated, sequential access) via
5450:
5097:
1624:
173:
2034:
provides several related facilities for generators. First, its for-loop forms work with
227:. The generator's body is then executed in the context of that iterator until a special
5462:
5353:
5268:
524:
does not have generator functions as a language construct, but, as they are a subset of
5211:
545:
5150:
389:
A yield statement is used to implement iterators over user-defined data abstractions.
5470:
5325:
2825:
and other collections frameworks, typically provide iterators for all collections.)
5118:
4875:
801:
200:
192:
153:
3986:"""Generate prime numbers indefinitely as needed."""
5165:
832:) in the same class. For example, it is possible to write the following program:
5103:
4143:
540:
is desired, a very simple generator function framework can be implemented using
370:
39:
4279:
1918:
operator, used for parenthesization. This uses the standard adaptor function,
1215:
525:
350:
346:
145:
410:
Printing squares from 0 to 20 can be achieved using a co-routine by writing:
5410:
5257:
5253:
5249:
5112:
1451:
204:
196:
149:
5317:
4285:
An infinite
Fibonacci sequence can be written using a function generator:
1214:
Perl does not natively provide generators, but support is provided by the
5091:
5085:
4139:
3959:# Another generator, which produces prime numbers indefinitely as needed.
541:
185:
157:
2286:
implemented generators in PHP 5.5. Details can be found in the original
797:
5421:
5367:
5137:
2287:
5454:
4019:# If dividing n by all the numbers in p, up to and including sqrt(n),
325:(1975), were a prominent feature in the string manipulation language
297:
can be implemented as iteration through a generator, as in Python's
247:
action, execution of the generator body can also be terminated by a
5453:, David Stoutamire and Clemens Szyperski: Iteration abstraction in
1219:
4868:
1506:# Finish the loop of the caller using a 'break' exception
231:
action is encountered; at that time, the value provided with the
3597:
statements and they are applied in sequence on each iteration:
2283:
1447:
353:), and other languages. In CLU and C#, generators are called
342:
33:
1525:# Use a simple 'for' loop to do the actual generation
3081:// Save the iterator of a stream that generates fib sequence
5138:
What is the difference between an
Iterator and a Generator?
3465:// Method that takes an iterable input (possibly an array)
1390:
Printing squares from 0 to 20 can be achieved by writing:
191:
Generators can be implemented in terms of more expressive
5088:
for the concept of producing a list one element at a time
5082:
for another construct that generates a sequence of values
5032:
The expression below returns the next 10 approximations.
607:// will emit int values. Start of body of the generator.
3896:# Note that this iteration terminates normally, despite
3893:# Example use: printing out the integers from 10 to 20.
673:// stop, end of sequence. End of body of the generator.
5106:
for potentially infinite data by recursion instead of
3746:
that contain code that generates values. For example,
1631:
data constructor is generated on demand. For example,
1594:# Pull values from the generator until it is exhausted
5459:
5339:
4792:
The iterators package can be used for this purpose.
3743:
or an array (eagerly evaluated, indexed access) via
3740:, a list (eagerly evaluated, sequential access) via
592:// from $ emit to $ stop is a body of our generator:
1491:# Produce the result of , the name of the generator
1272:# New generator which can be called like a coderef.
932:A basic range implementation would look like that:
64:. Unsourced material may be challenged and removed.
5411:PEP 380 -- Syntax for Delegating to a Subgenerator
4282:(a.k.a. Harmony) introduced generator functions.
2650:statement is automatically a generator function.
2075:and these sequences are also first-class values:
1450:8.6, the generator mechanism is founded on named
5151:"General ways to traverse collections in Scheme"
4022:# produces a non-zero remainder then n is prime.
3899:# countfrom() being written as an infinite loop.
3046:super-interface BaseStream of Stream interface.
586:// place the constructor of our generator, e.g.
4138:In Python, a generator can be thought of as an
286:evaluates lazily (a generator or sequence) but
3822:in version 2.2 in 2001. An example generator:
4157:PEP 380 (implemented in Python 3.3) adds the
804:to be applied to any class that provides the
8:
5392:"Some Details on F# Computation Expressions"
5115:for even more generalization from subroutine
755:// "get next" generator invocation
5368:"What is the yield keyword used for in C#?"
5258:PEP 342: Coroutines via Enhanced Generators
243:action is encountered. In addition to the
29:Generator (disambiguation) § Computing
3706:, iterators are the basis of 'for' loops:
5307:
4425:// generator without an upper bound limit
124:Learn how and when to remove this message
5244:
5242:
532:per iteration is not a concern, or full
205:comparison of coroutines with generators
5130:
4169:Python has a syntax modeled on that of
2199:; infinite sequence of integers from 0
1245:# Enable generator { BLOCK } and yield
1222:co-routine framework. Example usage:
3321:"done with first iteration"
2663:# Generator from an Enumerator object
664:// returns next number in , reversed.
73:"Generator" computer programming
7:
589:// descent(int minv, int maxv) {...}
62:adding citations to reliable sources
5281:"PHP: Generators overview - Manual"
160:. A generator is very similar to a
5121:for generalization of control flow
4713:// picks up from where you stopped
2038:, which are a kind of a producer:
1906:is a non-strict list constructor,
1627:model, every datum created with a
25:
3455:An example C# 2.0 generator (the
1257:# Array reference to iterate over
681:This can then be iterated using:
5167:Encyclopedia of computer science
5100:for producing values when needed
5068:A hidden gem in Pharo: Generator
3468:// and returns all even numbers.
2288:Request for Comments: Generators
329:(1977) and are now available in
309:to the generator and then using
148:that can be used to control the
38:
5149:Kiselyov, Oleg (January 2004).
3593:It is possible to use multiple
2465:Fibonacci sequence with limit:
49:needs additional citations for
5340:"Structured Concurrency for C"
5254:PEP 289: Generator Expressions
5248:Python Enhancement Proposals:
2646:Any function which contains a
1344:# Call the generator 15 times.
1326:# get next letter from $ chars
661:// similar to yield in Python,
305:can be implemented as sending
1:
3222:// Print the first 5 elements
2293:Infinite Fibonacci sequence:
557:as in the following example:
321:Generators first appeared in
4809:# Example ------------------
4371:// bounded by upper limit 10
3327:// Print the next 5 elements
3042:Or get an Iterator from the
820:) and the iterator methods (
289:evaluates eagerly (a list).
18:Generator (computer science)
407:or "OR" is done this way).
270:can be evaluated to a list
5498:
5434:"Infinite generators in R"
5250:PEP 255: Simple Generators
3719:
2823:Java collections framework
239:action, until yet another
168:, in that a generator has
156:. All generators are also
26:
5296:Communications of the ACM
5199:Icon Programming Language
3818:Generators were added to
3430:done with first iteration
3105:// Generates Fib sequence
5482:Iteration in programming
5422:Generator functions in R
5164:Anthony Ralston (2000).
5034:
4880:
4794:
4287:
4179:
3824:
3748:
3729:provides generators via
3708:
3599:
3462:
3412:
3048:
2827:
2714:# Generator from a block
2660:
2467:
2295:
2142:
2077:
2040:
2018:squaresForNumbersUnder20
1994:
1920:
1633:
1456:
1392:
1224:
934:
834:
683:
559:
412:
391:
282:the sequence expression
4142:that contains a frozen
2268:; -> '(10 11 12)
764:"next number is %d
377:documented in CLtL2 or
215:Generators are usually
5477:Programming constructs
1218:module which uses the
5318:10.1145/359763.359789
5170:. Nature Pub. Group.
4497:// manually iterating
4165:Generator expressions
3720:Further information:
1096:// Iterator functions
1021:// Iterable functions
299:for x in range(1, 10)
5461:, 18(1):1-15 (1996)
5356:. 21 September 2008.
5269:yield (C# Reference)
4177:generator function:
3732:sequence expressions
3659:"New York"
195:constructs, such as
58:improve this article
27:For other uses, see
5354:"Generators in C++"
4171:list comprehensions
3722:Sequence expression
1497:# Do the generation
536:rather than merely
405:logical disjunction
5216:"A History of CLU"
5094:for an alternative
5080:List comprehension
3683:"London"
2819:java.lang.Iterable
5451:Stephen Omohundro
5436:. 5 January 2013.
5372:stackoverflow.com
5177:978-1-56159-248-7
3671:"Paris"
2282:The community of
530:context switching
134:
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16:(Redirected from
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5221:. Archived from
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2945:
2942:
2939:
2936:
2933:
2930:
2927:
2924:
2921:
2918:
2915:
2912:
2909:
2906:
2903:
2900:
2897:
2894:
2891:
2888:
2885:
2882:
2879:
2876:
2873:
2870:
2867:
2864:
2861:
2858:
2855:
2852:
2849:
2846:
2843:
2840:
2837:
2834:
2831:
2821:interface. (The
2820:
2808:
2805:
2802:
2799:
2796:
2793:
2790:
2787:
2784:
2781:
2778:
2775:
2772:
2769:
2766:
2763:
2760:
2757:
2754:
2751:
2748:
2745:
2742:
2739:
2736:
2733:
2730:
2727:
2724:
2721:
2718:
2715:
2712:
2709:
2706:
2703:
2700:
2697:
2694:
2691:
2688:
2685:
2682:
2679:
2676:
2673:
2670:
2667:
2664:
2649:
2642:
2639:
2636:
2633:
2630:
2627:
2624:
2621:
2618:
2615:
2612:
2609:
2606:
2603:
2600:
2597:
2594:
2591:
2588:
2585:
2582:
2579:
2576:
2573:
2570:
2567:
2564:
2561:
2558:
2555:
2552:
2549:
2546:
2543:
2540:
2537:
2534:
2531:
2528:
2525:
2522:
2519:
2516:
2513:
2510:
2507:
2504:
2501:
2498:
2495:
2492:
2489:
2486:
2483:
2480:
2477:
2474:
2471:
2461:
2458:
2455:
2452:
2449:
2446:
2443:
2440:
2437:
2434:
2431:
2428:
2425:
2422:
2419:
2416:
2413:
2410:
2407:
2404:
2401:
2398:
2395:
2392:
2389:
2386:
2383:
2380:
2377:
2374:
2371:
2368:
2365:
2362:
2359:
2356:
2353:
2350:
2347:
2344:
2341:
2338:
2335:
2332:
2329:
2326:
2323:
2320:
2317:
2314:
2311:
2308:
2305:
2302:
2299:
2269:
2266:
2263:
2260:
2257:
2254:
2251:
2248:
2245:
2242:
2239:
2236:
2233:
2230:
2227:
2224:
2221:
2218:
2215:
2212:
2209:
2206:
2203:
2200:
2197:
2194:
2191:
2188:
2185:
2182:
2179:
2176:
2173:
2170:
2167:
2164:
2161:
2158:
2157:racket/generator
2155:
2152:
2149:
2146:
2132:
2129:
2126:
2123:
2120:
2117:
2114:
2111:
2108:
2105:
2102:
2099:
2096:
2093:
2090:
2087:
2084:
2081:
2071:
2068:
2065:
2062:
2059:
2056:
2053:
2050:
2047:
2044:
2022:
2019:
2016:
2013:
2010:
2007:
2004:
2001:
1998:
1987:
1984:
1981:
1978:
1975:
1972:
1969:
1966:
1963:
1960:
1957:
1954:
1951:
1948:
1945:
1942:
1939:
1936:
1933:
1930:
1927:
1924:
1913:
1905:
1898:
1895:
1892:
1889:
1886:
1883:
1880:
1877:
1874:
1871:
1868:
1865:
1862:
1859:
1856:
1853:
1850:
1847:
1844:
1841:
1838:
1835:
1832:
1829:
1826:
1823:
1820:
1817:
1814:
1811:
1808:
1805:
1802:
1799:
1796:
1793:
1790:
1787:
1784:
1781:
1778:
1775:
1772:
1769:
1766:
1763:
1760:
1757:
1754:
1751:
1748:
1745:
1742:
1739:
1736:
1733:
1730:
1727:
1724:
1721:
1718:
1715:
1712:
1709:
1706:
1703:
1700:
1697:
1694:
1691:
1688:
1685:
1682:
1679:
1676:
1673:
1670:
1667:
1664:
1661:
1658:
1655:
1652:
1649:
1646:
1643:
1640:
1637:
1610:
1607:
1604:
1601:
1598:
1595:
1592:
1589:
1586:
1583:
1580:
1577:
1573:
1570:
1567:
1564:
1561:
1558:
1555:
1552:
1549:
1545:
1542:
1539:
1536:
1533:
1529:
1526:
1523:
1520:
1517:
1513:
1510:
1507:
1504:
1501:
1498:
1495:
1492:
1489:
1486:
1483:
1480:
1476:
1473:
1470:
1467:
1464:
1460:
1433:
1430:
1426:
1422:
1419:
1416:
1412:
1408:
1404:
1400:
1396:
1378:
1375:
1372:
1369:
1366:
1363:
1360:
1357:
1354:
1351:
1348:
1345:
1342:
1339:
1336:
1333:
1330:
1327:
1324:
1321:
1318:
1315:
1312:
1309:
1306:
1303:
1300:
1297:
1294:
1291:
1288:
1285:
1282:
1279:
1276:
1273:
1270:
1267:
1264:
1261:
1258:
1255:
1252:
1249:
1246:
1243:
1240:
1237:
1234:
1231:
1228:
1205:
1202:
1199:
1196:
1193:
1190:
1187:
1184:
1181:
1178:
1175:
1172:
1169:
1166:
1163:
1160:
1157:
1154:
1151:
1148:
1145:
1142:
1139:
1136:
1133:
1130:
1127:
1124:
1121:
1118:
1115:
1112:
1109:
1106:
1103:
1100:
1097:
1094:
1091:
1088:
1085:
1082:
1079:
1076:
1073:
1070:
1067:
1064:
1061:
1058:
1055:
1052:
1049:
1046:
1043:
1040:
1037:
1034:
1031:
1028:
1025:
1022:
1019:
1016:
1013:
1010:
1007:
1004:
1001:
998:
995:
992:
989:
986:
983:
980:
977:
974:
971:
968:
965:
962:
959:
956:
953:
950:
947:
944:
941:
938:
928:
925:
922:
919:
916:
913:
910:
907:
904:
901:
898:
895:
892:
889:
886:
883:
880:
877:
874:
871:
868:
865:
862:
859:
856:
853:
850:
847:
844:
841:
840:<iostream>
838:
831:
827:
823:
819:
815:
811:
807:
792:
789:
786:
783:
780:
777:
774:
771:
768:
765:
762:
759:
756:
753:
750:
747:
744:
741:
738:
735:
732:
729:
726:
723:
720:
717:
714:
711:
708:
705:
702:
699:
696:
693:
690:
687:
677:
674:
671:
668:
665:
662:
659:
656:
653:
650:
647:
644:
641:
638:
635:
632:
629:
626:
623:
620:
617:
614:
611:
608:
605:
602:
599:
596:
593:
590:
587:
584:
581:
578:
575:
572:
569:
566:
563:
509:
506:
503:
500:
497:
494:
491:
488:
485:
482:
479:
476:
473:
470:
467:
464:
461:
458:
455:
452:
449:
446:
443:
440:
437:
434:
431:
428:
425:
422:
419:
416:
312:
304:
300:
296:
288:
285:
277:
273:
269:
164:that returns an
138:computer science
129:
122:
118:
115:
109:
107:
66:
42:
34:
21:
5497:
5496:
5492:
5491:
5490:
5488:
5487:
5486:
5467:
5466:
5449:Stephan Murer,
5446:
5441:
5432:
5431:
5427:
5420:
5416:
5409:
5405:
5396:
5394:
5390:
5389:
5385:
5376:
5374:
5366:
5365:
5361:
5352:
5351:
5347:
5338:
5337:
5333:
5293:
5292:
5288:
5279:
5278:
5274:
5267:
5263:
5247:
5240:
5231:
5229:
5225:
5218:
5212:Liskov, Barbara
5210:
5209:
5205:
5196:
5192:
5182:
5180:
5178:
5163:
5162:
5158:
5148:
5147:
5143:
5136:
5132:
5128:
5098:Lazy evaluation
5076:
5064:
5063:
5060:
5056:
5052:
5049:
5046:
5042:
5039:
5036:
5030:
5029:
5026:
5023:
5020:
5017:
5013:
5009:
5006:
5003:
5000:
4997:
4994:
4991:
4988:
4985:
4982:
4979:
4976:
4973:
4969:
4966:
4963:
4959:
4956:
4953:
4950:
4947:
4944:
4941:
4938:
4934:
4931:
4928:
4925:
4922:
4919:
4916:
4913:
4910:
4907:
4904:
4901:
4898:
4895:
4891:
4888:
4885:
4882:
4869:Pharo Smalltalk
4865:
4860:
4859:
4856:
4853:
4850:
4847:
4844:
4841:
4838:
4835:
4832:
4829:
4826:
4823:
4820:
4817:
4814:
4811:
4808:
4805:
4802:
4799:
4796:
4790:
4785:
4784:
4781:
4778:
4775:
4772:
4769:
4766:
4763:
4760:
4757:
4754:
4751:
4748:
4745:
4742:
4739:
4736:
4733:
4730:
4727:
4724:
4721:
4718:
4715:
4712:
4709:
4706:
4703:
4700:
4697:
4694:
4691:
4688:
4685:
4682:
4679:
4676:
4673:
4670:
4667:
4664:
4661:
4658:
4655:
4652:
4649:
4646:
4643:
4640:
4637:
4634:
4631:
4628:
4625:
4622:
4619:
4616:
4613:
4610:
4607:
4604:
4601:
4598:
4595:
4592:
4589:
4586:
4583:
4580:
4577:
4574:
4571:
4568:
4565:
4562:
4559:
4556:
4553:
4550:
4547:
4544:
4541:
4538:
4535:
4532:
4529:
4526:
4523:
4520:
4517:
4514:
4511:
4508:
4505:
4502:
4499:
4496:
4493:
4490:
4487:
4484:
4481:
4478:
4475:
4472:
4469:
4466:
4463:
4460:
4457:
4454:
4451:
4448:
4445:
4442:
4439:
4436:
4433:
4430:
4427:
4424:
4421:
4418:
4415:
4412:
4409:
4406:
4403:
4400:
4397:
4394:
4391:
4388:
4385:
4382:
4379:
4376:
4373:
4370:
4367:
4364:
4361:
4358:
4355:
4352:
4349:
4346:
4343:
4340:
4337:
4334:
4331:
4328:
4325:
4322:
4319:
4316:
4313:
4310:
4307:
4304:
4301:
4298:
4295:
4292:
4289:
4277:
4272:
4271:
4268:
4265:
4262:
4259:
4256:
4253:
4250:
4247:
4244:
4241:
4238:
4235:
4232:
4229:
4226:
4223:
4220:
4217:
4214:
4211:
4208:
4205:
4202:
4199:
4196:
4193:
4190:
4187:
4184:
4181:
4174:
4167:
4158:
4151:
4147:
4136:
4135:
4132:
4129:
4126:
4123:
4120:
4117:
4114:
4111:
4108:
4105:
4102:
4099:
4096:
4093:
4090:
4087:
4084:
4081:
4078:
4075:
4072:
4069:
4066:
4063:
4060:
4057:
4054:
4051:
4048:
4045:
4042:
4039:
4036:
4033:
4030:
4027:
4024:
4021:
4018:
4015:
4012:
4009:
4006:
4003:
4000:
3997:
3994:
3991:
3988:
3985:
3982:
3979:
3976:
3973:
3970:
3967:
3964:
3961:
3958:
3955:
3952:
3949:
3946:
3943:
3940:
3937:
3934:
3931:
3928:
3925:
3922:
3919:
3916:
3913:
3910:
3907:
3904:
3901:
3898:
3895:
3892:
3889:
3886:
3883:
3880:
3877:
3874:
3871:
3868:
3865:
3862:
3859:
3856:
3853:
3850:
3847:
3844:
3841:
3838:
3835:
3832:
3829:
3826:
3816:
3808:
3807:
3804:
3801:
3798:
3795:
3792:
3789:
3786:
3783:
3780:
3777:
3774:
3771:
3768:
3765:
3762:
3759:
3756:
3753:
3750:
3744:
3741:
3737:
3724:
3718:
3713:
3712:
3700:
3695:
3694:
3691:
3688:
3685:
3682:
3679:
3676:
3673:
3670:
3667:
3664:
3661:
3658:
3655:
3652:
3649:
3646:
3643:
3640:
3637:
3634:
3631:
3628:
3625:
3622:
3619:
3616:
3613:
3610:
3607:
3604:
3601:
3594:
3591:
3590:
3587:
3584:
3581:
3578:
3575:
3572:
3569:
3566:
3563:
3560:
3557:
3554:
3551:
3548:
3545:
3542:
3539:
3536:
3533:
3530:
3527:
3524:
3521:
3518:
3515:
3512:
3509:
3506:
3503:
3500:
3497:
3494:
3491:
3488:
3485:
3482:
3479:
3476:
3473:
3470:
3467:
3464:
3456:
3453:
3448:
3447:
3444:
3441:
3438:
3435:
3432:
3429:
3426:
3423:
3420:
3417:
3414:
3408:
3407:
3404:
3401:
3398:
3395:
3392:
3389:
3386:
3383:
3380:
3377:
3374:
3371:
3368:
3365:
3362:
3359:
3356:
3353:
3350:
3347:
3344:
3341:
3338:
3335:
3332:
3329:
3326:
3323:
3320:
3317:
3314:
3311:
3308:
3305:
3302:
3299:
3296:
3293:
3290:
3287:
3284:
3281:
3278:
3275:
3272:
3269:
3266:
3263:
3260:
3257:
3254:
3251:
3248:
3245:
3242:
3239:
3236:
3233:
3230:
3227:
3224:
3221:
3218:
3215:
3212:
3209:
3206:
3203:
3200:
3197:
3194:
3191:
3188:
3185:
3182:
3179:
3176:
3173:
3170:
3167:
3164:
3161:
3158:
3155:
3152:
3149:
3146:
3143:
3140:
3137:
3134:
3131:
3128:
3125:
3122:
3119:
3116:
3113:
3110:
3107:
3104:
3101:
3098:
3095:
3092:
3089:
3086:
3083:
3080:
3077:
3074:
3071:
3068:
3065:
3062:
3059:
3056:
3053:
3050:
3040:
3039:
3036:
3033:
3030:
3027:
3024:
3021:
3018:
3015:
3012:
3009:
3006:
3003:
3000:
2997:
2994:
2991:
2988:
2985:
2982:
2979:
2976:
2973:
2970:
2967:
2964:
2961:
2958:
2955:
2952:
2949:
2946:
2943:
2940:
2937:
2934:
2931:
2928:
2925:
2922:
2919:
2916:
2913:
2910:
2907:
2904:
2901:
2898:
2895:
2892:
2889:
2886:
2883:
2880:
2877:
2874:
2871:
2868:
2865:
2862:
2859:
2856:
2853:
2850:
2847:
2844:
2841:
2838:
2835:
2832:
2829:
2818:
2815:
2810:
2809:
2806:
2803:
2800:
2797:
2794:
2791:
2788:
2785:
2782:
2779:
2776:
2773:
2770:
2767:
2764:
2761:
2758:
2755:
2752:
2749:
2746:
2743:
2740:
2737:
2734:
2731:
2728:
2725:
2722:
2719:
2716:
2713:
2710:
2707:
2704:
2701:
2698:
2695:
2692:
2689:
2686:
2683:
2680:
2677:
2674:
2671:
2668:
2665:
2662:
2656:
2647:
2644:
2643:
2640:
2637:
2634:
2631:
2628:
2625:
2622:
2619:
2616:
2613:
2610:
2607:
2604:
2601:
2598:
2595:
2592:
2589:
2586:
2583:
2580:
2577:
2574:
2571:
2568:
2565:
2562:
2559:
2556:
2553:
2550:
2547:
2544:
2541:
2538:
2535:
2532:
2529:
2526:
2523:
2520:
2517:
2514:
2511:
2508:
2505:
2502:
2499:
2496:
2493:
2490:
2487:
2484:
2481:
2478:
2475:
2472:
2469:
2463:
2462:
2459:
2456:
2453:
2450:
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2255:
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2240:
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2222:
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2017:
2014:
2011:
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1644:
1641:
1638:
1635:
1625:lazy evaluation
1617:
1612:
1611:
1608:
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1602:
1599:
1596:
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1471:
1468:
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1402:
1398:
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1379:
1376:
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1367:
1364:
1361:
1358:
1355:
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1343:
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1337:
1334:
1331:
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1322:
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1313:
1310:
1307:
1304:
1301:
1298:
1295:
1292:
1289:
1286:
1283:
1280:
1277:
1274:
1271:
1268:
1265:
1262:
1259:
1256:
1253:
1251:Coro::Generator
1250:
1247:
1244:
1241:
1238:
1235:
1232:
1229:
1226:
1216:Coro::Generator
1212:
1207:
1206:
1203:
1200:
1197:
1194:
1191:
1188:
1185:
1182:
1179:
1176:
1173:
1170:
1167:
1164:
1161:
1158:
1155:
1152:
1149:
1146:
1143:
1140:
1137:
1134:
1131:
1128:
1125:
1122:
1119:
1116:
1113:
1110:
1107:
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1101:
1098:
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1089:
1086:
1083:
1080:
1077:
1074:
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1068:
1065:
1062:
1059:
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1041:
1038:
1035:
1032:
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1026:
1023:
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1017:
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1008:
1005:
1002:
999:
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990:
987:
984:
981:
978:
975:
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963:
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951:
948:
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926:
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914:
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905:
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872:
869:
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848:
845:
842:
839:
836:
829:
825:
821:
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813:
809:
805:
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790:
787:
784:
781:
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775:
772:
769:
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748:
745:
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417:
414:
401:
396:
395:
387:
367:
357:, and in Ruby,
319:
310:
302:
298:
295:for x = 1 to 10
294:
287:
283:
275:
271:
267:
213:
199:or first-class
180:a function but
152:behaviour of a
130:
119:
113:
110:
67:
65:
55:
43:
32:
23:
22:
15:
12:
11:
5:
5495:
5493:
5485:
5484:
5479:
5469:
5468:
5465:
5464:
5445:
5442:
5440:
5439:
5425:
5414:
5403:
5383:
5359:
5345:
5331:
5309:10.1.1.112.656
5302:(8): 564–576.
5286:
5272:
5261:
5238:
5214:(April 1992).
5203:
5190:
5176:
5156:
5141:
5129:
5127:
5124:
5123:
5122:
5116:
5110:
5101:
5095:
5089:
5083:
5075:
5072:
5035:
4881:
4864:
4861:
4795:
4789:
4786:
4288:
4276:
4273:
4180:
4166:
4163:
3825:
3815:
3812:
3749:
3717:
3714:
3709:
3699:
3696:
3608:CityCollection
3600:
3463:
3452:
3449:
3413:
3049:
2828:
2814:
2811:
2661:
2655:
2652:
2468:
2296:
2279:
2276:
2143:
2078:
2041:
2028:
2025:
1997:squaresUnder20
1995:
1921:
1634:
1616:
1613:
1457:
1443:
1440:
1393:
1384:
1381:
1359:"\n"
1225:
1211:
1208:
935:
835:
684:
560:
553:
550:
518:
515:
413:
400:
397:
392:
386:
383:
366:
363:
318:
315:
212:
209:
132:
131:
46:
44:
37:
24:
14:
13:
10:
9:
6:
4:
3:
2:
5494:
5483:
5480:
5478:
5475:
5474:
5472:
5463:
5460:
5456:
5452:
5448:
5447:
5443:
5435:
5429:
5426:
5423:
5418:
5415:
5412:
5407:
5404:
5393:
5387:
5384:
5373:
5369:
5363:
5360:
5355:
5349:
5346:
5341:
5335:
5332:
5327:
5323:
5319:
5315:
5310:
5305:
5301:
5297:
5290:
5287:
5282:
5276:
5273:
5270:
5265:
5262:
5259:
5255:
5251:
5245:
5243:
5239:
5228:on 2003-09-17
5224:
5217:
5213:
5207:
5204:
5200:
5194:
5191:
5179:
5173:
5169:
5168:
5160:
5157:
5152:
5145:
5142:
5139:
5134:
5131:
5125:
5120:
5117:
5114:
5111:
5109:
5105:
5102:
5099:
5096:
5093:
5090:
5087:
5084:
5081:
5078:
5077:
5073:
5071:
5069:
5033:
4879:
4877:
4872:
4870:
4862:
4793:
4787:
4286:
4283:
4281:
4274:
4178:
4172:
4164:
4162:
4155:
4145:
4141:
3823:
3821:
3813:
3811:
3747:
3735:
3733:
3728:
3723:
3715:
3707:
3705:
3697:
3644:GetEnumerator
3598:
3461:
3450:
3411:
3047:
3045:
2826:
2824:
2812:
2659:
2653:
2651:
2466:
2294:
2291:
2289:
2285:
2277:
2275:
2141:
2138:
2076:
2039:
2037:
2033:
2026:
1993:
1919:
1917:
1916:"called-with"
1909:
1632:
1630:
1626:
1622:
1614:
1455:
1453:
1449:
1441:
1439:
1391:
1388:
1382:
1223:
1221:
1217:
1209:
933:
833:
803:
802:foreach loops
799:
682:
558:
551:
549:
547:
543:
539:
535:
531:
527:
523:
516:
514:
411:
408:
406:
398:
390:
384:
382:
380:
376:
372:
364:
362:
360:
356:
352:
348:
344:
340:
336:
332:
328:
324:
316:
314:
313:in the loop.
308:
290:
281:
265:
260:
258:
253:
250:
246:
242:
238:
234:
230:
226:
222:
218:
210:
208:
206:
202:
201:continuations
198:
194:
189:
187:
183:
179:
175:
171:
167:
163:
159:
155:
151:
147:
143:
139:
128:
125:
117:
106:
103:
99:
96:
92:
89:
85:
82:
78:
75: –
74:
70:
69:Find sources:
63:
59:
53:
52:
47:This article
45:
41:
36:
35:
30:
19:
5458:
5428:
5417:
5406:
5395:. Retrieved
5386:
5375:. Retrieved
5371:
5362:
5348:
5334:
5299:
5295:
5289:
5275:
5264:
5230:. Retrieved
5223:the original
5206:
5193:
5181:. Retrieved
5166:
5159:
5144:
5133:
5119:Continuation
5107:
5066:See more in
5065:
5031:
4876:Golden ratio
4873:
4866:
4791:
4284:
4280:ECMAScript 6
4278:
4168:
4156:
4137:
3817:
3809:
3730:
3725:
3701:
3595:yield return
3592:
3454:
3409:
3043:
3041:
2816:
2657:
2645:
2464:
2292:
2281:
2272:
2139:
2135:
2119:"i = ~s
2074:
2058:"i = ~s
2035:
2030:
1990:
1915:
1907:
1901:
1819:notDivisible
1759:notDivisible
1618:
1445:
1437:
1389:
1386:
1213:
931:
795:
680:
555:
520:
512:
409:
402:
388:
368:
358:
354:
320:
306:
291:
261:
254:
248:
244:
240:
236:
232:
228:
214:
193:control flow
190:
182:behaves like
181:
177:
141:
135:
120:
111:
101:
94:
87:
80:
68:
56:Please help
51:verification
48:
5104:Corecursion
5021:goldenRatio
4883:goldenRatio
4867:Example in
4842:'c'
4836:'b'
4830:'a'
4146:. Whenever
4144:stack frame
3738:seq { ... }
3632:IEnumerator
3614:IEnumerable
3495:IEnumerable
3477:IEnumerable
3393:myGenerator
3288:myGenerator
3096:myGenerator
1623:, with its
562:$ generator
538:concurrency
534:parallelism
371:Common Lisp
359:enumerators
301:. Further,
284:seq { ... }
278:, while in
276:l = list(g)
5471:Categories
5444:References
5397:2007-12-14
5377:2018-01-01
5232:2006-01-05
4275:ECMAScript
4159:yield from
3010:myIterable
2872:myIterable
2723:Enumerator
2672:Enumerator
1914:is just a
1687:from10to20
1681:from10to20
1629:non-strict
1514:codebreak
1452:coroutines
826:operator++
822:operator!=
796:Moreover,
526:coroutines
369:The final
351:ES6/ES2015
347:ECMAScript
225:parameters
197:coroutines
178:looks like
170:parameters
84:newspapers
5304:CiteSeerX
5113:Coroutine
5037:Character
4889:Generator
4863:Smalltalk
4803:iterators
4509:fibonacci
4443:fibonacci
4389:fibonacci
4296:fibonacci
4209:countfrom
4175:countfrom
4064:takewhile
4058:itertools
3965:itertools
3911:countfrom
3842:countfrom
2599:fibonacci
2491:Generator
2473:fibonacci
2421:fibonacci
2403:$ current
2388:$ current
2376:$ current
2364:$ current
2328:$ current
2310:Generator
2301:fibonacci
2226:ints-from
2184:generator
2172:ints-from
2036:sequences
2003:takeWhile
1983:otherwise
1971:takeWhile
1932:takeWhile
1923:takeWhile
1861:takeWhile
1801:nextPrime
1795:otherwise
1774:nextPrime
1750:nextPrime
1741:nextPrime
1711:countFrom
1693:takeWhile
1663:countFrom
1648:countFrom
1636:countFrom
1535:generator
1475:coroutine
1461:generator
1350:$ letters
1284:generator
1278:$ letters
830:operator*
355:iterators
158:iterators
150:iteration
142:generator
114:July 2007
5326:17343380
5092:Iteratee
5086:Iterator
5074:See also
5057:collect:
4908:x y z r
4848:nextElem
4290:function
4140:iterator
3980:Iterator
3863:Iterator
3836:Iterator
3410:Output:
3216:iterator
3084:Iterator
3004:iterator
2860:Iterable
2629:$ number
2614:$ number
2470:function
2442:$ number
2430:$ number
2298:function
2092:in-range
2086:10-to-20
1503:$ script
1477:genapply
1409:) ->
1332:$ letter
1317:@$ chars
1311:$ letter
1239:warnings
1177:operator
1150:operator
1102:operator
900:<<
894:<<
837:#include
542:pthreads
333:(2001),
317:Timeline
311:continue
186:iterator
162:function
4974:asFloat
4797:library
4740:console
4680:console
4647:console
4614:console
4581:console
4548:console
4515:console
4452:console
4404:console
4230:squares
4182:squares
3531:numbers
3516:foreach
3507:numbers
3489:GetEven
3387:println
3315:println
3282:println
3111:iterate
3090:Integer
3034:println
3016:forEach
2884:iterate
2866:Integer
2759:yielder
2738:yielder
2593:foreach
2539:$ limit
2482:$ limit
2415:foreach
2154:require
1642:Integer
1621:Haskell
1615:Haskell
1263:$ chars
946:private
800:allows
719:descent
649:$ yield
568:descent
472:squares
427:squares
418:squares
349:(as of
257:streams
217:invoked
146:routine
98:scholar
5455:Sather
5324:
5306:
5183:11 May
5174:
5014:repeat
5007:yield:
4937:[
4731:fibGen
4692:fibGen
4659:fibGen
4626:fibGen
4593:fibGen
4560:fibGen
4527:fibGen
4503:fibGen
4148:next()
4115:append
4070:lambda
3971:primes
3962:import
3833:import
3830:typing
3820:Python
3814:Python
3680:return
3668:return
3656:return
3638:string
3629:public
3620:string
3602:public
3576:number
3573:return
3546:number
3525:number
3474:static
3471:public
3375:System
3303:System
3270:System
3102:Stream
3051:record
3044:Java 8
3022:System
2878:Stream
2830:record
2635:"
2626:"
2454:"
2448:"
2394:$ last
2382:$ last
2370:$ last
2316:$ last
2217:define
2166:define
2148:racket
2145:#lang
2125:"
2116:printf
2083:define
2064:"
2055:printf
2032:Racket
2027:Racket
1992:used:
1910:, and
1902:where
1897:primes
1723:primes
1717:primes
1519:$ body
1509:return
1482:script
1427:;
1413:{
1405:(* **
1401:.. *).
1230:strict
1192:return
1129:return
1081:return
1045:return
970:public
918:return
782:return
770:"
758:printf
667:$ stop
595:$ emit
433:create
375:SERIES
331:Python
307:finish
249:finish
221:object
174:memory
100:
93:
86:
79:
71:
5322:S2CID
5226:(PDF)
5219:(PDF)
5126:Notes
5108:yield
5043:join:
4815:<-
4776:break
4770:10000
4722:const
4704:value
4671:value
4638:value
4605:value
4572:value
4539:value
4488:break
4482:10000
4434:const
4380:const
4350:yield
4341:limit
4338:<=
4329:limit
4320:while
4302:limit
4269:break
4251:print
4242:<=
4152:yield
4103:yield
4088:<=
4010:while
3989:yield
3977:->
3956:break
3938:print
3929:<=
3878:yield
3869:while
3860:->
3793:yield
3677:yield
3665:yield
3653:yield
3605:class
3570:yield
3457:yield
3201:->
3141:->
2989:->
2965:limit
2914:->
2798:count
2789:times
2765:yield
2717:count
2702:chars
2693:times
2666:chars
2648:yield
2548:yield
2524:while
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