Scala Library
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scala/collection/RollbackIterator.scala
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class
RollbackIterator[+A](underlying : Iterator[A])
extends
Default[A]Method Summary | |
protected def
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fill
(sz : Int) : Seq[A]
used to fill lookahead buffer.
sz can be used by implementations as a heauristic to determine how many elements are desired |
override def
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next
: A
Returns the next element.
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def
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read
(f : => Unit) : Boolean
returns true if any elements are iterated over during
f 's execution |
override def
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readIfStartsWith
(seq : Seq[Any]) : Boolean
if elements of
seq will be iterated over next in this iterator,
returns true and iterates over these elements |
def
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remember
[T](g : => (Seq[A]) => T) : T
remembers elements iterated over during
g 's execution
and provides these elements to the result of g 's execution |
def
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tryRead
[T](f : => Option[T]) : Option[T]
will rollback all elements iterated during
f 's execution if f return false |
Methods inherited from Default | |
putBack, defaultPeek, hasNext, peekList |
Methods inherited from PutBack | |
counted, flushFrom |
Methods inherited from Advanced | |
head, peek, startsWith, toString, advanced |
Methods inherited from BufferedIterator | |
headOpt, buffered, readIf, readWhile |
Methods inherited from Iterator | |
take, drop, slice, map, append, ++, flatMap, filter, takeWhile, dropWhile, zip, zipWithIndex, foreach, forall, exists, contains, find, findIndexOf, indexOf, foldLeft, foldRight, /:, :\, reduceLeft, reduceRight, duplicate, copyToArray, readInto, readInto, readInto, copyToBuffer, toList, collect, mkString, mkString, mkString, addString |
Methods inherited from AnyRef | |
getClass, hashCode, equals, clone, notify, notifyAll, wait, wait, wait, finalize, ==, !=, eq, ne, synchronized |
Methods inherited from Any | |
==, !=, isInstanceOf, asInstanceOf |
Method Details |
sz
can be used by implementations as a heauristic to determine how many elements are desiredoverride
def
next : A
f
's execution if f
return falseg
's execution
and provides these elements to the result of g
's executionf
's executionseq
will be iterated over next in this iterator,
returns true and iterates over these elements
Scala Library
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