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/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2011, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala.collection
import generic._
import mutable.{ Builder, ListBuffer }
import annotation.{tailrec, migration, bridge}
import annotation.unchecked.{ uncheckedVariance => uV }
import parallel.ParIterable
/** A template trait for traversable collections of type `Traversable[A]`.
*
* $traversableInfo
* @define mutability
* @define traversableInfo
* This is a base trait of all kinds of $mutability Scala collections. It
* implements the behavior common to all collections, in terms of a method
* `foreach` with signature:
* {{{
* def foreach[U](f: Elem => U): Unit
* }}}
* Collection classes mixing in this trait provide a concrete
* `foreach` method which traverses all the
* elements contained in the collection, applying a given function to each.
* They also need to provide a method `newBuilder`
* which creates a builder for collections of the same kind.
*
* A traversable class might or might not have two properties: strictness
* and orderedness. Neither is represented as a type.
*
* The instances of a strict collection class have all their elements
* computed before they can be used as values. By contrast, instances of
* a non-strict collection class may defer computation of some of their
* elements until after the instance is available as a value.
* A typical example of a non-strict collection class is a
* <a href="../immutable/Stream.html" target="ContentFrame">
* `scala.collection.immutable.Stream`</a>.
* A more general class of examples are `TraversableViews`.
*
* If a collection is an instance of an ordered collection class, traversing
* its elements with `foreach` will always visit elements in the
* same order, even for different runs of the program. If the class is not
* ordered, `foreach` can visit elements in different orders for
* different runs (but it will keep the same order in the same run).'
*
* A typical example of a collection class which is not ordered is a
* `HashMap` of objects. The traversal order for hash maps will
* depend on the hash codes of its elements, and these hash codes might
* differ from one run to the next. By contrast, a `LinkedHashMap`
* is ordered because it's `foreach` method visits elements in the
* order they were inserted into the `HashMap`.
*
* @author Martin Odersky
* @version 2.8
* @since 2.8
* @tparam A the element type of the collection
* @tparam Repr the type of the actual collection containing the elements.
*
* @define Coll Traversable
* @define coll traversable collection
*/
trait TraversableLike[+A, +Repr] extends HasNewBuilder[A, Repr]
with FilterMonadic[A, Repr]
with TraversableOnce[A]
with GenTraversableLike[A, Repr]
with Parallelizable[A, ParIterable[A]]
{
self =>
import Traversable.breaks._
/** The type implementing this traversable */
protected type Self = Repr
/** The collection of type $coll underlying this `TraversableLike` object.
* By default this is implemented as the `TraversableLike` object itself,
* but this can be overridden.
*/
def repr: Repr = this.asInstanceOf[Repr]
/** The underlying collection seen as an instance of `$Coll`.
* By default this is implemented as the current collection object itself,
* but this can be overridden.
*/
protected[this] def thisCollection: Traversable[A] = this.asInstanceOf[Traversable[A]]
/** A conversion from collections of type `Repr` to `$Coll` objects.
* By default this is implemented as just a cast, but this can be overridden.
*/
protected[this] def toCollection(repr: Repr): Traversable[A] = repr.asInstanceOf[Traversable[A]]
/** Creates a new builder for this collection type.
*/
protected[this] def newBuilder: Builder[A, Repr]
protected[this] def parCombiner = ParIterable.newCombiner[A]
/** Applies a function `f` to all elements of this $coll.
*
* Note: this method underlies the implementation of most other bulk operations.
* It's important to implement this method in an efficient way.
*
*
* @param f the function that is applied for its side-effect to every element.
* The result of function `f` is discarded.
*
* @tparam U the type parameter describing the result of function `f`.
* This result will always be ignored. Typically `U` is `Unit`,
* but this is not necessary.
*
* @usecase def foreach(f: A => Unit): Unit
*/
def foreach[U](f: A => U): Unit
/** Tests whether this $coll is empty.
*
* @return `true` if the $coll contain no elements, `false` otherwise.
*/
def isEmpty: Boolean = {
var result = true
breakable {
for (x <- this) {
result = false
break
}
}
result
}
/** Tests whether this $coll is known to have a finite size.
* All strict collections are known to have finite size. For a non-strict collection
* such as `Stream`, the predicate returns `true` if all elements have been computed.
* It returns `false` if the stream is not yet evaluated to the end.
*
* Note: many collection methods will not work on collections of infinite sizes.
*
* @return `true` if this collection is known to have finite size, `false` otherwise.
*/
def hasDefiniteSize = true
def ++[B >: A, That](that: GenTraversableOnce[B])(implicit bf: CanBuildFrom[Repr, B, That]): That = {
val b = bf(repr)
if (that.isInstanceOf[IndexedSeqLike[_, _]]) b.sizeHint(this, that.seq.size)
b ++= thisCollection
b ++= that.seq
b.result
}
@bridge
def ++[B >: A, That](that: TraversableOnce[B])(implicit bf: CanBuildFrom[Repr, B, That]): That =
++(that: GenTraversableOnce[B])(bf)
/** Concatenates this $coll with the elements of a traversable collection.
* It differs from ++ in that the right operand determines the type of the
* resulting collection rather than the left one.
*
* @param that the traversable to append.
* @tparam B the element type of the returned collection.
* @tparam That $thatinfo
* @param bf $bfinfo
* @return a new co
个人博客页面，不代表最终版本，为SSH项目 .zip （1089个子文件） 
AUTHORS 6KB AUTHORS 6KB Blog.class 11KB BlogServiceImpl.class 7KB Comment.class 6KB User.class 6KB BlogController.class 6KB TypeController.class 5KB TagController.class 5KB TagServieceImpl.class 4KB CommentServiceImpl.class 4KB TypeServiceImpl.class 4KB BlogServiceImpl$1.class 4KB IndexController.class 4KB LogAspect.class 3KB CommentController.class 3KB Tag.class 3KB BlogServiceImpl$2.class 3KB Type.class 3KB ShowTypeController.class 3KB MarkDownUtils.class 2KB LoginController.class 2KB ShowTagsController.class 2KB BlogRepository.class 2KB BlogQuery.class 2KB BlogServiceImpl$3.class 2KB ControllerExceptionHandler.class 2KB BlogService.class 2KB MD5Utils.class 2KB MyBeanUtils.class 2KB WebConfig.class 1KB archivesController.class 1KB LogAspect$RequestLog.class 1KB MarkDownUtils$CustomAttributeProvider.class 1KB ShowAboutMeController.class 1KB LoginInterceptor.class 1KB BlogApplication.class 1KB TagService.class 1KB UserServiceImpl.class 1003B TypeService.class 987B MarkDownUtils$1.class 887B NotFoundException.class 832B TypeRepository.class 732B TagRepository.class 726B CommentRepository.class 591B BlogApplicationTests.class 523B UserRepository.class 467B CommentService.class 398B UserService.class 336B editormd.css 76KB editormd.css 76KB animate.css 76KB animate.css 76KB editormd.min.css 60KB editormd.min.css 60KB editormd.preview.css 55KB editormd.preview.css 55KB editormd.preview.min.css 44KB editormd.preview.min.css 44KB ambiance.css 26KB ambiance.css 26KB typo.css 8KB typo.css 8KB codemirror.css 8KB codemirror.css 8KB codemirror.min.css 5KB codemirror.min.css 5KB mdn-like.css 5KB mdn-like.css 5KB solarized.css 5KB solarized.css 5KB custom.css 4KB custom.css 4KB merge.css 3KB merge.css 3KB lint.css 3KB lint.css 3KB xq-dark.css 3KB xq-dark.css 3KB lesser-dark.css 2KB lesser-dark.css 2KB pastel-on-dark.css 2KB pastel-on-dark.css 2KB xq-light.css 2KB xq-light.css 2KB tomorrow-night-eighties.css 2KB tomorrow-night-eighties.css 2KB editormd.logo.css 2KB editormd.logo.css 2KB erlang-dark.css 2KB erlang-dark.css 2KB zenburn.css 2KB zenburn.css 2KB prism.css 2KB prism.css 2KB twilight.css 2KB twilight.css 2KB midnight.css 2KB midnight.css 2KB vibrant-ink.css 2KB共 1089 条
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