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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 return
基于SpringBoot简洁优雅的个人博客系统.zip （1131个子文件） 
blog.log.2021-07-13.0 147KB AUTHORS 6KB AUTHORS 6KB Blog.class 7KB BlogServiceImpl.class 7KB CommentServiceImpl.class 6KB BlogController.class 5KB TypeController.class 5KB TagController.class 5KB HttpClient.class 5KB IndexController.class 4KB TagServiceImpl.class 4KB Comment.class 4KB User.class 4KB RecordServiceImpl.class 3KB TypeServiceImpl.class 3KB BlogServiceImpl$1.class 3KB MarkdownUtils.class 3KB BaiduApi.class 3KB CommentController.class 3KB LoginController.class 3KB TypeShowController.class 3KB IPUtils.class 2KB TagShowController.class 2KB BaiduApi$Address.class 2KB Record.class 2KB BlogServiceImpl$2.class 2KB WebsiteInfoServiceImpl.class 2KB WebsiteRecordController.class 2KB ControllerExceptionHandler.class 2KB Type.class 2KB BlogRepository.class 2KB Tag.class 2KB WebsiteInfoController.class 2KB BlogService.class 2KB MD5Utils.class 2KB MyBeanUtils.class 2KB PushWechatMessage.class 2KB FriendLink.class 1KB WebConfig.class 1KB AboutShowController.class 1KB MarkdownUtils$CustomAttributeProvider.class 1KB WebsiteInfo.class 1KB RecordServiceImpl$1.class 1KB LoginInterceptor.class 1KB TagService.class 1021B UserServiceImpl.class 1015B BlogQuery.class 1008B DdosTestMain.class 1008B TypeService.class 920B MarkdownUtils$1.class 901B FriendLinkServiceImpl.class 855B SkillServiceImpl.class 815B NotFoundException.class 801B BlogApplication.class 773B TypeRepository.class 699B TagRepository.class 693B Skill.class 655B CommentRepository.class 613B RecordRepository.class 543B RecordService.class 512B CommentService.class 499B WebsiteInfoRepository.class 430B UserRepository.class 428B WebsiteInfoService.class 386B FriendLinkRepository.class 345B SkillRepository.class 330B IpInfo.class 279B FriendLinkService.class 249B SkillService.class 234B UserService.class 211B editormd.css 76KB editormd.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 animate.css 23KB animate.css 23KB codemirror.css 8KB codemirror.css 8KB typo.css 7KB typo.css 7KB codemirror.min.css 5KB codemirror.min.css 5KB mdn-like.css 5KB mdn-like.css 5KB solarized.css 5KB solarized.css 5KB merge.css 3KB merge.css 3KB me.css 3KB me.css 3KB lint.css 3KB lint.css 3KB prism.css 3KB共 1131 条
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