blob: 4552867a9f65a835ff23045a47e75548db73bf35 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
|
/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2010, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
package scala.collection
package generic
import mutable.Builder
/** A template class for companion objects of ``regular'' collection classes
* represent an unconstrained higher-kinded type. Typically
* such classes inherit from trait `GenericTraversableTemplate`.
* @tparam CC The type constructor representing the collection class.
* @see GenericTraversableTemplate
* @author Martin Odersky
* @since 2.8
* @define coll collection
* @define Coll CC
*/
abstract class GenericCompanion[+CC[X] <: Traversable[X]] {
/** The underlying collection type with unknown element type */
type Coll = CC[_]
/** The default builder for `$Coll` objects.
* @tparam A the type of the ${coll}'s elements
*/
def newBuilder[A]: Builder[A, CC[A]]
/** An empty collection of type `$Coll[A]`
* @tparam A the type of the ${coll}'s elements
*/
def empty[A]: CC[A] = newBuilder[A].result
/** Creates a $coll with the specified elements.
* @tparam A the type of the ${coll}'s elements
* @param elems the elements of the created $coll
* @return a new $coll with elements `elems`
*/
def apply[A](elems: A*): CC[A] = {
val b = newBuilder[A]
b ++= elems
b.result
}
}
|