blob: 9bc195dce6558b5263433546b66941d5d6e73174 (
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
51
52
53
54
55
56
57
|
/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2007, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala
import collection.jcl.WeakHashMap
private[scala] object internedSymbols extends WeakHashMap[String, Symbol]
/** <p>
* Instances of <code>Symbol</code> can be created easily with
* Scala's built-in quote mechanism.
* </p>
* <p>
* For instance, the <a href="http://scala-lang.org/" target="_top">Scala</a>
* term <code>'mysym</code> will invoke the constructor of the
* <code>Symbol</code> class in the following way:
* <code>new Symbol("mysym")</code>.
* </p>
*
* @author Martin Odersky
* @version 1.7, 08/12/2003
*/
final case class Symbol(name: String) {
/** Converts this symbol to a string.
*/
override def toString(): String = {
"'" + name
}
/** <p>
* Makes this symbol into a unique reference.
* </p>
* <p>
* If two interened symbols are equal (i.e. they have the same name)
* then they must be identical (wrt reference equality).
* </p>
*
* @return the unique reference to this symbol.
*/
def intern: Symbol = internedSymbols get name match {
case Some(sym) =>
sym
case None =>
internedSymbols(name) = this
this
}
}
|