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PatternProgramming (last edited 2008-11-15 13:59:47 by localhost)

-  ⇤ ← Revision 2 as of 2003-11-17 22:09:57 → 
  Size: 755
  Editor: yermat
  Comment:
+   ← Revision 8 as of 2003-11-17 22:18:11 → ⇥
  Size: 102
  Editor: yermat
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 3:
-= Singleton =
+= Pattern Programming =
 Line 5:
-Voyez aussi http://c2.com/cgi/wiki?PythonSingleton
+=== GoF ===
 Line 7:
-=== classmethod ===
----
''' pro '''

You can use both as simple class or as a singleton.
You do not need to write code for each class you want to act as singleton.

----
''' cons '''
+ * SingletonProgramming
-Line 18:
+Line 10:
-{{{
#!python
# Code is Public Domain.
class Singleton:
    _singleton = None
    
    def getSingleton(cls):
        if not Singleton._singleton:
            Singleton._singleton = cls()
        return Singleton._singleton

    getSingleton = classmethod(getSingleton)


class Test(Singleton):
    def test(self):
        print self.__class__,id(self)


t1 = Test.getSingleton()
t2 = Test.getSingleton()

t1.test()
t2.test()
}}}