Interesting article on programming languages

[Sami Hangaslammi]

Roey Katz <katz at glue.umd.edu> wrote in message
news:388f88ca.1925884 at news.erols.com...
> The 'virtual classes' that Sweeney describes look to me an awful lot
> like something like this:
>
>
> class myClass:
>     def __init__( self ): pass
>     def doSomething( self ): print 'instantiating'
>
> class myClass2:
>     def __init__( self ): pass
>     def doSomething( self ): print 'instantiating (2)'
>
> class Base:
>
>     virtualClass = None
>
>     def __init__( self ):
>          self.inst = self.virtualClass()
>          self.inst.doSomething()
>
>
> class Derived1( Base ):
>     virtualClass = myClass
>
> class Derived2( Base ):
>     virtualClass = myClass2

I was thinking about something along these lines:

class SomeFramework:
    class Class1:
        def some_method(self):
            print "original class1"
    class Class2:
        pass
    def __init__(self):
        self.c1 = self.Class1()
        self.c2 = self.Class2()

class DerivedFramework (SomeFramework):
    class Class1 (SomeFramework.Class1):
        def some_method(self):
            print "derived class1"

Now DerivedFramework can inherit SomeFramework and modify Class1 how
ever it wants.

--
Sami Hangaslammi
shang (at) st (dot) jyu (dot) fi

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