Re: [boost] Multiple inheritance & constructors problem. Boost.python

From: David Abrahams (david.abrahams_at_[hidden])
Date: 2001-11-13 23:06:43

----- Original Message -----
From: "Ivan A. Vigasin" <vig_at_[hidden]>
To: <boost_at_[hidden]>
Sent: Tuesday, November 13, 2001 7:39 PM
Subject: Re: [boost] Multiple inheritance & constructors problem.
Boost.python

> On Tue, 13 Nov 2001, David Abrahams wrote:
>
> Dave,
>
> Many thanks for your answer !
>
>
> One of solutions is to wrap each extension class with real python class.
>
> Can you offer more elegant solution?

Ivan,

I think I have your answer:

class MyClass(ExtClass, Thread):
    __Thread_init = Thread.__init__
    def __init__(self):
        ExtClass.__init__(self)
        self.__Thread_init()

From what I can see in the source code, this should work.
As in fact it does (!):

# comprehensive is an extension module
>>> class Base:
...     def __init__(self):
...             self.x = 'hello'
...
>>> class MyClass(comprehensive.A1,Base):
...     __init_Base_ = Base.__init__
...     def __init__(self):
...             comprehensive.A1.__init__(self)
...             self.__init_Base_()
>>> c = MyClass()
>>> dir(c)
['_MyClass__init_Base_', '__doc__', '__init__', '__module__', 'inheritA1',
'overrideA1', 'x']
>>> c.x
'hello'