Copy constructors

[Roman Suzi]

On Mon, 13 Aug 2001, Roman Suzi wrote:

> For example, by using __builtin__ trick:
> 
> class MyNumber(integer):
> 
>    def myadd(self, x, y):
>      return x*y
> 
>    __builtin__.add = myadd
> 
> 
> The essence of the idea is to gather builtin (C) methods into special
> namespace: __builtin__, the same way it is done with builtin fuctions.
> This will allow Python programmers to remember less details and
> will give shadowing for free!!!
> 
> The summary of proposal is to leave things as they are, but to introduce
> __builtin__ namespace for optimized methods.
> 
> (Name __builtin__ could be different)

I forgot to mention that inheritance rules for __builtin__ could 
be made explicit, if needed:


class MyNumber(no_builtins(type(1))):
   ...

or

class MyNumber(type(1)):
   ...

where no_builtins() is function on classes, making changes
to, say, __builtin__.

Or even:

class MyNumber(inline(type(1))):
  ...

Which will bring type(1).__builtin__  directly into 
MyNumber namespace, wrapping raw C-methods if necessary.

I think, this is good idea.

And also I think class definitions must allow
to use sequences, so, some filter function could be applied:

class C(filter(myrule, [A,B])):
  pass



Sincerely yours, Roman A.Suzi
-- 
 - Petrozavodsk - Karelia - Russia - mailto:rnd at onego.ru -