Path: csiph.com!fu-berlin.de!uni-berlin.de!not-for-mail
From: "Sven R. Kunze" <srkunze@mail.de>
Newsgroups: comp.lang.python
Subject: Re: Efficient Wrappers for Instance Methods
Date: Thu, 4 Feb 2016 21:14:27 +0100
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On 04.02.2016 19:35, Random832 wrote:
> On Thu, Feb 4, 2016, at 11:18, Sven R. Kunze wrote:
>> On 04.02.2016 00:47, Random832 wrote:
>>> On Wed, Feb 3, 2016, at 16:43, Sven R. Kunze wrote:
>>>> Actually a nice idea if there were no overhead of creating methods for
>>>> all heap instances separately. I'll keep that in mind. :)
>>> What about changing the class of the object to one which is inherited
>>> from its original class and has the method you want? What about reaching
>>> into the class and changing the method in the first place? Either may
>>> not be appropriate, of course, depending on your use case.
>> There is no base class.
> I meant something like...
>
> Class C:
>      replace = heapreplace
>
> Cs = {}
>
> ...
>
> if not isinstance(x, C)
>      T = type(x)
>      cls = cache.get(T)
>      if cls is None:
>         cls = type('C_'+T.__name__, (C, T), {})
>      x.__class__ = cls
>
> (Of course, by dynamically reassigning __class__ and using the type
> constructor, this checks two of the three "crazy type system voodoo"
> boxes. I have no idea if it will work, or if I've made a mistake, or if
> you'll be able to understand it in six months.)

I think I agree with you that this might be a maintenance nightmare. ;)

Best,
Sven