How to create functors?

Rami Chowdhury rami.chowdhury at gmail.com
Thu Aug 20 09:34:38 CEST 2009


> As near as I can tell, a functor is just an object which is
> callable like a function


I believe that's how they're defined in the C++ world, in which, of  
course, functions aren't first-class objects...

-------------
Rami Chowdhury
"Never assume malice when stupidity will suffice." -- Hanlon's Razor
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On Aug 19, 2009, at 21:11 , Steven D'Aprano wrote:

> On Wed, 19 Aug 2009 18:42:32 -0700, Paul Rubin wrote:
>
>> Robert Dailey <rcdailey at gmail.com> writes:
>>> I want to simply wrap a function up into an object so it can be  
>>> called
>>> with no parameters.
>>
>> Nitpick: what you are asking for is called a closure.  "Functor"  
>> means
>> something completely different.
>
>
> I'm glad somebody else noticed this. I would have said something  
> about it
> myself, except I wasn't entirely sure my understanding of functor is
> correct. As near as I can tell, a functor is just an object which is
> callable like a function without actually being implemented as a
> function, e.g.:
>
> class Functor:
>     def __call__(self):
>         return None
>
> f = Functor()
> result = f()
>
>
>
> -- 
> Steven
> -- 
> http://mail.python.org/mailman/listinfo/python-list




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