[IronPython] how to use Predicates in IPy?

[Count László de Almásy]

Thanks Dino, i got it working. Good thread for the archive too.

On Fri, Jul 24, 2009 at 2:24 PM, Dino Viehland<dinov at microsoft.com> wrote:
> Is this actually a List<T> or something that just happens
> to have a similar FindAll method?  It looks like List<T> only
> has a single overload so it works there.
>
> In this case you can do:
>
> Predicate[UInt32](lambda x: True)
> Or
> Predicate[Primitive](lambda x: True)
>
> To construct the delegate explicitly depending on which overload you want.
>
>> -----Original Message-----
>> From: users-bounces at lists.ironpython.com [mailto:users-
>> bounces at lists.ironpython.com] On Behalf Of Count László de Almásy
>> Sent: Friday, July 24, 2009 1:19 PM
>> To: Discussion of IronPython
>> Subject: Re: [IronPython] how to use Predicates in IPy?
>>
>> both attempts give a TypError:
>>
>> >>> sim.ObjectsPrimitives.FindAll(lambda inst:True)
>> Traceback (most recent call last):
>>   File "<stdin>", line 1, in <module>
>> TypeError: Multiple targets could match: FindAll(Predicate[UInt32]),
>> FindAll(Predicate[Primitive])
>>
>> On Fri, Jul 24, 2009 at 10:15 AM, Dino Viehland<dinov at microsoft.com>
>> wrote:
>> > You can just do:
>> >
>> > x.FindAll(lambda inst:True)
>> >
>> > or:
>> >
>> > def MyPredicate(obj):
>> >        return True
>> >
>> > x.FindAll(MyPredicate)
>> >
>> >> -----Original Message-----
>> >> From: users-bounces at lists.ironpython.com [mailto:users-
>> >> bounces at lists.ironpython.com] On Behalf Of Count László de Almásy
>> >> Sent: Friday, July 24, 2009 12:04 AM
>> >> To: Discussion of IronPython
>> >> Subject: [IronPython] how to use Predicates in IPy?
>> >>
>> >> I've been unable to find any examples of how to define/use
>> Predicates
>> >> in IPy, as for use with .NET's List(T).FindAll method. Specifically
>> >> I'm trying to use
>> >>
>> http://lib.openmetaverse.org/docs/trunk/html/M_OpenMetaverse_InternalDi
>> >> ctionary_2_FindAll_1.htm
>> >>
>> >> Anyway, if someone could help with an example of how to do such
>> things
>> >> in IPy I'd greatly appreciate. The one mention of it in this list's
>> >> archives is from 2006 and refers to an example url that is now
>> broken.
>> >>
>> >> --
>> >> Cheers, László
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>>
>>
>>
>> --
>> Cheers, László
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-- 
Cheers, László