[visionegg] Re: Proper use of ParameterTypes

Hi Simeon,

On Aug 15, 2005, at 5:56 AM, Simeon Fitch wrote:

I have two questions about the use of ParameterTypes with ClassWithParameters:

1) What's the role of the *MC classes? Integer vs. IntegerMC, AnyClass
vs. AnyClassMC, etc.?

They're metaclasses... I can't remember why they were/are necessary. I think it's safe for you to ignore them.

2) I have a subclass of ClassWithParameters where one of the
parameters needs to be of a specific class. I'm not sure which
ParameterTypes class I should use; AnyClass, or Instance, or SubClass.
From the reference documentation it's not clear to me how to properly
use these.

I've added some minimal docstrings: see http://visionegg.org/cgi-bin/viewcvs.cgi/trunk/visionegg/src/ ParameterTypes.py?rev=1340&view=markup

I think in most cases you'd want Instance. AnyClass or SubClass should be used if you want to use a class object as a parameter, not an instance of that class.

Cheers!
Andrew


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