Difference between Covariance & Contra-variance

Posted by jane doe on Stack Overflow See other posts from Stack Overflow or by jane doe
Published on 2010-02-02T14:07:33Z Indexed on 2010/03/31 21:43 UTC
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c#4.0

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covariance

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c#

I am having trouble understanding the difference between covariance and contravariance.

My understanding is one supports out, as in "action" with no return type, which is casting to. The other takes in an argument and is casting from, is this correct?

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Difference between Covariance & Contra-variance - Developer IT

Difference between Covariance & Contra-variance

c#4.0

covariance

contravariance

c#

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