Covariance and Contravariance on the same type argument
- by William Edmondson
The C# spec states that an argument type cannot be both covariant and contravariant at the same time.
This is apparent when creating a covariant or contravariant interface you decorate your type parameters with "out" or "in" respectively. There is not option that allows both at the same time ("outin").
Is this limitation simply a language…