Hi,
as I understand it you may implement IEquatable for performance reasons (better than overriden Equals) but you don't have to. In any case you should override object.Equals AND object.GetHashCode because many collection classes (Dictionary comes to mind) will only work if GetHashCode is implemented to fit your Equals implementation (GetHashCode will be checked first - if this returns different numbers - as is likely if you have two different objects in memory - Equals will never be called and the objects will be regardes as different)
Hi,
as I understand it you may implement IEquatable for performance reasons (better than overriden Equals) but you don't have to.
Thanks! So does this mean that the default implementation of IEquatable calls the non-generic Equals method? This in turn would mean that, if I implement IEquatable, I would also have to override the non-generic Equals, right?
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When creating a type with CustomEquality, what do I need to override? I'm assuming boolean Equals(obj other), but what about the Equals method in IEquatable? ("Expert F# 2.0" mentions only the former. Visual Studio also only tells me to override the former.)
If I override one but not the other, what's the semantics of the one I don't override?