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re: Existentially quantified types in C# - Part 2 VIEW POST

FULL DISCUSSION
 

Polymorphic in that each item in list can be of any type right? Not polymorphic in that each list item can have multiple types or can it?

 

A list "carton" is a lot like an IList<T>. Each carton contains only one type of item. You can create a carton of ints or a carton of strings, and you can ensure that ints and strings aren’t mixed together in a single carton.

The important difference between an IList<T> and an IListCarton is that a carton of ints and a carton of strings have exactly the same type (IListCarton), but IList<int> isn't the same type as IList<string>.

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