Constraints on Formal Type Parameters

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Object-oriented Programming in C#
Generic Types and Methods

Constraints on Formal Type Parameters

It is possible to express a number of constraints on a formal type parameter

The more constraints on T, the more we can do on T-objects in the body of C<T>

class C<S,T>: D  
    where T: A, ICloneable
    where S: B {
 ...
}

class E<T>: D
    where T: class{
 ...
}

class F<T>: D
    where T: struct{
 ...
}

class G<T>: D
    where T: new(){
 ...
}

Illustrations of the various constraints on type parameters.