Type constraints class and struct

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It is possible to specify whether or not the type argument should be a reference type or a value type by using the respective constraints class or struct. If these constraints are used, they must be defined before all other constraints (for example a parent type or new()) can be listed.

// TRef must be a reference type, the use of Int32, Single, etc. is invalid.
// Interfaces are valid, as they are reference types
class AcceptsRefType<TRef>
    where TRef : class
    // TStruct must be a value type.
    public void AcceptStruct<TStruct>()
        where TStruct : struct

    // If multiple constraints are used along with class/struct
    // then the class or struct constraint MUST be specified first
    public void Foo<TComparableClass>()
        where TComparableClass : class, IComparable

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