Type

TSampleClass <T: class> = class TSampleRec <T: record> = class TCompClass <T: TButton> = class TInftClass <T: IGetValue> = class TConstrClass <T: constructor> = class

77 Even if a direct call to TParamConst.Create will fail at compile time (as explained here), a similar call using a class reference or any other form of indirection will succeed, which probably explains the behavior of the effect of the constructor constraint.

What you might not immediately realize after looking at constraints (and this certainly took me some time to get used to) is that you can combine them. For example, you can define a generic class limited to a sub-hierarchy and requiring also a given interface, like in:

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