class nat {nat();};
How about not_a_type?
It's a little more to type, but looks much better (IMHO).
And shouldn't it be :
struct not_a_type {};
As Peter pointed out, such a class can have several uses. In some of the contexts I've used it, I wanted to make sure that client code could not construct an instance. Perhaps such a constraint would not be appropriate in all use cases.
-Howard
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