Yup, thanks for the explanation - I missed that on first reading. It seems like an incredibly bad idea though - it makes me think of all of the subtle gotchas

Yup, thanks for the explanation - I missed that on first reading. It seems like an incredibly bad idea though - it makes me think of all of the subtle gotchas involved in using macros in C, where expansion can get very weird when you put an expression in the place of a variable.