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----- Original Message ----- From: "Ralph Hempel"

Hopefully your compiler won't optimize that out, and it's not
actually atomic in the sense that it's thread safe :-)

Does the more verbose but clear (i ? true : false) generate better
or worse code in terms of speed or size?


No compiler should optimize that out for the very reason that it serves a purpose. It should be faster then the ? : case, as few compilers will output branching code for !! where as many for the ? : case. Still simpler to read, and already present in the Lua core is:

(i != 0) // casts i to a 1 or a 0

Which would likely produce code equal to or better than the other two methods on all compilers.

- Alex