Messages in this thread | | | Date | Thu, 14 Jan 1999 10:24:48 +0000 | From | Jamie Lokier <> | Subject | Re: useful exercise |
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On Thu, Jan 14, 1999 at 12:51:25AM +0000, Ben Hutchings wrote: > On Sun, 10 Jan 1999, Jamie Lokier wrote: > <snip> > > 3. The "always defined" form is more flexible, because you have > > the option of using `#if X', `if (X)' or even using X in an > > expression, e.g. `X ? a : b', `X && blah_blah'. > <snip> > > The C pre-processor has a defined() operator that gives you exactly > the same flexibility with the possibly-defined form.
Wrong. defined() only works following #if. You cannot use it to test for symbols in a C expression.
-- Jamie
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