Re: Macro redefinition

Keith Thompson wrote:
Tor Rustad <tor_rustad@xxxxxxxxxxx> writes:
Dave Hansen wrote:

<snip>

My question is simply, is the above C code allowed?
It's a pretty common idiom in the code I work with. One caveat:
don't
forget to #undef EXPAND_DEF before redefining it.
Is really the #undef needed in this case? This is a function-like
macro, and the re-definition had identical argument list.

C99 6.10.3p2:

An identifier currently defined as an object-like macro shall not
be redefined by another #define preprocessing directive unless the
second definition is an object-like macro definition and the two
replacement lists are identical. Likewise, an identifier currently
defined as a function-like macro shall not be redefined by another
#define preprocessing directive unless the second definition is a
function-like macro definition that has the same number and
spelling of parameters, and the two replacement lists are
identical.

This is a constraint.

Keith, I don't get your point. Doesn't the

"unless the second definition is a function-like macro definition that has the same number and spelling of parameters, and the two replacement lists are identical"

apply?

--
Tor <torust [at] online [dot] no>
.

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