Kevin P. Fleming wrote:
Matthew Woehlke wrote:...but this ("typeof(&((b)[0]))") seems like it might work, assuming that "b" is a string literal, a [const] char*, or a [const] char[].Yes, in fact, this does seem to work: #define S_OR(a, b) ({typeof(&((a)[0])) __x = (a); ast_strlen_zero(__x) ? (b) : __x;})
Ah, simplification ;-).
This macro appears to work fine, compiles in all our existing usage situations (combinations of char *, char [], const vs. non-const) and provides the side-effect-safe evaluation of its arguments I was looking for in the first place. Thanks!
You're welcome! (Now, if only I knew why that odd incantation is needed... :-) )
-- Matthew Please do not quote my e-mail address unobfuscated in message bodies. -- When in doubt, give it a good swift kick.
