Using Macros

[Alex Martelli]

brad at SSD.CSD.HARRIS.COM (Brad Appleton) writes:
...[some details omitted]...
>use of the logical operators || and &&. Using this, the following:
>	#define CHECK(cond)  { if (cond)  exit(-1);  }
>could be replaced by
>	#define CHECK(cond)  ((cond) || exit(-1))
>And wouldnt wreak havoc inside nested if statements.

Another technique I like for this very situation:

#define CHECK(cond) if(cond) exit(-1); else

...no havoc-wrecking here, either, and also work fine for cases where
the conditional action is, say, "return FAILURE_INDICATOR;" - AND no
lint complaints about constants in conditional contexts.  Only good for
CONDITIONAL macros, alas...

-- 
Alex Martelli - CAD.LAB s.p.a., v. Stalingrado 45, Bologna, Italia
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