I've always heard this called "short-circuit" boolean evaluation.
It was present in C (and Turbo Pascal), and basically allows conditions
such as:
char *p = somefunc(); /* returns pointer or NULL */
if (p && p->foo) /* short-circuit will fall through if p is NULL
before dereferencing p */
Without short-circuiting, this would have to be rewritten
if (p)
if (p->foo)
to avoid possible SIGSEGV.
As Henry Spencer's 2nd Commandment for C programmers clearly advises:
"Thou shalt not follow the NULL pointer, for chaos and madness await thee
at its end."
-blair
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