On 15/04/2011 13:48, shawn wilson wrote:
but, sense it is jumping to a different place in the stack, isn't it
more efficient than doing the above mentioned
my $done = 0;
while( !$done ){
$done = 1 if( contition );
do_work;
}
vs
for(;;) {
goto DONE if( contition );
do_work;
}
label DONE;
i'd think the later would be faster not only because you are jumping
to a memory location and because you're not assessing a value every
time.
Hi Shawn. I'm not sure what code your comparing to, but there is no
stack involved here at all. The second example would be quicker, simply
because you are testing the condition directly instead of transferring
the state to the variable $done and then testing the variable.
By the way, the loops are not equivalent, as the first executes do_work
at least one, while the second may drop out immediately without doing
anything at all.
It would be better written:
until (condition) {
do_work;
}
Rob
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