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Postings from November 2003
Having been bitten today by the fact that I can't call an INIT block
by name (which is not documented as far as I know), I decided to take
the bull by the horns and write some corrections and additional text
in perlmod.pod and perlsub.pod.
The most important thing about this patch, is that it introduces (I
think) the term "named CODE blocks)" instead of "special subroutines"
or "special functions". I also differentiated BEGIN, CHECK, INIT and
END from the "other" all uppercase subroutines, as these are special.
I also added "PerlIO::via" as an extra reference to all uppercase subroutines.
The explanations reflect my current understanding of the matter. I
hope they are correct.
A special section may need to be added later, to show that only
BEGIN, CHECK, INIT and END don't need the "sub" prefix, and the other
all uppercase subroutines _do_ need it (even if they don't generate
any errors during compilation).
.
$ perl -MO=Deparse -e 'BEGIN { foo => "bar" }'
sub BEGIN {
'foo', 'bar';
}
-e syntax OK
$ perl -MO=Deparse -e 'CLONE { foo => "bar" }'
do {
'foo', 'bar'
}->CLONE;
-e syntax OK
Liz
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