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Re^3: How to call a sub-routine ref

by roboticus (Canon)
on Oct 19, 2012 at 20:30 UTC ( #1000037=note: print w/ replies, xml ) Need Help??


in reply to Re^2: How to call a sub-routine ref
in thread How to call a sub-routine ref

greengaroo:

Odd, I find your examples a good case for using the second one. Again, different people will find different things more clear.

When I use hashes, I generally use $$h{foo} in preference to $h->{foo}, primarily because it's easier to type, and I use hashes quite a bit. If I were trying to make it visually distinctive, I'd make the harder to type one be for the less frequently used case. Thus, I'd use something like:

$$hashref{key}->('arg');

To my eye, that stands out better. (But with my luck, it would blow up, so I'd better whip up a test...)

$ cat t.pl use strict; use warnings; sub p { print "foo(", join(", ", @_), ")\n"; } my $hr = { key=>\&p }; $$hr{key}->('arg'); $ perl t.pl foo(arg)

...roboticus

When your only tool is a hammer, all problems look like your thumb.


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Re^4: How to call a sub-routine ref
by BillKSmith (Hermit) on Oct 20, 2012 at 04:00 UTC
    I like the second rule in perlref.
    Anywhere you'd put an identifier (or chain of identifiers) as part of a variable or subroutine name, you can replace the identifier with a BLOCK returning a reference of the correct type.

    Sure, the result is often ugly, but there are no exceptions or special cases. What more could my poor memory want.

    Bill

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