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Typed declarations?

by LanX (Canon)
on Apr 28, 2012 at 11:39 UTC ( #967803=perlquestion: print w/ replies, xml ) Need Help??
LanX has asked for the wisdom of the Perl Monks concerning the following question:

Hi

I was asked if there are any practical consequences of typed declarations like in the following snippet

    my Gearman::Client $self = shift;

AFAI remember it's a placebo ...

(...but I thought it could be traced somehow in the Op-tree, so maybe any applications could be built on it ...)

Any insights?

Cheers Rolf

UPDATE: OK seems like from 5.10 on it's a deprecated fields feature and the syntax remains for backwards compability.

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Re: Typed declarations?
by LanX (Canon) on Apr 28, 2012 at 14:05 UTC
    Hmm at least there seems to be a compilation time check for the existance of the package:

    lanx@nc10-ubuntu:~$ perl -c -e' my blabla $x;' No such class blabla at -e line 1, near "my blabla" -e had compilation errors.

    vs.

    lanx@nc10-ubuntu:~$ perl -c -e'{package blabla;} my blabla $x;' -e syntax OK

    Cheers Rolf

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