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Re: Bless and Do

by LanX (Chancellor)
on Jun 17, 2014 at 16:08 UTC ( #1090164=note: print w/replies, xml ) Need Help??

in reply to Bless and Do

One can bless only references, but all kind of references!

While the "standard" is to bless hash-refs, there are occasions where blessing array-refs or code-refs or even scalar-refs make much sense.

BUT there is no "literal notation" for scalar-refs (like [...] or sub{...} )!

That's why a do construct is used, to avoid temporary variables¹.

IIRC does TheDamian talk about this in his (recommended!) PBP book.

HTH! :)

Cheers Rolf

(addicted to the Perl Programming Language)


¹) like

$temp_scalar = 5; my $scalar_ref = \$temp_scalar; bless $scalar_ref, ...

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