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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)
update¹) like
In reply to Re: Bless and Do
by LanX
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