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Re^4: on the fly reference to subroutine output

by thirdm (Sexton)
on Mar 05, 2013 at 05:28 UTC ( #1021755=note: print w/replies, xml ) Need Help??

in reply to Re^3: on the fly reference to subroutine output
in thread on the fly reference to subroutine output

Ah, I'm always forgetting this.

But underneath, is there a chance at some kind of return value optimization? Say if you have...

sub1 { ... return @a; } $r = [sub1];
Even if it's officially turning the values of @a into a list en route to copying them into the array that the brackets create a reference to, could perl not notice @a is no longer needed otherwise and instead simply make [sub1] be \@a behind the scenes? It would be neat if you could write sub1 that way instead of making it return \@a even if you anticipated the copy to be expensive.

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