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Re: ref to read-only alias ... why?

by LanX (Canon)
on Jan 05, 2012 at 23:27 UTC ( #946494=note: print w/ replies, xml ) Need Help??

in reply to ref to read-only alias ... why?

Interesting ...

It appears like read-only values are not modified when aliased.

DB<123> sub tst { my $r = \ $_[0]; print ++$$r; } DB<124> $x=3; for (1,2,$x) { tst($_); print ": ",$_,"\n" } 2: 1 3: 2 4: 4


Seems to me like "aliasing" read-only values is falling back to "copying".

Or in other words: Only lvalues can be "really" aliased.

Which makes sense in a way, because the original value can't be changed anyway.

Cheers Rolf

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