Beefy Boxes and Bandwidth Generously Provided by pair Networks
Your skill will accomplish
what the force of many cannot
 
PerlMonks  

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

by LanX (Chancellor)
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

UPDATE:

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

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://946494]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others avoiding work at the Monastery: (7)
As of 2016-06-26 02:17 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    My preferred method of making French fries (chips) is in a ...











    Results (327 votes). Check out past polls.