Beefy Boxes and Bandwidth Generously Provided by pair Networks
Do you know where your variables are?
 
PerlMonks  

Re^4: More efficient dereferencing of a subroutine return

by parv (Priest)
on Feb 18, 2013 at 00:05 UTC ( #1019241=note: print w/ replies, xml ) Need Help??


in reply to Re^3: More efficient dereferencing of a subroutine return
in thread More efficient dereferencing of a subroutine return

Did you, and the one before you, missed the part where I wrote about the case of undef being returned, as in ...

use strict; my @p = @{ list() }; sub list { return undef; }

...?


Comment on Re^4: More efficient dereferencing of a subroutine return
Download Code
Re^5: More efficient dereferencing of a subroutine return
by Anonymous Monk on Feb 18, 2013 at 00:24 UTC

    That is what you said, but look at the OP's code, its always  return \@array which can never be undef

    an empty array is better than undef

      It seems you and I read the representation of the problem differently. Your reply presumes that every return from sub is always a return of an array reference. (If that promise is made to the user of the sub, then I have no disagreement with direct dereferencing of the return value.) I think of the value returned being an array reference where possible; else, nothing or undef is returned.

        Look, no temporaries, no fatal :) my @stuff = eval { @{ func() } };

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1019241]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others making s'mores by the fire in the courtyard of the Monastery: (12)
As of 2015-07-06 19:07 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









    Results (81 votes), past polls