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

Re: Real life uses for closures.

by davido (Archbishop)
on Feb 12, 2013 at 21:43 UTC ( #1018453=note: print w/ replies, xml ) Need Help??


in reply to Real life uses for closures.

Bytes::Random::Secure uses a closure to share the same lazily-instantiated CSPRNG across several functions while avoiding making it accessable as a package global -- for several reasons. This could be achieved through other means, such as a private accessor function with its own state variable holding onto the RNG instance. Then each of the functions that shares the same RNG would use the accessor function to obtain a reference to the RNG instance, but it would be a little less convenient to implement, and would impose a minimum Perl version requirement for no good reason, which is something I really worked hard to avoid.

This isn't a slam-dunk endorsement of closures over state variables, since a similar outcome could be acheived using state variables with a little more work. And backward compatibility probably isn't one of the "real world" reasons you are interested in taking into consideration. But in this particular case, the simplicity that closures lend, and the advantage of backward compatibility conspired to give this approach an edge over more modern techniques.


Dave


Comment on Re: Real life uses for closures.

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://1018453]
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: (4)
As of 2015-05-25 04:14 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    In my home, the TV remote control is ...









    Results (478 votes), past polls