Beefy Boxes and Bandwidth Generously Provided by pair Networks
Think about Loose Coupling
 
PerlMonks  

Re^2: OO-call bug uncovered & autovivified functions: defined? exists?

by Sidhekin (Priest)
on Oct 28, 2007 at 22:47 UTC ( #647756=note: print w/replies, xml ) Need Help??


in reply to Re: OO-call bug uncovered & autovivified functions: defined? exists?
in thread OO-call bug uncovered & autovivified functions: defined? exists?

I don't think it makes semantic sense for exists to be applied to functions.

Nonetheless there are semantics for it.

sub E; # exists, but not defined sub D { 1 }; # exists _and_ defined # sub N does _not_ exist $\="\n"; print exists(&N) ? "N exists" : "N doesn't exist"; print exists(&E) ? "E exists" : "E doesn't exist"; print exists(&D) ? "D exists" : "D doesn't exist"; print defined(&N) ? "N is defined" : "N is not defined"; print defined(&E) ? "E is defined" : "E is not defined"; print defined(&D) ? "D is defined" : "D is not defined"; __END__ N doesn't exist E exists D exists N is not defined E is not defined D is defined

print "Just another Perl ${\(trickster and hacker)},"
The Sidhekin proves Sidhe did it!

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://647756]
help
Chatterbox?
[james28909]: omg
[james28909]: im just finding out that july and august have 31 days?
[atcroft]: stevieb: Apparently it was contagious....
[atcroft]: james28909: Make both hands into fists, place them together (with thumbs concealed), and every knuckle is a month (starting with Jan.) has 31 days, every dip (between knuckles) does not....
[atcroft]: (And Feb. is the odd case, because it is 28, unless it is a year divisible by 4, or if it is divisible by both 100 and 400 (at which point it is 29).)
[james28909]: i know but scroll through your calendar on your computer.
[james28909]: i thiught you were going to say make both hands into a fist and puch yourself in the face
[atcroft]: .oO(Sorry, I probably should have said take two normal hands....)
[atcroft]: james28909: No, unless you are a politician, I wouldn't say that (and even if you are, I still probably wouldn't say that).
[james28909]: i mean how hard can it be? its just subtracting days lol

How do I use this? | Other CB clients
Other Users?
Others cooling their heels in the Monastery: (3)
As of 2017-04-29 04:27 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    I'm a fool:











    Results (531 votes). Check out past polls.