Beefy Boxes and Bandwidth Generously Provided by pair Networks
No such thing as a small change

Re: constant and eval (are they enemies?)

by Juerd (Abbot)
on May 22, 2002 at 19:53 UTC ( #168567=note: print w/replies, xml ) Need Help??

in reply to constant and eval (are they enemies?)

eval returns whatever the block of code returns. A block of code returns the return value of the last evaluated statement. use is a compile-time keyword, and at runtime, nothing happens in your evaled code, so it returns undef. Undef is false, so $@ is warned. But because nothing went wrong, $@ is empty, and warn warns "something's wrong".

Fix it like this:

eval "..."; warn $@ if $@;

Or like this (make it return true):

eval "...; 1;" or warn $@;
The first solution is better, imho.

- Yes, I reinvent wheels.
- Spam: Visit eurotraQ.

Log In?

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: note [id://168567]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others exploiting the Monastery: (5)
As of 2022-05-16 09:04 GMT
Find Nodes?
    Voting Booth?
    Do you prefer to work remotely?

    Results (62 votes). Check out past polls.