Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer
 
PerlMonks  

Re^2: For vs. Foreach

by JavaFan (Canon)
on Feb 13, 2009 at 18:04 UTC ( #743657=note: print w/replies, xml ) Need Help??


in reply to Re: For vs. Foreach
in thread For vs. Foreach

Peeking in toke.c suggests there is one difference between 'for' and 'foreach'. It seems it's valid to use 'for' somewhere in an attribute declaration. The documentation about attribute doesn't make it clear to me how. Best thing I can do is generating different error message when using 'for' or 'foreach':
$ perl -wE 'sub foo: foreach' Invalid CODE attribute: foreach at -e line 1 BEGIN failed--compilation aborted at -e line 1. $ perl -wE 'sub foo: for' syntax error at -e line 1, next token ??? Execution of -e aborted due to compilation errors.
Using 'for' is a compile time error, using 'foreach' a run time error (resulting in abortion of the compilation).

If someone could show how to use 'for' inside an attribute, that would be dandy.

Replies are listed 'Best First'.
Re^3: For vs. Foreach
by tilly (Archbishop) on Feb 13, 2009 at 19:49 UTC
    You're right!
    use Attribute::Handlers; sub foreach :ATTR { print "Just another Perl hacker,\n"; } sub foo :foreach {} foo();
    prints the expected, while
    use Attribute::Handlers; sub for :ATTR { print "Just another Perl hacker,\n"; } sub foo :for {} foo();
    does not. I'll follow my own advice and send a perlbug.

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://743657]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others rifling through the Monastery: (3)
As of 2021-01-26 22:03 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    Notices?