Beefy Boxes and Bandwidth Generously Provided by pair Networks
go ahead... be a heretic
 
PerlMonks  

Re^4: sub that sets $_

by TheDamian (Priest)
on Jun 29, 2005 at 00:54 UTC ( #470880=note: print w/replies, xml ) Need Help??


in reply to Re^3: sub that sets $_
in thread sub that sets $_

On further investigation, it appears that you can tell the two contexts apart using the Want module. Specifically, want('BOOL') knows the difference. For example:
my $flipflop = 0; sub foo { use Want qw(want); print 'not ' if !want 'BOOL'; print "bool\n"; return $flipflop=!$flipflop; # alternate true and false } for (1..3) { while (foo() ) { # print "here 1\n"; } while ($answer = foo() ) { # print "here 2\n"; } }

Unfortunately, under 5.8.3 I get bus errors if there I uncomment the print statements, or if there is anything in the while blocks. :-(

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://470880]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others lurking in the Monastery: (6)
As of 2016-10-01 20:48 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?
    How many different varieties (color, size, etc) of socks do you have in your sock drawer?






    Results (7 votes). Check out past polls.