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Re: using constants to trigger debug code

by liz (Monsignor)
on Jun 04, 2004 at 20:03 UTC ( #361184=note: print w/ replies, xml ) Need Help??


in reply to using constants to trigger debug code

To further what the other monks already said.

When using constants with debugging, I'm usually using an environment variable to signal the level of debugging info required, with variations on the following code:

BEGIN { my $level = $ENV{'FOO_DEBUG'} || 0; eval "*Foo::DEBUG = sub () {$1}" if $level =~ m#^(\d+)$#s; } #BEGIN if (Foo::DEBUG) { print "We're debugging\n"; }
If this code is run with -MO=Deparse, you get:
sub BEGIN { my $level = $ENV{'FOO_DEBUG'} || 0; eval "*Foo::DEBUG = sub () {$1}" if $level =~ /^(\d+)$/s; } '???';
If you set the environment variable FOO_DEBUG to 1, you get:
sub BEGIN { my $level = $ENV{'FOO_DEBUG'} || 0; eval "*Foo::DEBUG = sub () {$1}" if $level =~ /^(\d+)$/s; } do { print "We're debugging\n" };

Hope this helps.

Liz

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Re^2: using constants to trigger debug code
by adrianh (Chancellor) on Jun 04, 2004 at 20:15 UTC

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