On Sun, Dec 10, 2000 at 07:26:38PM -0800, Bill Moseley wrote:
> Just how smart is the compiler?
[snip]
> use constant DEBUG_TEMPLATE => 1;
> use constant DEBUG_SESSION => 2;
> use constant DEBUG_REQUEST => 4;
> use constant DEBUG_QUERY => 8;
> use constant DEBUG_QUERY_PARSED => 16;
>
> my $debug = DEBUG_REQUEST|DEBUG_QUERY;
>
> warn "query = '$query'\n" if $debug & DEBUG_QUERY;
Not quite that smart. It has no idea if `$debug' will have changed by
the time you're asking about it. However, if you make `$debug' into a
constant, it will work (where "work" is defined as "optimize out the
conditional").
use constant FOO => 1;
use constant BAR => 2;
use constant FOOBAR => FOO|BAR;
warn "baz" if FOOBAR & FOO;
> use constant DEBUG_TEMPLATE => 0; # OFF
> use constant DEBUG_SESSION => 1; # ON
> use constant DEBUG_REQUEST => 0;
> use constant DEBUG_QUERY => 1; # ON
> use constant DEBUG_QUERY_PARSED => 0;
>
> warn $query if DEBUG_QUERY || DEBUG_QUERY_PARSED;
This will also work, but I like the first approach better. It allows you
to factor out the component you want to debug.
-dlc
