On Mon, 2003-06-16 at 09:27, Tim Bunce wrote: > On Mon, Jun 16, 2003 at 04:31:06AM +0200, Perl Authors Upload Server wrote: > > > > Can't we use UNIVERSAL::isa()? Yes, and no. If you already have an > > object, then isa() will let you know if it inherits from a given > > class. But what do we do if we know nothing of the inheritance tree > > of the object's class? Also, if we don't have an object, just a > > normal reference, then attempting to call isa() through it will > > result in a run-time error. > > > holy() is a quick, single test to determine if a given scalar > > represents an object (i.e. a blessed reference). > > Is there a problem with this: > > $class = UNIVERSAL::isa( $foo, "UNIVERSAL") ? ref $foo : undef;
Also, there is Scalar::Util::blessed Graham. > (And the Acme:: category isn't for "typically useful" modules :) > > Tim. >
