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8.228. UNIVERSAL
Base class;
all blessed references inherit from it:
$sub = $obj->can('print');
$yes = UNIVERSAL::isa($ref, "HASH");
Provides the following methods.
| can |
$sub = $obj->can(method)
Checks if object $objhas a method method. If so, returns a
reference to the subroutine; otherwise, returns
undef. Can be called as a static or object method
call, or as a subroutine:
$ref = UNIVERSAL::can(val, method)Returns a reference to the subroutine if
val is a blessed reference with a method
method, and undef if
val is not blessed or does not have
method.
| isa |
$io = $fd->isa(type)
Returns true if the reference is blessed into package
type or inherits from that package. Can be
called as a static or object method call, or as a subroutine:
UNIVERSAL::isa(val, type)Returns true if the first argument is a reference and either of the
following is true:
val is a blessed reference and is blessed
into package type or inherits from package
type.
val is a reference to a
type of Perl variable (e.g.,
'HASH').
| VERSION |
VERSION([require])
Returns the value of the variable $VERSION in the
package the object is blessed into. With
require specified,
VERSION dies if the version of the package is not
equal to or greater than the version specified in
require. Can be called as either a static
or object method call.
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| 8.227. Time::tm |  | 8.229. User::grent |
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