NAME

oo::object -
root class of the class hierarchy

SYNOPSIS

package require TclOO

oo::object method ?arg ...?

CLASS HIERARCHY

oo::object

DESCRIPTION

The oo::object class is the root class of the object hierarchy; every object (and hence every class) is an instance of this class. Objects are always referred to by their name, and may be renamed while maintaining their identity. Each object has a unique namespace associated with it. Instances of objects may be made with either the create or new methods of the oo::object object itself, or by invoking those methods on any of the subclass objects; see oo::class for more details.

CONSTRUCTOR

The oo::object class does not define an explicit constructor.

DESTRUCTOR

The oo::object class does not define an explicit destructor.

EXPORTED METHODS

The oo::object class supports the following exported methods:

obj destroy

This method destroys the object, obj, that it is invoked upon, invoking any destructors on the object's class in the process. It is equivalent to using rename to delete the object command. The result of this method is always the empty string.

NON-EXPORTED METHODS

The oo::object class supports the following non-exported methods:

obj eval ?arg ...?

This method concatenates the arguments, arg, as if with concat, and then evaluates the resulting script in the namespace that is uniquely associated with obj, returning the result of the evaluation.

obj unknown methodName ?arg ...?

This method is called when an attempt to invoke the method methodName on object obj fails. The arguments that the user supplied to the method are given as arg argments. The default implementation (i.e. the one defined by the oo::object class) generates a suitable error, detailing what methods the object supports given whether the object was invoked by its public name or through the my command.

obj variable ?varName ...?

This method arranges for each variable called varName to be linked from the object obj's unique namespace into the caller's context. Thus, if it is invoked from inside a procedure then the namespace variable in the object is linked to the local variable in the procedure. Each varName argument must not have any namespace separators in it. The result is the empty string.

obj varname varName

This method returns the globally qualified name of the variable varName in the unique namespace for the object obj.

EXAMPLES

This example demonstrates basic use of an object.

set obj [oo::object new]
$obj foo             -> error "unknown method foo"
oo::objdefine $obj method foo {} {
    my variable count
    puts "bar[incr count]"
}
$obj foo             -> prints "bar1"
$obj foo             -> prints "bar2"
$obj variable count  -> error "unknown method variable"
$obj destroy
$obj foo             -> error "unknown command obj"

SEE ALSO

my(n), oo::class(n)

KEYWORDS

base class, class, object, root class