Tcl 9.0/Tk9.0 Documentation > Tcl Commands, version 9.0.0 > my

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NAME

SYNOPSIS

DESCRIPTION

The object upon which the method is invoked via my is the one that owns the namespace that the my command is contained in initially (NB: the link remains if the command is renamed), which is the currently invoked object by default. Similarly, the object on which the method is invoked via myclass is the object that is the current class of the object that owns the namespace that the myclass command is contained in initially. As with my, the link remains even if the command is renamed into another namespace, and defaults to being the manufacturing class of the current object.

Each object has its own my and myclass commands, contained in its instance namespace.

EXAMPLES

oo::class create c {
    method count {} {
        my variable counter
        puts [incr counter]
    }
}

c create o
o count              → prints "1"
o count              → prints "2"
o count              → prints "3"

This example shows how you can use my to make callbacks to private methods from outside the object (from a trace), using namespace code to enter the correct context. (See the callback command for the recommended way of doing this.)

oo::class create HasCallback {
    method makeCallback {} {
        return [namespace code {
            my Callback
        }]
    }

    method Callback {args} {
        puts "callback: $args"
    }
}

set o [HasCallback new]
trace add variable xyz write [$o makeCallback]
set xyz "called"     → prints "callback: xyz {} write"

This example shows how to access a private method of a class from an instance of that class. (See the classmethod declaration in oo::define for a higher level interface for doing this.)

oo::class create CountedSteps {
    self {
        variable count
        method Count {} {
            return [incr count]
        }
    }
    method advanceTwice {} {
        puts "in [self] step A: [myclass Count]"
        puts "in [self] step B: [myclass Count]"
    }
}

CountedSteps create x
CountedSteps create y
x advanceTwice       → prints "in ::x step A: 1"
                     → prints "in ::x step B: 2"
y advanceTwice       → prints "in ::y step A: 3"
                     → prints "in ::y step B: 4"
x advanceTwice       → prints "in ::x step A: 5"
                     → prints "in ::x step B: 6"
y advanceTwice       → prints "in ::y step A: 7"
                     → prints "in ::y step B: 8"

SEE ALSO

KEYWORDS