set_marshal

Sets the marshaller of this.

The `marshal_data` of marshal provides a way for a meta marshaller to provide additional information to the marshaller.

For GObject's C predefined marshallers (the `g_cclosure_marshal_*()` functions), what it provides is a callback function to use instead of this->callback.

See also: set_meta_marshal

Parameters:

this	a Closure
marshal	a ClosureMarshal function