public unowned ExpressionWatch bind (Object target, string property, Object? this_)
target's property named
property to this.
The value that this evaluates to is set via @set
target. This is repeated whenever this changes to ensure that the object's property stays
synchronized with this.
If this's evaluation fails,
property is not updated. You can ensure that
this doesn't happen by using a fallback expression.
Note that this function takes ownership of this. If you want to keep it around, you should @ref it beforehand.
the target object to bind to
name of the property on
the this argument for the evaluation of this