OptionalTextPositionBinaryFunction
class OptionalTextPositionBinaryFunction<A, OA : ObservableValue<A>, B, OB : ObservableValue<B>>(argA: OA, argB: OB, lambda: (A, B) -> TextPosition?) : BinaryFunction<TextPosition?, A, OA, B, OB> , ObservableOptionalTextPosition
Boilerplate which avoids having to use generics.
Similar to TextPositionBinaryFunction, but the value can also be null.