NullBinaryOperation

A generalized binary operation interface for maybe-null operands.

This is a function interface for the invoke method, which takes in maybe-null left and right operands, and outputs a result.

Construction Helper Functions

Helper functions for constructing binary operations with common patterns are available in this interface's companion object here. Unfortunately, Kotlin's documentation generator Dokka doesn't like to show companion object methods inside interfaces, but all these methods can be called just like a static method (i.e. NullBinaryOperation.combineOrNull(...)).