Implementing the spaceship operator for optional

  • optional<T> compares to optional<U>, where valid (6 functions).
  • optional<T> compares to U, where valid (12 functions). I’m skeptical of this particular use-case, but this post is all about implementing the spec.
  • optional<T> compares to nullopt_t (12 functions). This case is trivial to implement, since several of the operations are simply constants (e.g. operator>=(optional<T>, nullopt_t) is true). But, that’s still 12 trivial-to-implement functions.
The comparison categories for the spaceship operator




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