ftl: add comparison operators to Optional

Add comparison operators and tests for Optional

Test: build
Bug: 185536303
Change-Id: Ic2002489f5fa04cbb8b4c7aba57c8213b9719944

1 files changed, 10 insertions, 0 deletions

diff --git a/include/ftl/optional.h b/include/ftl/optional.h
index 626507fd8f..7b02bac340 100644
--- a/include/ftl/optional.h
+++ b/include/ftl/optional.h
@@ -97,6 +97,16 @@ struct Optional final : std::optional<T> {
   }
 };
 
+template <typename T, typename U>
+constexpr bool operator==(const Optional<T>& lhs, const Optional<U>& rhs) {
+  return static_cast<std::optional<T>>(lhs) == static_cast<std::optional<U>>(rhs);
+}
+
+template <typename T, typename U>
+constexpr bool operator!=(const Optional<T>& lhs, const Optional<U>& rhs) {
+  return !(lhs == rhs);
+}
+
 // Deduction guides.
 template <typename T>
 Optional(T) -> Optional<T>;