AK: Enable direct comparsion of Optional<T> and T

This patch introduces a new operator== to compare an Optional to its
contained type directly. If the Optional does not contain a value, the
comparison will always return false.

This also adds a test case for the new behavior as well as comparison
between Optional objects themselves.

1 files changed, 6 insertions, 0 deletions

diff --git a/AK/Optional.h b/AK/Optional.h
index 9a1b786da8..6b8a987006 100644
--- a/AK/Optional.h
+++ b/AK/Optional.h
@@ -100,6 +100,12 @@ public:
         return has_value() == other.has_value() && (!has_value() || value() == other.value());
     }
 
+    template<typename O>
+    ALWAYS_INLINE bool operator==(O const& other) const
+    {
+        return has_value() && value() == other;
+    }
+
     ALWAYS_INLINE ~Optional()
     {
         clear();