feat: add FlagsEnum::isEmpty for checking if a FlagsEnum is empty (#5550)

2024-08-18 12:22:41 +02:00
parent f3cae76abf
commit 66c3bc2112
3 changed files with 24 additions and 0 deletions
@@ -326,6 +326,23 @@ TEST(FlagsEnum, hasNone)
    testHasNone<BasicUnscoped>();
 }

+template <typename E>
+consteval void testIsEmpty()
+{
+    using FE = FlagsEnum<E>;
+
+    static_assert(FE{}.isEmpty());
+    static_assert(!FE{E::Foo}.isEmpty());
+    static_assert(FE{E::None}.isEmpty());
+    static_assert(!FE{E::Foo, E::Waldo}.isEmpty());
+}
+
+TEST(FlagsEnum, isEmpty)
+{
+    testIsEmpty<BasicScoped>();
+    testIsEmpty<BasicUnscoped>();
+}
+
 template <typename T>
 constexpr inline auto CONSTRUCTION_VALID = requires() { FlagsEnum<T>{}; };