Core/Utils: Create std::optional helper class (#3994)

src/common/Utilities/Optional.h

@@ -0,0 +1,15 @@
+/*
+ * Copyright (C) 2016+     AzerothCore <www.azerothcore.org>, released under GNU GPL v2 license: https://github.com/azerothcore/azerothcore-wotlk/blob/master/LICENSE-GPL2
+ * Copyright (C) 2008-2016 TrinityCore <http://www.trinitycore.org/> 
+ */
+
+#ifndef ACORE_OPTIONAL_H
+#define ACORE_OPTIONAL_H
+
+#include <optional>
+
+//! Optional helper class to wrap optional values within.
+template <class T>
+using Optional = std::optional<T>;
+
+#endif // ACORE_OPTIONAL_H