Making TemporaryCallback stricter, but still possible to construct as a value, which should be banned for safety.

Author: Dawoodoz

Source/DFPSR/base/TemporaryCallback.h

@@ -70,6 +70,9 @@ class TemporaryCallback<RESULT(ARGS...)> {
 			return (*(F*)closure)(std::forward<ARGS>(args)...);
 		};
 	}
+	
+	// No default constructor.
+	TemporaryCallback() = delete;
 	// No copy construction, only pass it by reference from input arguments.
 	TemporaryCallback(const TemporaryCallback &other) = delete;
 	// No move construction, only pass it by reference from input arguments.