Add #pragma once

kzhdev · kzhdev · commit 3fa6d170ac2b · 2021-03-05T23:18:27.000-05:00
diff --git a/include/slick_queue.h b/include/slick_queue.h
@@ -9,6 +9,8 @@
  *
  ********************************************************************************/
 
+#pragma once
+
 #include <cstdint>
 #include <atomic>
 #include <stdexcept>
