Add header guard (#6358)

ezelkow1 · web-flow · commit 0e64d36ecfea · 2020-01-27T18:33:08.000-07:00
Header guard for EnumDescriptor.h
diff --git a/include/tscore/EnumDescriptor.h b/include/tscore/EnumDescriptor.h
@@ -19,6 +19,8 @@
   limitations under the License.
 */
 
+#pragma once
+
 #include <string_view>
 #include <unordered_map>
 
