Add a relative timestamp when tracing.

make it testable by allowing control of clock.

1 files changed, 3 insertions, 1 deletions

diff --git a/staging_vespalib/src/vespa/vespalib/objects/cloneable.h b/staging_vespalib/src/vespa/vespalib/objects/cloneable.h
index f6fcce0156b..c219907ae36 100644
--- a/staging_vespalib/src/vespa/vespalib/objects/cloneable.h
+++ b/staging_vespalib/src/vespa/vespalib/objects/cloneable.h
@@ -1,5 +1,7 @@
 // Copyright 2017 Yahoo Holdings. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
+
 #pragma once
+
 /**
  * @class vespalib::Cloneable
  * @brief Superclass for objects implementing clone() deep copy.
@@ -19,7 +21,7 @@ public:
      * don't need to cast it to get the correct type.
      */
     virtual Cloneable* clone() const = 0;
-    virtual ~Cloneable() {}
+    virtual ~Cloneable() = default;
 };
 
 } // namespace vespalib