move empty id to constexpr in header

2 files changed, 2 insertions, 2 deletions

diff --git a/metrics/src/vespa/metrics/metric.cpp b/metrics/src/vespa/metrics/metric.cpp
index 82f9c848ece..579e3bdfbe3 100644
--- a/metrics/src/vespa/metrics/metric.cpp
+++ b/metrics/src/vespa/metrics/metric.cpp
@@ -44,7 +44,7 @@ vespalib::Regexp Metric::_namePattern(namePattern);
 
 Tag::Tag(vespalib::stringref k)
     : _key(NameRepo::tagKeyId(k)),
-      _value(0)
+      _value(TagValueId::empty_handle)
 { }
 Tag::Tag(vespalib::stringref k, vespalib::stringref v)
     : _key(NameRepo::tagKeyId(k)),
diff --git a/metrics/src/vespa/metrics/metric.h b/metrics/src/vespa/metrics/metric.h
index c92cad8c0cd..d1313c3ca1a 100644
--- a/metrics/src/vespa/metrics/metric.h
+++ b/metrics/src/vespa/metrics/metric.h
@@ -94,7 +94,7 @@ struct Tag
     Tag & operator = (Tag &&) = default;
     ~Tag();
 
-    bool hasValue() const { return _value.id() != 0; }
+    bool hasValue() const { return (_value != TagValueId::empty_handle); }
 
 private:
     TagKeyId _key;