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-rw-r--r--staging_vespalib/src/vespa/vespalib/util/varholder.h4
1 files changed, 2 insertions, 2 deletions
diff --git a/staging_vespalib/src/vespa/vespalib/util/varholder.h b/staging_vespalib/src/vespa/vespalib/util/varholder.h
index 980d773adc4..5b68ffa5582 100644
--- a/staging_vespalib/src/vespa/vespalib/util/varholder.h
+++ b/staging_vespalib/src/vespa/vespalib/util/varholder.h
@@ -9,8 +9,8 @@ namespace vespalib {
template <typename T>
class VarHolder
{
- T _v;
- std::mutex _lock;
+ T _v;
+ mutable std::mutex _lock;
public:
VarHolder() : _v(), _lock() {}
explicit VarHolder(const T &v) : _v(v), _lock() {}