From b0fa07975af2ed8812544950f5785a48f0b41dfd Mon Sep 17 00:00:00 2001
From: Henning Baldersheim <balder@yahoo-inc.com>
Date: Wed, 7 Oct 2020 21:03:58 +0000
Subject: mutex must be mutable to be used in const method.

---
 staging_vespalib/src/vespa/vespalib/util/varholder.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'staging_vespalib/src')

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() {}
-- 
cgit v1.2.3