Merge branch 'clang_warning_fix' into 'master'

Fixed clang warning

See merge request !169
28 jobs from master in 112 minutes and 24 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Test
passed #50039
Linux
Doc-publish

00:00:30

passed #50033
VS2013
VS2013-32-bit-shared-apps

00:05:45

passed #50034
VS2013
VS2013-32-bit-shared-no-apps

00:05:04

passed #50037
VS2013
VS2013-32-bit-static-apps

00:05:41

passed #50038
VS2013
VS2013-32-bit-static-no-apps

00:05:14

passed #50031
VS2013
VS2013-64-bit-shared-apps

00:06:21

passed #50032
VS2013
VS2013-64-bit-shared-no-apps

00:05:39

passed #50035
VS2013
VS2013-64-bit-static-apps

00:07:00

passed #50036
VS2013
VS2013-64-bit-static-no-apps

00:05:26

passed #50025
VS2015
VS2015-32-bit-shared-apps

00:08:04

passed #50026
VS2015
VS2015-32-bit-shared-no-apps

00:06:04

passed #50029
VS2015
VS2015-32-bit-static-apps

00:07:03

passed #50030
VS2015
VS2015-32-bit-static-no-apps

00:06:56

passed #50023
VS2015
VS2015-64-bit-shared-apps

00:09:37

passed #50024
VS2015
VS2015-64-bit-shared-no-apps

00:07:18

passed #50027
VS2015
VS2015-64-bit-static-apps

00:09:34

passed #50028
VS2015
VS2015-64-bit-static-no-apps

00:07:31

passed #50020
VS2017
VS2017-32-bit-shared-no-apps

00:07:19

passed #50022
VS2017
VS2017-32-bit-static-no-apps

00:06:39

passed #50019
VS2017
VS2017-64-bit-shared-no-apps

00:08:31

passed #50021
VS2017
VS2017-64-bit-static-no-apps

00:07:55

passed #50013
Linux
clang-c++11

00:27:12

passed #50015
Linux
clang-c++14

00:27:23

passed #50018
Linux
cppcheck

00:00:04

passed #50012
Linux
gcc-c++11

00:03:51

passed #50014
Linux
gcc-c++14

00:04:04

passed #50016
Apple
macos-c++11

00:10:47

passed #50017
Apple
macos-c++98

00:20:44