fix missing 'this' #1028

Job	Run time
cpp-lib-build (macos-11, clang, ON)	7m 51s
cpp-lib-build (macos-11, clang, OFF)	7m 43s
build (macos-11, tool)	2m 53s
cpp-lib-build (macos-11, gcc, ON)	7m 43s
build (macos-11, cpp)	37m 10s
cpp-lib-build (macos-11, gcc, OFF)	8m 38s
build (macos-11, csharp)	11m 22s
cpp-lib-build (ubuntu-20.04, clang, ON)	3m 11s
build (macos-11, dart)	6m 32s
cpp-lib-build (ubuntu-20.04, clang, OFF)	3m 17s
build (macos-11, go)	4m 55s
cpp-lib-build (ubuntu-20.04, gcc, ON)	3m 12s
build (macos-11, java)	3m 42s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	3m 20s
build (macos-11, javascript)	2m 33s
cpp-lib-build (windows-2022, clang, ON)	4m 47s
build (macos-11, typescript)	19m 7s
cpp-lib-build (windows-2022, clang, OFF)	5m 37s
build (macos-11, php)	22s
cpp-lib-build (windows-2022, cl)	4m 26s
build (macos-11, python3)	2m 0s
build (ubuntu-20.04, tool)	1m 11s
build (ubuntu-20.04, cpp)	17m 23s
build (ubuntu-20.04, csharp)	5m 10s
build (ubuntu-20.04, dart)	3m 40s
build (ubuntu-20.04, go)	2m 18s
build (ubuntu-20.04, java)	1m 8s
build (ubuntu-20.04, javascript)	1m 52s
build (ubuntu-20.04, typescript)	16m 21s
build (ubuntu-20.04, php)	1m 22s
build (ubuntu-20.04, python3)	1m 9s
build (windows-2022, tool)	1m 50s
build (windows-2022, cpp)	21m 22s
build (windows-2022, csharp)	6m 36s
build (windows-2022, dart)	4m 55s
build (windows-2022, go)	5m 42s
build (windows-2022, java)	2m 19s
build (windows-2022, javascript)	2m 18s
build (windows-2022, typescript)	19m 30s
build (windows-2022, php)	1m 58s
build (windows-2022, python3)	1m 39s
	4h 30m 4s

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