fix missing 'this' #1026

Job	Run time
cpp-lib-build (macos-11, clang, ON)	8m 42s
cpp-lib-build (macos-11, clang, OFF)	8m 6s
build (macos-11, tool)	2m 41s
cpp-lib-build (macos-11, gcc, ON)	7m 52s
cpp-lib-build (macos-11, gcc, OFF)	8m 29s
build (macos-11, cpp)	10m 12s
build (macos-11, csharp)	11m 11s
cpp-lib-build (ubuntu-20.04, clang, ON)	3m 10s
build (macos-11, dart)	6m 2s
cpp-lib-build (ubuntu-20.04, clang, OFF)	3m 32s
build (macos-11, go)	4m 44s
cpp-lib-build (ubuntu-20.04, gcc, ON)	2m 59s
build (macos-11, java)	2m 14s
cpp-lib-build (ubuntu-20.04, gcc, OFF)	3m 35s
build (macos-11, javascript)	3m 22s
cpp-lib-build (windows-2022, clang, ON)	4m 54s
cpp-lib-build (windows-2022, clang, OFF)	5m 53s
build (macos-11, typescript)	18m 55s
cpp-lib-build (windows-2022, cl)	4m 15s
build (macos-11, php)	27s
build (macos-11, python3)	1m 58s
build (ubuntu-20.04, tool)	55s
build (ubuntu-20.04, cpp)	17m 35s
build (ubuntu-20.04, csharp)	5m 1s
build (ubuntu-20.04, dart)	3m 31s
build (ubuntu-20.04, go)	2m 16s
build (ubuntu-20.04, java)	1m 17s
build (ubuntu-20.04, javascript)	1m 34s
build (ubuntu-20.04, typescript)	10m 10s
build (ubuntu-20.04, php)	1m 33s
build (ubuntu-20.04, python3)	1m 2s
build (windows-2022, tool)	1m 27s
build (windows-2022, cpp)	21m 25s
build (windows-2022, csharp)	6m 35s
build (windows-2022, dart)	4m 15s
build (windows-2022, go)	8m 18s
build (windows-2022, java)	1m 52s
build (windows-2022, javascript)	2m 19s
build (windows-2022, typescript)	21m 27s
build (windows-2022, php)	2m 8s
build (windows-2022, python3)	1m 31s
	3h 59m 24s

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