Merge pull request #503 from m-a-d-n-e-s-s/pr-tree-operations #1477

Job	Run time
macos-latest: clang++ Release Threads	18m 17s
macos-latest: clang++ Release OneTBB	4m 1s
macos-latest: clang++ Release PaRSEC	3m 17s
ubuntu-20.04: /usr/bin/g++-9 Release Threads	47m 6s
ubuntu-20.04: /usr/bin/g++-9 Release OneTBB	2m 27s
ubuntu-20.04: /usr/bin/g++-9 Release PaRSEC	3m 34s
macos-latest: clang++ Debug Threads	32m 22s
macos-latest: clang++ Debug OneTBB	2m 25s
macos-latest: clang++ Debug PaRSEC	4m 22s
ubuntu-20.04: /usr/bin/g++-9 Debug Threads	55m 54s
ubuntu-20.04: /usr/bin/g++-9 Debug OneTBB	3m 7s
ubuntu-20.04: /usr/bin/g++-9 Debug PaRSEC	2m 43s
	2h 59m 35s

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