Fixes issue 181. #477

Job	Run time
B2 gcc-11	3m 23s
B2 clang-14	3m 48s
B2 msvc-14.2	5m 54s
CMake gcc-11 17 Debug	8m 34s
CMake gcc-11 20 Release	11m 3s
CMake clang-11 17 Debug	6m 22s
B2 msvc-14.3	5m 33s
CMake clang-11 20 Debug	6m 46s
CMake msvc-14.2 Debug C++17	8m 34s
CMake clang-13 17 Release	9m 4s
CMake msvc-14.2 Release C++17	9m 46s
CMake clang-13 20 Release	9m 50s
CMake msvc-14.3 Debug C++20	10m 8s
CMake clang-14 17 Debug -stdlib=libc++	8m 45s
CMake msvc-14.3 Release C++20	8m 30s
CMake clang-14 20 Release -stdlib=libc++	11m 17s
	2h 7m 17s

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