Fixes issue 181. #479

Job	Run time
B2 msvc-14.2	5m 26s
B2 gcc-11	3m 37s
B2 msvc-14.3	5m 47s
CMake gcc-11 17 Debug	8m 43s
B2 clang-14	3m 48s
CMake msvc-14.2 Debug C++17	9m 4s
CMake gcc-11 20 Release	11m 13s
CMake msvc-14.2 Release C++17	7m 48s
CMake clang-11 17 Debug	6m 12s
CMake msvc-14.3 Debug C++20	10m 50s
CMake msvc-14.3 Release C++20	8m 39s
CMake clang-11 20 Debug	6m 28s
CMake clang-13 17 Release	9m 17s
CMake clang-13 20 Release	9m 23s
CMake clang-14 17 Debug -stdlib=libc++	8m 21s
CMake clang-14 20 Release -stdlib=libc++	11m 24s
	2h 6m 0s

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