IMPORTANT: Use the symbols of `src/cpp-common/bt2s/string-view.hpp`,
under the `bt2s` namespace, instead of using this directly.
+`wise_enum`::
+ https://github.com/quicknir/wise_enum[wise_enum].
+
=== Automake/Libtool requirements
To add a {cpp} source file to a part of the project, use the `.cpp`