Enable compilation under C++20 with clang++ and its standard library #1248
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When using C++20 with
clang++(version 15) and also adding-stdlib=libc++to enable use of its standard library,the removal of
std::result_ofbites us and compilation fails. This was deprecated in C++17, and removed in C++20. Conditional use of the replacementstd::invoke_resultworks.Checklist
R CMD checkstill passes all tests