[jpc0]

There are patterns diffused in this paper that are modern C++ only in the sense that anything post C++11 is modern C++. That was 14 years ago, you will be hard pressed to find a toolchain that doesn’t support C++17 at this point, yes there is probably some unfortunate person building for debian old-stable or some ancient but still supported redhat but at that point you know you aren’t following modern practices and you have your reasons.

[pjmlp]

I will also debate that plenty of "modern" C++ features that people attribute to C++11, were already possible throughout C++ARM to C++03, but apparently many either weren't paying attention, or only renaming their C files into .cpp/.cxx/.C.

Just like the low level stuff done by MFC, and how much more ergonomic CSet++, OWL and VCL happened to be.