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Re:C++ Core Coroutines Proposal [pdf] by bayindirh on Friday September 21, 2018 @07:22AM (#18038853)
It's already written, but things require absolute efficiency and high performance, like HPC and ML cannot be done without C++.

I develop some HPC code, and most of them is infeasible without C++.

Other languages' high performance libraries PIL and numPy is written with C & C++.

Re:C++ Core Coroutines Proposal [pdf] by pjmlp on Friday September 21, 2018 @07:52AM (#18038992)
NVidia GPUs are now designed explicitly for running C++ code efficiently.

CppCon 2017: Olivier Giroux "Designing (New) C++ Hardware”

https://www.youtube.com/watch?v=86seb-iZCnI

Assuming another systems language, e.g. Rust, does indeed replace C++'s use cases, it is still a very long path until it gets this adoption level from hardware vendors.