Both C++ and Rust are rather complex. But in Rust the negative effects of the complexity are mostly contained by the compiler (i.e. if you get it wrong you get

Both C++ and Rust are rather complex. But in Rust the negative effects of the complexity are mostly contained by the compiler (i.e. if you get it wrong you get a compiler error). In C++ it on the other side can easily lead to UB and in turn to potential security vulnerabilities. So IMHO today there are _very_ few cases where C++ is still the appropriate choice. Just to be clear I'm not saying rust did replace C++, but there is a wide variety of languages which are a better choice for many use-cases which once where filled by C++. Rust just further reduces use-cases where I would say C++ is appropriate. But it's anyway not Doomed as there are just way to many existing projects. Not just legacy projects, but existing still maintained for many years projects.