Graydon Hoare, a former C++ programmer on Mozilla Firefox and the original creator of Rust, acknowledges that for many people, Rust has become a viable alternative to C++ :
It's possible that Graydon's earliest private versions of Rust the 4 years prior to that pdf were an OCaml-inspired language but it's clear that once the team of C++ programmers at Mozilla started adding their influences, they wanted it to be a cleaner version of C++. That's also how the rest of the industry views it.
Alternative yes, derivative no. Rust doesn't approach C++'s metaprogramming features, and it probably shouldn't given how it seems to be used. It's slightly self-serving for browser devs to claim Rust solves all relevant problems in their domain and therefore eclipses C++, but to me in the scientific and financial space it's a better C, making tradeoffs I don't see as particularly relevant.
I say this as a past contributor to the Rust std lib.
Zig, D, and C are also alternatives to C++. It’s a class of languages that have zero cost abstractions.
Rust is NOT a beautiful language hiding inside of C++. It is not an evolution of C++. I’m pointing out that what you said is objectively wrong.
Can rust replace C++ as a programming language that has a fast performance profile due to zero cost abstractions? Yes. In the same way that Haskell can replace Python, yes it can.
https://graydon2.dreamwidth.org/307291.html
And on slide #4, he mentions that "C++ is well past expiration date" :
https://venge.net/graydon/talks/intro-talk-2.pdf
It's possible that Graydon's earliest private versions of Rust the 4 years prior to that pdf were an OCaml-inspired language but it's clear that once the team of C++ programmers at Mozilla started adding their influences, they wanted it to be a cleaner version of C++. That's also how the rest of the industry views it.