alt Hacker NewsParent talks about new languages, as per the article Fortran or C doing fine. I speculate the benefit of C++ over Rust how it let programmers instruct the compiler of warranty that goes beyong the initial semantic of the language. See __restrict, __builtin_prefetch and __builtin_assume_aligned. The programming language is a space for conversations between compiler builders and hardware designers.
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I believe __restrict, and __builtin_prefetch/__builtin_assume are compiler extensions, not part of the C++ language as is, and different compilers implement (or don't) these differently.
The rust compiler actually has similar things, but they're not available in stable builds. I suppose there are some issues if principle why not to include them in stable. E.g: https://doc.rust-lang.org/std/intrinsics/fn.prefetch_read_da...
Maybe some time in the future good acceptable abstractions will be conceived for them.. Perhaps using just using nightly builds for HPC is not that far out, though.
It is just super unpleasant to write low level software in rust.
There is a colossal ergonomics difference if you compare using clang vs rust to writing a hashmap for example.
C compilers just have everything you can think of because everythin is first implemented there.
Using anything else just seems kind of pointless. I understand new languages do have benefits but I don't believe language matters that much really.
The person who writes that garbage pointer soup in C write Arc<> + multi threaded + macro garbage soup in Rust.