News for hackers. Stuff that matters.

A comment on Const vs. constexpr vs. consteval vs. constinit in C++20. Parent comment

Re:Const vs. constexpr vs. consteval vs. constinit in C++20 by chlorion on Monday November 28, 2022 @09:35PM (#33782995)
There are still some things that C++ can do that Rust can't. A few of the larger and common examples would be, specialization, placement and variadic generics.

At least variadic generics isn't really a performance thing, it's just an example of a rough edge you run into here and there. Specialization and placement can be pretty important for performance though!

[ Parent | on HN ]
Re:Const vs. constexpr vs. consteval vs. constinit in C++20 by estebank on Tuesday November 29, 2022 @12:41AM (#33784078)
Placement is not yet a language feature, but it can be expressed in a verbose manner and some have written macros for it.
[ Parent | on HN ]
Re:Const vs. constexpr vs. consteval vs. constinit in C++20 by virtualritz on Tuesday November 29, 2022 @07:56AM (#33787008)
I was asking in the context of OPs claim. And that was regarding low level optimizations. I think only placement is a valid counterexample here but AFAIK there is support for Rust in that, if a bit elaborate in expression.
[ Parent | on HN ]