Probably by using a third-party library, with a pre-concepts-based implementation which is heavy on compile times. Unlike Rust, where they're built in and don't

Probably by using a third-party library, with a pre-concepts-based implementation which is heavy on compile times. Unlike Rust, where they're built in and don't really have that cost. The context here is comparison between Rust and C++, for a side project begun over a year ago. Citing pre-standard C++ features with partial/experimental third party implementations doesn't really make the difference you seem to think, in that context.