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Unless you use `dyn`, all code is monomorphized, and that code on its own will get optimized. This does come with code-bloat. So the Rust std sometimes exposes

• dwattttt 9mo ago
  > This does come with code-bloat. So the Rust std sometimes exposes a generic function (which gets monomorphized), but internally passes it off to a non-generic function. There's no free lunch here. Reducing the amount of code that's monomorphised reduces the code emitted & improves compile times, but it reduces the scope of the code that's exposed to the input type, which reduces optimisation opportunities.
  • josephg 9mo ago
    Yes. But I like that rust gives you the option. In C, the only way to write a monomorphized hash table or array list involves horribly ugly macros that are difficult to write and debug. Rust does monomorphization by default, but you can also use &dyn trait for vtable-like behaviour if you prefer.
• bonzini 9mo ago
  There is also the "momo" crate to do the same with a procedural macro attribute (https://docs.rs/momo/latest/momo/ https://docs.rs/momo/latest/momo/).