Traits now support async fn and -> impl Trait (with some limitations), the compiler got faster, version = in Cargo.toml is now optional, and many small functions have been stabilized!

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[–] xav 13 points 11 months ago (5 children)

I find it's a mix between ML languages and C++, and knowing one of them would help yes. If you're tired if chasing a wild pointer because of a subtle use-after-free in a multithreaded monster under gdb, you'll love #rust.

[–] tatterdemalion 15 points 11 months ago* (last edited 11 months ago) (4 children)

Honestly the only things that are similar to C++ are small amounts of C-like syntax, RAII, smart pointers, and iterators. And even so, Rust improves those features a lot. The list of things that Rust rejects from C++ is much larger; Rust does not have:

new and delete (perhaps discouraged in modern C++)
function overloading
inheritance (replaced by composition or traits)
friend classes (replaced by modules)
exceptions (replaced by Result values)
6 different kinds of first-class constructors (hallelujah)
templates (replaced by constrained parametric polymorphism)
variable mutability by default

Rust does OOP very differently and leans harder into functional paradigms.

[–] xav 4 points 11 months ago* (last edited 11 months ago) (1 children)

You could argue that C++'s new is Rust's Box::new, and delete is replaced by RAII. Same concepts but way better ergonomy.

[–] [email protected] 1 points 10 months ago

box::new is pretty directly analogous to std::make_unique (factory for unique_ptr), in general rust’s heap allocating types map to c++’s smart pointer types, which are basically universally recommended over raw new/delete. So another column where rust just gives you the one best C++ feature where it still has 4 supported versions.

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