Is it possible to declare local anonymous structs in Rust?

Question

Sometimes I like to group related variables in a function, without declaring a new struct type.

In C this can be done, e.g.:

void my_function() {         struct {         int x, y;         size_t size;     } foo = {1, 1, 0};     // .... } 

Is there a way to do this in Rust? If not, what would be the closest equivalent?

Answer 1

While anonymous structs aren't supported, you can scope them locally, to do almost exactly as you've described in the C version:

fn main() {      struct Example<'a> {         name: &'a str     };      let obj = Example { name: "Simon" };     let obj2 = Example { name: "ideasman42" };      println!("{}", obj.name); // Simon     println!("{}", obj2.name); // ideasman42 } 

Playground link

One other option is a tuple:

fn main() {      let obj = (1, 0, 1);      println!("{}", obj.0);     println!("{}", obj.1);     println!("{}", obj.2); } 

Playground link