Objects and classes in Rust

Question

I am fiddling around with Rust, going by the examples, trying to make a class. I have been looking at the example of StatusLineText

It keeps raising the errors:

error: `self` is not available in a static method. Maybe a `self` argument is missing? [E0424]             self.id + self.extra             ^~~~  error: no method named `get_total` found for type `main::Thing` in the current scope     println!("the thing's total is {}", my_thing.get_total());                                                  ^~~~~~~~~ 

My code is rather simple:

fn main() {     struct Thing {         id: i8,         extra: i8,     }      impl Thing {         pub fn new() -> Thing {             Thing { id: 3, extra: 2 }         }         pub fn get_total() -> i8 {             self.id + self.extra         }     }      let my_thing = Thing::new();     println!("the thing's total is {}", my_thing.get_total()); } 

Answer 1

You need to add an explicit self parameter to make methods:

fn get_total(&self) -> i8 {     self.id + self.extra } 

Functions without the explicit self parameter are considered associated functions, which can be called without a specific instance.