What's the idiomatic way to generate a unique sequential i32 ids in new struct instances

help
1

Hi. I want my struct to contain a unique i32 in a private field. I'll use them as ids. The code below requires unsafe block:

mod MyTypes {
    static mut COUNTER: i32 = 0;

    pub struct MyStruct {
        id: i32,
    }

    impl MyStruct {
        fn new() -> Self {
            COUNTER += 1;
            Self { id: COUNTER }
        }
    }
}

Now of course, I can create unix timestamps in the constructor method and use them as ids but are there any other methods?

2

Use atomic integers. Your current code does not guarantee unique ids in multi-threaded code, which is why it requires unsafe, and using it from multi-threaded code would be undefined behaviour because of data races.