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21 lines
448 B
Rust
21 lines
448 B
Rust
use std::sync::atomic::{AtomicUsize, Ordering};
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/// A unique identifier, not guaranteed to be generated in any order.
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pub type Id = usize;
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lazy_static! {
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static ref LAST_ID: AtomicUsize = AtomicUsize::new(0);
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}
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/// Generate a new ID, which has no defined ordering.
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pub fn get_id() -> Id {
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LAST_ID.fetch_add(1, Ordering::SeqCst)
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}
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#[test]
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fn it_gives_unique_numbers() {
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let a = get_id();
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let b = get_id();
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assert!(a != b);
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} |