archetype_ecs 1.2.0

Archetype ECS - High-performance Entity Component System with parallel execution
Documentation 
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//! Utility functions

/// Generate unique ID
pub fn next_id() -> u64 {
    use std::sync::atomic::{AtomicU64, Ordering};
    static COUNTER: AtomicU64 = AtomicU64::new(0);
    COUNTER.fetch_add(1, Ordering::Relaxed)
}

/// Align value to power of 2
pub fn align_to(value: usize, alignment: usize) -> usize {
    (value + alignment - 1) & !(alignment - 1)
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_next_id() {
        let id1 = next_id();
        let id2 = next_id();
        assert_ne!(id1, id2);
    }

    #[test]
    fn test_align_to() {
        assert_eq!(align_to(0, 8), 0);
        assert_eq!(align_to(1, 8), 8);
        assert_eq!(align_to(7, 8), 8);
        assert_eq!(align_to(8, 8), 8);
        assert_eq!(align_to(9, 8), 16);
    }
}