Method contains_parts

perro_source/render_stack/perro_graphics/src/resources.rs:35–46

(&self, index: u32, generation: u32)

#[derive(Default)]
struct SlotArena {
    generations: Vec<u32>,
    occupied: Vec<bool>,
    free_slots: Vec<usize>,
}

impl SlotArena {
    #[inline]
    fn create_parts(&mut self) -> (u32, u32) {
        if let Some(slot) = self.free_slots.pop() {
            self.generations[slot] = self.generations[slot].wrapping_add(1);
            self.occupied[slot] = true;
            return ((slot + 1) as u32, self.generations[slot]);
        }