axiolid-model 0.1.0

Format-neutral geometry item tree. The currency between a format reader and a kernel.
Documentation 
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//! Typed graph identity.

use core::fmt;
use core::sync::atomic::{AtomicU64, Ordering};

static NEXT_GRAPH_ID: AtomicU64 = AtomicU64::new(1);

#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub(crate) struct GraphId(u64);

impl GraphId {
    pub(crate) fn fresh() -> Self {
        let value = NEXT_GRAPH_ID
            .fetch_update(Ordering::Relaxed, Ordering::Relaxed, |current| {
                current.checked_add(1)
            })
            .expect("geometry graph identity space exhausted");
        Self(value)
    }
}

/// Stable index owned by one immutable [`crate::GeometryGraph`].
#[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
pub struct NodeId {
    graph: GraphId,
    index: u32,
}

impl NodeId {
    pub(crate) fn from_index(graph: GraphId, index: usize) -> Self {
        Self {
            graph,
            index: u32::try_from(index).expect("geometry graph exceeds u32 capacity"),
        }
    }

    pub(crate) fn belongs_to(self, graph: GraphId) -> bool {
        self.graph == graph
    }

    /// Zero-based graph index.
    pub const fn index(self) -> usize {
        self.index as usize
    }
}

impl fmt::Display for NodeId {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        write!(f, "geometry#{}", self.index)
    }
}