cranpose-core 0.20.0

Composition runtime and reactive state for Cranpose
Documentation 
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use crate::slot;

/// Stable identifier for a slot in the slot table.
///
/// Anchors provide positional stability: they maintain their identity even when
/// the slot table is reorganized (e.g., during conditional rendering or group moves).
/// This prevents effect states from being prematurely removed during recomposition.
#[derive(Copy, Clone, Debug, Hash, Eq, PartialEq, Default)]
pub struct AnchorId {
    pub(crate) id: u32,
    pub(crate) generation: u32,
}

impl AnchorId {
    pub(crate) const INVALID: Self = Self {
        id: 0,
        generation: 0,
    };

    pub(crate) fn new(id: usize) -> Self {
        Self {
            id: slot::checked_usize_to_u32(id, "anchor id"),
            generation: 1,
        }
    }

    /// Check if this anchor is valid (non-zero).
    pub fn is_valid(&self) -> bool {
        self.id != 0
    }
}