gc-lite 0.4.3

A simple partitioned garbage collector
Documentation 
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// SPDX-License-Identifier: Apache-2.0
// SPDX-FileCopyrightText: Copyright (c) 2025-2026 John Ray <996351336@qq.com>

use std::ptr::NonNull;

use crate::{GcHead, GcHeap, GcPartitionId};

impl GcHead {
    /// Get cross scope reference
    #[deprecated]
    pub fn xref(&self) -> GcPartitionId {
        let p = (self.partition >> 16) as u16;
        GcPartitionId(p)
    }

    /// Set cross scope reference.
    ///
    /// # Return
    ///
    /// * true if node has xref set
    /// * false if node has xref unset
    #[deprecated]
    pub(crate) fn set_xref(&mut self, xref: GcPartitionId) -> bool {
        if !xref.is_null() && xref != self.partition_id() {
            log::trace!("[set_xref] {xref:?} -> {self:?}");
            self.partition = (self.partition & 0x0000_FFFF) | ((xref.0 as u32) << 16);
            true
        } else {
            self.partition &= 0x0000_FFFF;
            false
        }
    }

    /// Unset cross scope reference
    #[deprecated]
    #[inline(always)]
    pub fn unset_xref(&mut self) {
        self.set_xref(GcPartitionId::NONE);
    }
}

impl GcHeap {
    #[deprecated]
    pub const fn set_xref(&mut self, from_scope: GcPartitionId, node: NonNull<GcHead>) -> bool {
        false
    }
}