129 lines
3.7 KiB
Rust
129 lines
3.7 KiB
Rust
use std::{
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fmt::{Debug, Display},
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ops::{Deref, DerefMut},
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};
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/// A reference to a value in a generational box.
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pub struct GenerationalRef<R> {
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pub(crate) inner: R,
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#[cfg(any(debug_assertions, feature = "debug_borrows"))]
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pub(crate) borrow: GenerationalRefBorrowInfo,
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}
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impl<T: 'static, R: Deref<Target = T>> GenerationalRef<R> {
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pub(crate) fn new(
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inner: R,
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#[cfg(any(debug_assertions, feature = "debug_borrows"))] borrow: GenerationalRefBorrowInfo,
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) -> Self {
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Self {
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inner,
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#[cfg(any(debug_assertions, feature = "debug_borrows"))]
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borrow,
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}
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}
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}
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impl<T: ?Sized + Debug, R: Deref<Target = T>> Debug for GenerationalRef<R> {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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self.inner.deref().fmt(f)
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}
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}
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impl<T: ?Sized + Display, R: Deref<Target = T>> Display for GenerationalRef<R> {
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fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
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self.inner.deref().fmt(f)
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}
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}
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impl<T: ?Sized + 'static, R: Deref<Target = T>> Deref for GenerationalRef<R> {
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type Target = T;
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fn deref(&self) -> &Self::Target {
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self.inner.deref()
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}
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}
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#[cfg(any(debug_assertions, feature = "debug_borrows"))]
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/// Information about a borrow.
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pub struct GenerationalRefBorrowInfo {
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pub(crate) borrowed_at: &'static std::panic::Location<'static>,
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pub(crate) borrowed_from: &'static crate::MemoryLocationBorrowInfo,
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pub(crate) created_at: &'static std::panic::Location<'static>,
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}
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#[cfg(any(debug_assertions, feature = "debug_borrows"))]
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impl Drop for GenerationalRefBorrowInfo {
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fn drop(&mut self) {
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self.borrowed_from
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.borrowed_at
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.write()
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.retain(|location| !std::ptr::eq(*location, self.borrowed_at as *const _));
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}
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}
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/// A mutable reference to a value in a generational box.
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pub struct GenerationalRefMut<W> {
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pub(crate) inner: W,
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#[cfg(any(debug_assertions, feature = "debug_borrows"))]
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pub(crate) borrow: GenerationalRefBorrowMutGuard,
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}
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impl<T, R: DerefMut<Target = T>> GenerationalRefMut<R> {
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pub(crate) fn new(
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inner: R,
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#[cfg(any(debug_assertions, feature = "debug_borrows"))]
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borrow: GenerationalRefMutBorrowInfo,
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) -> Self {
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Self {
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inner,
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#[cfg(any(debug_assertions, feature = "debug_borrows"))]
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borrow: borrow.into(),
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}
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}
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}
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impl<T: ?Sized, W: DerefMut<Target = T>> Deref for GenerationalRefMut<W> {
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type Target = T;
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fn deref(&self) -> &Self::Target {
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self.inner.deref()
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}
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}
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impl<T: ?Sized, W: DerefMut<Target = T>> DerefMut for GenerationalRefMut<W> {
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fn deref_mut(&mut self) -> &mut Self::Target {
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self.inner.deref_mut()
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}
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}
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#[cfg(any(debug_assertions, feature = "debug_borrows"))]
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/// Information about a mutable borrow.
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pub struct GenerationalRefMutBorrowInfo {
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/// The location where the borrow occurred.
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pub(crate) borrowed_from: &'static crate::MemoryLocationBorrowInfo,
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pub(crate) created_at: &'static std::panic::Location<'static>,
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}
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#[cfg(any(debug_assertions, feature = "debug_borrows"))]
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pub(crate) struct GenerationalRefBorrowMutGuard {
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borrow_info: GenerationalRefMutBorrowInfo,
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}
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#[cfg(any(debug_assertions, feature = "debug_borrows"))]
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impl From<GenerationalRefMutBorrowInfo> for GenerationalRefBorrowMutGuard {
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fn from(borrow_info: GenerationalRefMutBorrowInfo) -> Self {
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Self { borrow_info }
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}
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}
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#[cfg(any(debug_assertions, feature = "debug_borrows"))]
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impl Drop for GenerationalRefBorrowMutGuard {
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fn drop(&mut self) {
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self.borrow_info
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.borrowed_from
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.borrowed_mut_at
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.write()
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.take();
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}
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}
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