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