From ded44ec228b3eaceed820585882414831eb196c0 Mon Sep 17 00:00:00 2001
From: Mica White <botahamec@outlook.com>
Date: Fri, 8 Mar 2024 15:47:40 -0500
Subject: Extra lifetime shenanigans

---
 src/guard.rs | 30 ++++++++++++++++++++----------
 1 file changed, 20 insertions(+), 10 deletions(-)

(limited to 'src/guard.rs')

diff --git a/src/guard.rs b/src/guard.rs
index 30e7d4a..12021e2 100644
--- a/src/guard.rs
+++ b/src/guard.rs
@@ -1,21 +1,26 @@
-use std::ops::{Deref, DerefMut};
+use std::{
+	marker::PhantomData,
+	ops::{Deref, DerefMut},
+};
 
 use crate::{key::Keyable, lockable::Lockable};
 
 /// A guard for a generic [`Lockable`] type.
-pub struct LockGuard<'a, L: Lockable<'a>, Key: Keyable> {
+pub struct LockGuard<'a, 'key: 'a, L: Lockable<'a>, Key: Keyable + 'key> {
 	guard: L::Output,
-	_key: Key,
+	key: Key,
+	_phantom: PhantomData<&'key ()>,
 }
 
-impl<'a, L: Lockable<'a>, Key: Keyable> LockGuard<'a, L, Key> {
+impl<'a, 'key: 'a, L: Lockable<'a>, Key: Keyable> LockGuard<'a, 'key, L, Key> {
 	/// Locks the lockable type and returns a guard that can be used to access
 	/// the underlying data.
 	pub fn lock(lock: &'a L, key: Key) -> Self {
 		Self {
 			// safety: we have the thread's key
 			guard: unsafe { lock.lock() },
-			_key: key,
+			key,
+			_phantom: PhantomData,
 		}
 	}
 
@@ -24,18 +29,23 @@ impl<'a, L: Lockable<'a>, Key: Keyable> LockGuard<'a, L, Key> {
 	/// is given back as an error.
 	pub fn try_lock(lock: &'a L, key: Key) -> Option<Self> {
 		// safety: we have the thread's key
-		unsafe { lock.try_lock() }.map(|guard| Self { guard, _key: key })
+		unsafe { lock.try_lock() }.map(|guard| Self {
+			guard,
+			key,
+			_phantom: PhantomData,
+		})
 	}
 
 	/// Unlocks the underlying lockable data type, returning the key that's
 	/// associated with it.
 	#[allow(clippy::missing_const_for_fn)]
-	pub fn unlock(self) {
-		L::unlock(self.guard);
+	pub fn unlock(guard: Self) -> Key {
+		L::unlock(guard.guard);
+		guard.key
 	}
 }
 
-impl<'a, L: Lockable<'a>, Key: Keyable> Deref for LockGuard<'a, L, Key> {
+impl<'a, 'key: 'a, L: Lockable<'a>, Key: Keyable> Deref for LockGuard<'a, 'key, L, Key> {
 	type Target = L::Output;
 
 	fn deref(&self) -> &Self::Target {
@@ -43,7 +53,7 @@ impl<'a, L: Lockable<'a>, Key: Keyable> Deref for LockGuard<'a, L, Key> {
 	}
 }
 
-impl<'a, L: Lockable<'a>, Key: Keyable> DerefMut for LockGuard<'a, L, Key> {
+impl<'a, 'key: 'a, L: Lockable<'a>, Key: Keyable> DerefMut for LockGuard<'a, 'key, L, Key> {
 	fn deref_mut(&mut self) -> &mut Self::Target {
 		&mut self.guard
 	}
-- 
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