Bump atomic dependency to the latest

Author: SpriteOvO

spdlog/Cargo.toml

@@ -47,7 +47,8 @@ sval = ["value-bag/sval"]
 
 [dependencies]
 arc-swap = "1.5.1"
-atomic = "0.5.1"
+atomic = "0.6.1"
+bytemuck = { version = "1.24.0", features = ["derive"] }
 chrono = "0.4.22"
 crossbeam = { version = "0.8.2", optional = true }
 dyn-clone = "1.0.14"

spdlog/src/level.rs

@@ -94,6 +94,11 @@ impl Level {
         }
     }
 
+    #[must_use]
+    fn as_repr(self) -> u16 {
+        self as u16
+    }
+
     #[must_use]
     const fn min_usize() -> usize {
         Self::most_severe() as usize
@@ -310,11 +315,11 @@ impl From<log::LevelFilter> for LevelFilter {
 
 // Atomic
 
-#[repr(align(4))]
-#[derive(Copy, Clone, Eq, PartialEq, Hash, Debug)]
+#[repr(C, align(4))]
+#[derive(Copy, Clone, Eq, PartialEq, Hash, Debug, bytemuck::NoUninit)]
 struct AtomicLevelFilterInner {
     discriminant: u16, // Keep the type in sync with the repr of `LevelFilter`
-    level: Level,      // Keep the type in sync with the variants of `LevelFilter`
+    level: u16,        // Keep the type in sync with the variants of `LevelFilter`
 }
 
 impl AtomicLevelFilterInner {
@@ -325,15 +330,15 @@ impl From<LevelFilter> for AtomicLevelFilterInner {
     fn from(value: LevelFilter) -> Self {
         Self {
             discriminant: value.discriminant(),
-            level: value.level().unwrap_or(Self::UNDEFINED_FALLBACK),
+            level: value.level().unwrap_or(Self::UNDEFINED_FALLBACK).as_repr(),
         }
     }
 }
 
 impl From<AtomicLevelFilterInner> for LevelFilter {
     fn from(inner: AtomicLevelFilterInner) -> Self {
         // SAFETY:
-        // TODO
+        // `AtomicLevelFilterInner` and `LevelFilter` have the same layout.
         unsafe { mem::transmute(inner) }
     }
 }