Make metadata and slice accessors const

src/guard.rs

@@ -69,7 +69,7 @@ impl<'vec, T> ContentGuard<'vec, T> {
 
     /// Returns the allocation's capacity in elements.
     #[must_use]
-    pub fn capacity(&self) -> usize {
+    pub const fn capacity(&self) -> usize {
         self.erased.capacity()
     }
 
@@ -80,26 +80,26 @@ impl<'vec, T> ContentGuard<'vec, T> {
 
     /// Returns the number of initialized elements.
     #[must_use]
-    pub fn length(&self) -> usize {
+    pub const fn length(&self) -> usize {
         self.erased.length()
     }
 
     /// Returns `true` when there are no initialized elements.
     #[must_use]
-    pub fn is_empty(&self) -> bool {
+    pub const fn is_empty(&self) -> bool {
         self.erased.is_empty()
     }
 
     /// Borrows the initialized elements as a slice.
     #[must_use]
-    pub fn as_slice(&self) -> &[T] {
+    pub const fn as_slice(&self) -> &[T] {
         // SAFETY: The pointer and length correctly represent the currently initialized elements.
         unsafe { self.erased.parts.as_slice() }
     }
 
     /// Mutably borrows the initialized elements as a slice.
     #[must_use]
-    pub fn as_slice_mut(&mut self) -> &mut [T] {
+    pub const fn as_slice_mut(&mut self) -> &mut [T] {
         // SAFETY: The pointer and length correctly represent the currently initialized elements.
         unsafe { self.erased.parts.as_slice_mut() }
     }
@@ -107,7 +107,7 @@ impl<'vec, T> ContentGuard<'vec, T> {
     /// Consumes the guard and borrows the initialized elements for the erased
     /// vector's lifetime.
     #[must_use]
-    pub fn into_slice(self) -> &'vec [T] {
+    pub const fn into_slice(self) -> &'vec [T] {
         // SAFETY: The pointer and length correctly represent the currently initialized elements.
         unsafe { self.erased.parts.as_slice() }
     }
@@ -115,7 +115,7 @@ impl<'vec, T> ContentGuard<'vec, T> {
     /// Consumes the guard and mutably borrows the initialized elements for the
     /// erased vector's lifetime.
     #[must_use]
-    pub fn into_slice_mut(self) -> &'vec mut [T] {
+    pub const fn into_slice_mut(self) -> &'vec mut [T] {
         // SAFETY: The pointer and length correctly represent the currently initialized elements.
         unsafe { self.erased.parts.as_slice_mut() }
     }

src/lib.rs

@@ -101,25 +101,25 @@ impl TypeErasedVec {
 
     /// Returns the element layout associated with the allocation.
     #[must_use]
-    pub fn layout(&self) -> Layout {
+    pub const fn layout(&self) -> Layout {
         self.layout
     }
 
     /// Returns the allocation's capacity in elements.
     #[must_use]
-    pub fn capacity(&self) -> usize {
+    pub const fn capacity(&self) -> usize {
         self.parts.cap
     }
 
     /// Returns the number of initialized elements.
     #[must_use]
-    pub fn length(&self) -> usize {
+    pub const fn length(&self) -> usize {
         self.parts.len
     }
 
     /// Returns `true` when there are no initialized elements.
     #[must_use]
-    pub fn is_empty(&self) -> bool {
+    pub const fn is_empty(&self) -> bool {
         self.parts.len == 0
     }
 
@@ -128,7 +128,7 @@ impl TypeErasedVec {
     /// Zero-sized elements always report zero bytes, regardless of their
     /// logical capacity.
     #[must_use]
-    pub fn capacity_bytes(&self) -> usize {
+    pub const fn capacity_bytes(&self) -> usize {
         self.parts.cap * self.layout.size()
     }
 

src/parts.rs

@@ -22,13 +22,13 @@ impl VecParts {
     }
 
     #[must_use]
-    pub(super) unsafe fn as_slice<T>(&self) -> &[T] {
+    pub(super) const unsafe fn as_slice<T>(&self) -> &[T] {
         // SAFETY: Ensured by the caller
         unsafe { std::slice::from_raw_parts(self.ptr.as_ptr().cast(), self.len) }
     }
 
     #[must_use]
-    pub(super) unsafe fn as_slice_mut<T>(&mut self) -> &mut [T] {
+    pub(super) const unsafe fn as_slice_mut<T>(&mut self) -> &mut [T] {
         // SAFETY: Ensured by the caller
         unsafe { std::slice::from_raw_parts_mut(self.ptr.as_ptr().cast(), self.len) }
     }

src/send.rs

@@ -44,31 +44,31 @@ macro_rules! define_thread_safe_erased_vec {
 
             /// Returns the element layout associated with the allocation.
             #[must_use]
-            pub fn layout(&self) -> Layout {
+            pub const fn layout(&self) -> Layout {
                 self.0.layout()
             }
 
             /// Returns the allocation's capacity in elements.
             #[must_use]
-            pub fn capacity(&self) -> usize {
+            pub const fn capacity(&self) -> usize {
                 self.0.capacity()
             }
 
             /// Returns the number of initialized elements.
             #[must_use]
-            pub fn length(&self) -> usize {
+            pub const fn length(&self) -> usize {
                 self.0.length()
             }
 
             /// Returns `true` when there are no initialized elements.
             #[must_use]
-            pub fn is_empty(&self) -> bool {
+            pub const fn is_empty(&self) -> bool {
                 self.0.is_empty()
             }
 
             /// Returns the allocation's capacity in bytes.
             #[must_use]
-            pub fn capacity_bytes(&self) -> usize {
+            pub const fn capacity_bytes(&self) -> usize {
                 self.0.capacity_bytes()
             }