Add is_full method (#217)

Author: wojciech-graj

fuzz/src/bin/arrayish.rs

@@ -25,6 +25,7 @@ arbitrary_stateful_operations! {
             fn extend_from_slice(&mut self, sli: &Box<[T]>);
             fn insert(&mut self, index: usize, item: T);
             fn is_empty(&self) -> bool;
+            fn is_full(&self) -> bool;
             fn len(&self) -> usize;
             fn pop(&mut self) -> Option<T>;
             fn push(&mut self, item: T);

fuzz/src/bin/slicevec.rs

@@ -23,6 +23,7 @@ arbitrary_stateful_operations! {
             fn extend_from_slice(&mut self, sli: &Box<[T]>);
             fn insert(&mut self, index: usize, item: T);
             fn is_empty(&self) -> bool;
+            fn is_full(&self) -> bool;
             fn len(&self) -> usize;
             fn pop(&mut self) -> Option<T>;
             fn push(&mut self, item: T);

src/arrayvec.rs

@@ -628,6 +628,13 @@ impl<A: Array> ArrayVec<A> {
     self.len == 0
   }
 
+  /// Checks if the length is equal to capacity.
+  #[inline(always)]
+  #[must_use]
+  pub fn is_full(&self) -> bool {
+    self.len() == self.capacity()
+  }
+
   /// The length of the `ArrayVec` (in elements).
   #[inline(always)]
   #[must_use]

src/slicevec.rs

@@ -293,6 +293,13 @@ impl<'s, T> SliceVec<'s, T> {
     self.len == 0
   }
 
+  /// Checks if the length is equal to capacity.
+  #[inline(always)]
+  #[must_use]
+  pub fn is_full(&self) -> bool {
+    self.len() == self.capacity()
+  }
+
   /// The length of the `SliceVec` (in elements).
   #[inline(always)]
   #[must_use]