Add is_empty method for ArrayVec and ArrayString

Author: nicbn

src/array_string.rs

@@ -71,6 +71,10 @@ impl<A> ArrayString<A>
     #[inline]
     pub fn len(&self) -> usize { self.len.to_usize() }
 
+    /// Returns whether the string is empty.
+    #[inline]
+    pub fn is_empty(&self) -> bool { self.len() == 0 }
+
     /// Create a new `ArrayString` from a `str`.
     ///
     /// Capacity is inferred from the type parameter.

src/lib.rs

@@ -126,6 +126,18 @@ impl<A: Array> ArrayVec<A> {
     #[inline]
     pub fn len(&self) -> usize { self.len.to_usize() }
 
+    /// Returns whether the `ArrayVec` is empty.
+    ///
+    /// ```
+    /// use arrayvec::ArrayVec;
+    ///
+    /// let mut array = ArrayVec::from([1]);
+    /// array.pop();
+    /// assert_eq!(array.is_empty(), true);
+    /// ```
+    #[inline]
+    pub fn is_empty(&self) -> bool { self.len() == 0 }
+
     /// Return the capacity of the `ArrayVec`.
     ///
     /// ```