impl<A: Array> TryFrom<&[A::Item]> for ArrayVec<A>

For issue #106

src/lib.rs

@@ -708,6 +708,30 @@ impl<A: Array> From<A> for ArrayVec<A> {
 }
 
 
+/// Try to create an `ArrayVec` from a slice. This will return an error if the slice was too big to
+/// fit.
+///
+/// ```
+/// use arrayvec::ArrayVec;
+/// use std::convert::TryInto as _;
+///
+/// let mut array: ArrayVec<[_; 4]> = (&[1, 2, 3] as &[_]).try_into().unwrap();
+/// assert_eq!(array.len(), 3);
+/// assert_eq!(array.capacity(), 4);
+/// ```
+impl<A: Array> std::convert::TryFrom<&[A::Item]> for ArrayVec<A>
+    where
+        A::Item: Copy,
+{
+    type Error = CapacityError;
+
+    fn try_from(slice: &[A::Item]) -> Result<Self, Self::Error> {
+        let mut array = Self::new();
+        array.try_extend_from_slice(slice).map(|()| array)
+    }
+}
+
+
 /// Iterate the `ArrayVec` with references to each element.
 ///
 /// ```