Add into_scalar method for Array0

Author: jturner314

src/impl_owned_array.rs

@@ -1,5 +1,29 @@
 use imp_prelude::*;
 
+/// Methods specific to `Array0`.
+///
+/// ***See also all methods for [`ArrayBase`]***
+///
+/// [`ArrayBase`]: struct.ArrayBase.html
+impl<A> Array<A, Ix0> {
+    /// Returns the single element in the array without cloning it.
+    ///
+    /// ```
+    /// use ndarray::{arr0, Array0};
+    ///
+    /// // `Foo` doesn't implement `Clone`.
+    /// #[derive(Debug, Eq, PartialEq)]
+    /// struct Foo;
+    ///
+    /// let array: Array0<Foo> = arr0(Foo);
+    /// let scalar: Foo = array.into_scalar();
+    /// assert_eq!(scalar, Foo);
+    /// ```
+    pub fn into_scalar(mut self) -> A {
+        self.data.0.remove(0)
+    }
+}
+
 /// Methods specific to `Array`.
 ///
 /// ***See also all methods for [`ArrayBase`]***