another option, seems bad

Author: molpopgen

src/table_column.rs

@@ -31,6 +31,23 @@ impl<T> MutableTableColumn<'_, T> {
     }
 }
 
+pub trait NTColumn<T> {
+    fn as_slice(&self) -> &[T];
+}
+
+impl<T> NTColumn<T> for TableColumn<'_, T> {
+    fn as_slice(&self) -> &[T] {
+        self.as_slice()
+    }
+}
+
+impl<C> std::ops::Index<usize> for dyn NTColumn<C> {
+    type Output = C;
+    fn index(&self, index: usize) -> &Self::Output {
+        &self.as_slice()[index]
+    }
+}
+
 macro_rules! make_table_column {
     ($name: ident, $index: ident) => {
         /// Immutable view of a column