got blankets working

Author: molpopgen

src/table_column.rs

@@ -10,6 +10,10 @@ impl<T> std::ops::Index<usize> for OpaqueTableColumn<'_, T> {
     }
 }
 
+trait NewTypeMarker: TryInto<usize, Error = crate::TskitError> {}
+
+impl NewTypeMarker for crate::EdgeId {}
+
 impl<T> std::ops::Index<crate::SizeType> for OpaqueTableColumn<'_, T> {
     type Output = T;
 
@@ -18,10 +22,13 @@ impl<T> std::ops::Index<crate::SizeType> for OpaqueTableColumn<'_, T> {
     }
 }
 
-impl<T> std::ops::Index<crate::EdgeId> for OpaqueTableColumn<'_, T> {
+impl<I, T> std::ops::Index<I> for OpaqueTableColumn<'_, T>
+where
+    I: NewTypeMarker,
+{
     type Output = T;
-    fn index(&self, index: crate::EdgeId) -> &Self::Output {
-        &self.0[usize::try_from(index).unwrap()]
+    fn index(&self, index: I) -> &Self::Output {
+        &self.0[index.try_into().unwrap()]
     }
 }
 
@@ -33,8 +40,11 @@ pub trait TableColumn<I, T>:
     fn as_slice(&self) -> &[T];
 }
 
-impl TableColumn<crate::EdgeId, crate::NodeId> for OpaqueTableColumn<'_, crate::NodeId> {
-    fn as_slice(&self) -> &[crate::NodeId] {
+impl<I, T> TableColumn<I, T> for OpaqueTableColumn<'_, T>
+where
+    I: NewTypeMarker,
+{
+    fn as_slice(&self) -> &[T] {
         self.0
     }
 }