Add skeleton of table column types

Author: molpopgen

src/lib.rs

@@ -83,6 +83,7 @@
 pub use sys::bindings;
 
 mod _macros; // Starts w/_ to be sorted at front by rustfmt!
+mod table_column;
 mod edge_differences;
 mod edge_table;
 pub mod error;

src/table_column.rs

@@ -0,0 +1,55 @@
+#[derive(Clone, Debug)]
+#[repr(transparent)]
+pub struct TableColumn<'table, T>(&'table [T]);
+
+#[derive(Debug)]
+#[repr(transparent)]
+pub struct MutableTableColumn<'table, T>(&'table mut [T]);
+
+// NOT part of tskit's public API
+pub fn new_table_column<T>(data: &[T]) -> TableColumn<'_, T> {
+    TableColumn(data)
+}
+
+// NOT part of tskit's public API
+pub fn new_mutable_table_column<T>(data: &mut [T]) -> MutableTableColumn<'_, T> {
+    MutableTableColumn(data)
+}
+
+impl<T> std::convert::AsRef<[T]> for TableColumn<'_, T> {
+    fn as_ref(&self) -> &[T] {
+        self.0
+    }
+}
+
+impl<T> std::convert::AsRef<[T]> for MutableTableColumn<'_, T> {
+    fn as_ref(&self) -> &[T] {
+        self.0
+    }
+}
+
+impl<T> std::convert::AsMut<[T]> for MutableTableColumn<'_, T> {
+    fn as_mut(&mut self) -> &mut [T] {
+        self.0
+    }
+}
+
+impl<T> std::ops::Index<usize> for TableColumn<'_, T> {
+    type Output = T;
+    fn index(&self, index: usize) -> &Self::Output {
+        &self.0[index]
+    }
+}
+
+impl<T> std::ops::Index<usize> for MutableTableColumn<'_, T> {
+    type Output = T;
+    fn index(&self, index: usize) -> &Self::Output {
+        &self.0[index]
+    }
+}
+
+impl<T> std::ops::IndexMut<usize> for MutableTableColumn<'_, T> {
+    fn index_mut(&mut self, index: usize) -> &mut Self::Output {
+        self.0.index_mut(index)
+    }
+}