Add EdgeId (#138)

src/edge_table.rs

@@ -1,14 +1,15 @@
 use crate::bindings as ll_bindings;
 use crate::metadata;
 use crate::{tsk_id_t, tsk_size_t, TskitError};
+use crate::{EdgeId, NodeId};
 
 /// Row of an [`EdgeTable`]
 pub struct EdgeTableRow {
-    pub id: tsk_id_t,
+    pub id: EdgeId,
     pub left: f64,
     pub right: f64,
-    pub parent: tsk_id_t,
-    pub child: tsk_id_t,
+    pub parent: NodeId,
+    pub child: NodeId,
     pub metadata: Option<Vec<u8>>,
 }
 
@@ -26,7 +27,7 @@ impl PartialEq for EdgeTableRow {
 fn make_edge_table_row(table: &EdgeTable, pos: tsk_id_t) -> Option<EdgeTableRow> {
     if pos < table.num_rows() as tsk_id_t {
         let rv = EdgeTableRow {
-            id: pos,
+            id: pos.into(),
             left: table.left(pos).unwrap(),
             right: table.right(pos).unwrap(),
             parent: table.parent(pos).unwrap(),
@@ -87,8 +88,8 @@ impl<'a> EdgeTable<'a> {
     ///
     /// Will return [``IndexError``](crate::TskitError::IndexError)
     /// if ``row`` is out of range.
-    pub fn parent(&'a self, row: tsk_id_t) -> Result<tsk_id_t, TskitError> {
-        unsafe_tsk_column_access!(row, 0, self.num_rows(), self.table_.parent)
+    pub fn parent<E: Into<EdgeId> + Copy>(&'a self, row: E) -> Result<NodeId, TskitError> {
+        unsafe_tsk_column_access!(row.into().0, 0, self.num_rows(), self.table_.parent, NodeId)
     }
 
     /// Return the ``child`` value from row ``row`` of the table.
@@ -97,8 +98,8 @@ impl<'a> EdgeTable<'a> {
     ///
     /// Will return [``IndexError``](crate::TskitError::IndexError)
     /// if ``row`` is out of range.
-    pub fn child(&'a self, row: tsk_id_t) -> Result<tsk_id_t, TskitError> {
-        unsafe_tsk_column_access!(row, 0, self.num_rows(), self.table_.child)
+    pub fn child<E: Into<EdgeId> + Copy>(&'a self, row: E) -> Result<NodeId, TskitError> {
+        unsafe_tsk_column_access!(row.into().0, 0, self.num_rows(), self.table_.child, NodeId)
     }
 
     /// Return the ``left`` value from row ``row`` of the table.
@@ -107,8 +108,8 @@ impl<'a> EdgeTable<'a> {
     ///
     /// Will return [``IndexError``](crate::TskitError::IndexError)
     /// if ``row`` is out of range.
-    pub fn left(&'a self, row: tsk_id_t) -> Result<f64, TskitError> {
-        unsafe_tsk_column_access!(row, 0, self.num_rows(), self.table_.left)
+    pub fn left<E: Into<EdgeId> + Copy>(&'a self, row: E) -> Result<f64, TskitError> {
+        unsafe_tsk_column_access!(row.into().0, 0, self.num_rows(), self.table_.left)
     }
 
     /// Return the ``right`` value from row ``row`` of the table.
@@ -117,15 +118,15 @@ impl<'a> EdgeTable<'a> {
     ///
     /// Will return [``IndexError``](crate::TskitError::IndexError)
     /// if ``row`` is out of range.
-    pub fn right(&'a self, row: tsk_id_t) -> Result<f64, TskitError> {
-        unsafe_tsk_column_access!(row, 0, self.num_rows(), self.table_.right)
+    pub fn right<E: Into<EdgeId> + Copy>(&'a self, row: E) -> Result<f64, TskitError> {
+        unsafe_tsk_column_access!(row.into().0, 0, self.num_rows(), self.table_.right)
     }
 
     pub fn metadata<T: metadata::MetadataRoundtrip>(
         &'a self,
-        row: tsk_id_t,
+        row: EdgeId,
     ) -> Result<Option<T>, TskitError> {
-        let buffer = metadata_to_vector!(self, row)?;
+        let buffer = metadata_to_vector!(self, row.0)?;
         decode_metadata_row!(T, buffer)
     }
 
@@ -145,7 +146,7 @@ impl<'a> EdgeTable<'a> {
     /// # Errors
     ///
     /// [`TskitError::IndexError`] if `r` is out of range.
-    pub fn row(&self, r: tsk_id_t) -> Result<EdgeTableRow, TskitError> {
-        table_row_access!(r, self, make_edge_table_row)
+    pub fn row<E: Into<EdgeId> + Copy>(&self, r: E) -> Result<EdgeTableRow, TskitError> {
+        table_row_access!(r.into().0, self, make_edge_table_row)
     }
 }

src/lib.rs

@@ -187,12 +187,22 @@ pub struct MutationId(tsk_id_t);
 #[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd, std::hash::Hash)]
 pub struct MigrationId(tsk_id_t);
 
+/// An edge ID
+///
+/// This is an integer referring to a row of an [``EdgeTable``].
+///
+/// The features for this type follow the same pattern as for [``NodeId``]
+#[repr(transparent)]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, Ord, PartialOrd, std::hash::Hash)]
+pub struct EdgeId(tsk_id_t);
+
 impl_id_traits!(NodeId);
 impl_id_traits!(IndividualId);
 impl_id_traits!(PopulationId);
 impl_id_traits!(SiteId);
 impl_id_traits!(MutationId);
 impl_id_traits!(MigrationId);
+impl_id_traits!(EdgeId);
 
 // tskit defines this via a type cast
 // in a macro. bindgen thus misses it.

src/table_collection.rs

@@ -20,7 +20,7 @@ use crate::TreeSequenceFlags;
 use crate::TskReturnValue;
 use crate::TskitTypeAccess;
 use crate::{tsk_flags_t, tsk_id_t, tsk_size_t, TSK_NULL};
-use crate::{IndividualId, MutationId, NodeId, PopulationId, SiteId};
+use crate::{EdgeId, IndividualId, MutationId, NodeId, PopulationId, SiteId};
 use ll_bindings::tsk_table_collection_free;
 
 /// A table collection.
@@ -172,7 +172,7 @@ impl TableCollection {
         right: f64,
         parent: P,
         child: C,
-    ) -> TskReturnValue {
+    ) -> Result<EdgeId, TskitError> {
         self.add_edge_with_metadata(left, right, parent, child, None)
     }
 
@@ -184,7 +184,7 @@ impl TableCollection {
         parent: P,
         child: C,
         metadata: Option<&dyn MetadataRoundtrip>,
-    ) -> TskReturnValue {
+    ) -> Result<EdgeId, TskitError> {
         let md = EncodedMetadata::new(metadata)?;
         let rv = unsafe {
             ll_bindings::tsk_edge_table_add_row(
@@ -198,7 +198,7 @@ impl TableCollection {
             )
         };
 
-        handle_tsk_return_value!(rv)
+        handle_tsk_return_value!(rv, EdgeId::from(rv))
     }
 
     /// Add a row to the individual table
@@ -440,11 +440,11 @@ impl TableCollection {
     /// If `self.is_indexed()` is `true`, return a non-owning
     /// slice containing the edge insertion order.
     /// Otherwise, return `None`.
-    pub fn edge_insertion_order(&self) -> Option<&[tsk_id_t]> {
+    pub fn edge_insertion_order(&self) -> Option<&[EdgeId]> {
         if self.is_indexed() {
             Some(unsafe {
                 std::slice::from_raw_parts(
-                    (*self.as_ptr()).indexes.edge_insertion_order,
+                    (*self.as_ptr()).indexes.edge_insertion_order as *const EdgeId,
                     (*self.as_ptr()).indexes.num_edges as usize,
                 )
             })
@@ -456,11 +456,11 @@ impl TableCollection {
     /// If `self.is_indexed()` is `true`, return a non-owning
     /// slice containing the edge removal order.
     /// Otherwise, return `None`.
-    pub fn edge_removal_order(&self) -> Option<&[tsk_id_t]> {
+    pub fn edge_removal_order(&self) -> Option<&[EdgeId]> {
         if self.is_indexed() {
             Some(unsafe {
                 std::slice::from_raw_parts(
-                    (*self.as_ptr()).indexes.edge_removal_order,
+                    (*self.as_ptr()).indexes.edge_removal_order as *const EdgeId,
                     (*self.as_ptr()).indexes.num_edges as usize,
                 )
             })
@@ -803,6 +803,41 @@ mod test {
             assert!(*i >= 0);
             assert!(*i < tables.edges().num_rows() as tsk_id_t);
         }
+
+        // The "transparent" casts are such black magic that we
+        // should probably test against what C thinks is going on :)
+        let input = unsafe {
+            std::slice::from_raw_parts(
+                (*tables.as_ptr()).indexes.edge_insertion_order,
+                (*tables.as_ptr()).indexes.num_edges as usize,
+            )
+        };
+
+        assert!(!input.is_empty());
+
+        let tables_input = tables.edge_insertion_order().unwrap();
+
+        assert_eq!(input.len(), tables_input.len());
+
+        for i in 0..input.len() {
+            assert_eq!(EdgeId::from(input[i]), tables_input[i]);
+        }
+
+        let output = unsafe {
+            std::slice::from_raw_parts(
+                (*tables.as_ptr()).indexes.edge_removal_order,
+                (*tables.as_ptr()).indexes.num_edges as usize,
+            )
+        };
+        assert!(!output.is_empty());
+
+        let tables_output = tables.edge_removal_order().unwrap();
+
+        assert_eq!(output.len(), tables_output.len());
+
+        for i in 0..output.len() {
+            assert_eq!(EdgeId::from(output[i]), tables_output[i]);
+        }
     }
 
     #[test]