diff --git a/src/autorouter/autoroute.rs b/src/autorouter/autoroute.rs
index dc6dfa7..4705a9b 100644
--- a/src/autorouter/autoroute.rs
+++ b/src/autorouter/autoroute.rs
@@ -14,7 +14,7 @@ use crate::{
         AccessMesadata,
     },
     drawing::{band::BandTermsegIndex, graph::PrimitiveIndex, Collect},
-    geometry::primitive::PrimitiveShape,
+    geometry::{edit::Edit, primitive::PrimitiveShape},
     graph::MakeRef,
     layout::LayoutEdit,
     router::{
diff --git a/src/autorouter/invoker.rs b/src/autorouter/invoker.rs
index 850cb01..9eb7474 100644
--- a/src/autorouter/invoker.rs
+++ b/src/autorouter/invoker.rs
@@ -15,7 +15,7 @@ use thiserror::Error;
 use crate::{
     board::AccessMesadata,
     drawing::graph::PrimitiveIndex,
-    geometry::primitive::PrimitiveShape,
+    geometry::{edit::Edit, primitive::PrimitiveShape},
     graph::GenericIndex,
     layout::poly::PolyWeight,
     router::{
diff --git a/src/board/edit.rs b/src/board/edit.rs
index 505bfca..a809392 100644
--- a/src/board/edit.rs
+++ b/src/board/edit.rs
@@ -4,9 +4,7 @@
 
 use std::collections::BTreeMap;
 
-use crate::{drawing::band::BandUid, layout::LayoutEdit};
-
-use super::BandName;
+use crate::{board::BandName, drawing::band::BandUid, geometry::edit::Edit, layout::LayoutEdit};
 
 #[derive(Debug, Clone)]
 pub struct BoardDataEdit {
@@ -21,6 +19,16 @@ impl BoardDataEdit {
     }
 }
 
+impl Edit for BoardDataEdit {
+    fn reverse_inplace(&mut self) {
+        self.bands.reverse_inplace();
+    }
+
+    fn merge(&mut self, edit: Self) {
+        self.bands.merge(edit.bands);
+    }
+}
+
 #[derive(Debug, Clone)]
 pub struct BoardEdit {
     pub data_edit: BoardDataEdit,
@@ -41,22 +49,16 @@ impl BoardEdit {
             layout_edit,
         }
     }
+}
 
-    pub fn reverse_inplace(&mut self) {
-        self.data_edit
-            .bands
-            .values_mut()
-            .for_each(Self::swap_tuple_inplace);
+impl Edit for BoardEdit {
+    fn reverse_inplace(&mut self) {
+        self.data_edit.reverse_inplace();
         self.layout_edit.reverse_inplace();
     }
 
-    fn swap_tuple_inplace<D>(x: &mut (D, D)) {
-        core::mem::swap(&mut x.0, &mut x.1);
-    }
-
-    pub fn reverse(&self) -> Self {
-        let mut rev = self.clone();
-        rev.reverse_inplace();
-        rev
+    fn merge(&mut self, edit: Self) {
+        self.data_edit.merge(edit.data_edit);
+        self.layout_edit.merge(edit.layout_edit);
     }
 }
diff --git a/src/geometry/edit.rs b/src/geometry/edit.rs
index 7abfa56..3091e42 100644
--- a/src/geometry/edit.rs
+++ b/src/geometry/edit.rs
@@ -8,6 +8,21 @@ use crate::graph::{GenericIndex, GetPetgraphIndex};
 
 use super::{AccessBendWeight, AccessDotWeight, AccessSegWeight, GetLayer};
 
+pub trait Edit: Sized {
+    fn reverse(&self) -> Self
+    where
+        Self: Clone,
+    {
+        let mut rev = self.clone();
+        rev.reverse_inplace();
+        rev
+    }
+
+    fn reverse_inplace(&mut self);
+
+    fn merge(&mut self, edit: Self);
+}
+
 pub trait ApplyGeometryEdit<
     DW: AccessDotWeight + GetLayer,
     SW: AccessSegWeight + GetLayer,
@@ -58,50 +73,56 @@ impl<
             compounds: BTreeMap::new(),
         }
     }
+}
 
-    pub fn merge(&mut self, edit: GeometryEdit<DW, SW, BW, CW, Cel, PI, DI, SI, BI>) {
-        Self::merge_btmap(&mut self.dots, &edit.dots);
-        Self::merge_btmap(&mut self.segs, &edit.segs);
-        Self::merge_btmap(&mut self.bends, &edit.bends);
-        Self::merge_btmap(&mut self.compounds, &edit.compounds);
+impl<
+        DW: AccessDotWeight + GetLayer,
+        SW: AccessSegWeight + GetLayer,
+        BW: AccessBendWeight + GetLayer,
+        CW: Clone,
+        Cel: Copy,
+        PI: GetPetgraphIndex + TryInto<DI> + TryInto<SI> + TryInto<BI> + Eq + Ord + Copy,
+        DI: GetPetgraphIndex + Into<PI> + Eq + Ord + Copy,
+        SI: GetPetgraphIndex + Into<PI> + Eq + Ord + Copy,
+        BI: GetPetgraphIndex + Into<PI> + Eq + Ord + Copy,
+    > Edit for GeometryEdit<DW, SW, BW, CW, Cel, PI, DI, SI, BI>
+{
+    fn reverse_inplace(&mut self) {
+        self.dots.reverse_inplace();
+        self.segs.reverse_inplace();
+        self.bends.reverse_inplace();
+        self.compounds.reverse_inplace();
     }
 
-    fn merge_btmap<I: Copy + Eq + Ord, D: Clone>(
-        main: &mut BTreeMap<I, (Option<D>, Option<D>)>,
-        edit: &BTreeMap<I, (Option<D>, Option<D>)>,
-    ) {
+    fn merge(&mut self, edit: Self) {
+        self.dots.merge(edit.dots);
+        self.segs.merge(edit.segs);
+        self.bends.merge(edit.bends);
+        self.compounds.merge(edit.compounds);
+    }
+}
+
+impl<K: Eq + Ord, V> Edit for BTreeMap<K, (Option<V>, Option<V>)> {
+    fn reverse_inplace(&mut self) {
+        self.values_mut()
+            .for_each(|x| core::mem::swap(&mut x.0, &mut x.1));
+    }
+
+    fn merge(&mut self, edit: Self) {
         for (index, (old, new)) in edit {
-            match main.entry(*index) {
+            match self.entry(index) {
                 Entry::Vacant(vac) => {
-                    vac.insert((old.clone(), new.clone()));
+                    vac.insert((old, new));
                 }
-                Entry::Occupied(mut occ) => {
-                    if let ((None, ..), None) = (occ.get(), new) {
+                Entry::Occupied(mut occ) => match (occ.get(), new) {
+                    ((None, _), None) => {
                         occ.remove();
-                    } else {
-                        occ.get_mut().1 = new.clone();
                     }
-                }
+                    (_, new) => {
+                        occ.get_mut().1 = new;
+                    }
+                },
             }
         }
     }
-
-    pub fn reverse_inplace(&mut self) {
-        self.dots.values_mut().for_each(Self::swap_tuple_inplace);
-        self.segs.values_mut().for_each(Self::swap_tuple_inplace);
-        self.bends.values_mut().for_each(Self::swap_tuple_inplace);
-        self.compounds
-            .values_mut()
-            .for_each(Self::swap_tuple_inplace);
-    }
-
-    fn swap_tuple_inplace<D>(x: &mut (D, D)) {
-        core::mem::swap(&mut x.0, &mut x.1);
-    }
-
-    pub fn reverse(&self) -> Self {
-        let mut rev = self.clone();
-        rev.reverse_inplace();
-        rev
-    }
 }