Add `UpdateSolid`

crates/fj-kernel/src/operations/mod.rs

@@ -12,5 +12,7 @@ pub use self::{
     },
     insert::{Insert, IsInserted, IsInsertedNo, IsInsertedYes},
     join::JoinCycle,
-    update::{UpdateCycle, UpdateFace, UpdateHalfEdge, UpdateShell},
+    update::{
+        UpdateCycle, UpdateFace, UpdateHalfEdge, UpdateShell, UpdateSolid,
+    },
 };

crates/fj-kernel/src/operations/update/mod.rs

@@ -2,8 +2,9 @@ mod cycle;
 mod edge;
 mod face;
 mod shell;
+mod solid;
 
 pub use self::{
     cycle::UpdateCycle, edge::UpdateHalfEdge, face::UpdateFace,
-    shell::UpdateShell,
+    shell::UpdateShell, solid::UpdateSolid,
 };

crates/fj-kernel/src/operations/update/solid.rs

@@ -0,0 +1,17 @@
+use crate::{
+    objects::{Shell, Solid},
+    storage::Handle,
+};
+
+/// Update a [`Solid`]
+pub trait UpdateSolid {
+    /// Add a shell to the solid
+    fn add_shell(&self, shell: Handle<Shell>) -> Solid;
+}
+
+impl UpdateSolid for Solid {
+    fn add_shell(&self, shell: Handle<Shell>) -> Solid {
+        let shells = self.shells().cloned().chain([shell]);
+        Solid::new(shells)
+    }
+}