WayVR: Minor refactoring (#203)

Use iterators instead of closures.

src/backend/wayvr/handle.rs

@@ -48,7 +48,6 @@ macro_rules! gen_id {
         }
 
         //ThingVec
-        #[allow(dead_code, clippy::iter_not_returning_iterator)]
         impl $container_name {
             pub const fn new() -> Self {
                 Self {
@@ -57,25 +56,27 @@ macro_rules! gen_id {
                 }
             }
 
-            pub fn iter(&self, callback: &dyn Fn($handle_name, &$instance_name)) {
-                for (idx, opt_cell) in self.vec.iter().enumerate() {
-                    if let Some(cell) = opt_cell {
+            pub fn iter(&self) -> impl Iterator<Item = ($handle_name, &$instance_name)> {
+                self.vec.iter().enumerate().filter_map(|(idx, opt_cell)| {
+                    opt_cell.as_ref().map(|cell| {
                         let handle = $container_name::get_handle(&cell, idx);
-                        callback(handle, &cell.obj);
-                    }
-                }
+                        (handle, &cell.obj)
+                    })
+                })
             }
 
             pub fn iter_mut(
                 &mut self,
-                callback: &mut dyn FnMut($handle_name, &mut $instance_name),
-            ) {
-                for (idx, opt_cell) in self.vec.iter_mut().enumerate() {
-                    if let Some(cell) = opt_cell {
-                        let handle = $container_name::get_handle(&cell, idx);
-                        callback(handle, &mut cell.obj);
-                    }
-                }
+            ) -> impl Iterator<Item = ($handle_name, &mut $instance_name)> {
+                self.vec
+                    .iter_mut()
+                    .enumerate()
+                    .filter_map(|(idx, opt_cell)| {
+                        opt_cell.as_mut().map(|cell| {
+                            let handle = $container_name::get_handle(&cell, idx);
+                            (handle, &mut cell.obj)
+                        })
+                    })
             }
 
             pub const fn get_handle(cell: &$cell_name, idx: usize) -> $handle_name {

src/backend/wayvr/mod.rs

@@ -311,7 +311,7 @@ impl WayVR {
         });
 
         // Check for redraw events
-        self.state.displays.iter_mut(&mut |_, disp| {
+        for (_, disp) in self.state.displays.iter_mut() {
             for disp_window in &disp.displayed_windows {
                 if self
                     .state
@@ -322,17 +322,17 @@ impl WayVR {
                     disp.wants_redraw = true;
                 }
             }
-        });
+        }
 
         // Tick all child processes
         let mut to_remove: SmallVec<[(process::ProcessHandle, display::DisplayHandle); 2]> =
             SmallVec::new();
 
-        self.state.processes.iter_mut(&mut |handle, process| {
+        for (handle, process) in self.state.processes.iter_mut() {
             if !process.is_running() {
                 to_remove.push((handle, process.display_handle()));
             }
-        });
+        }
 
         for (p_handle, disp_handle) in &to_remove {
             self.state.processes.remove(p_handle);
@@ -345,9 +345,9 @@ impl WayVR {
             }
         }
 
-        self.state.displays.iter_mut(&mut |handle, display| {
+        for (handle, display) in self.state.displays.iter_mut() {
             display.tick(&self.state.config, &handle, &mut self.state.signals);
-        });
+        }
 
         if !to_remove.is_empty() {
             self.state.signals.send(WayVRSignal::BroadcastStateChanged(
@@ -591,11 +591,11 @@ impl WayVRState {
 
         let mut process_names = Vec::<String>::new();
 
-        self.processes.iter_mut(&mut |_, process| {
+        for (_, process) in self.processes.iter_mut() {
             if process.display_handle() == handle {
                 process_names.push(process.get_name());
             }
-        });
+        }
 
         if !display.displayed_windows.is_empty() || !process_names.is_empty() {
             anyhow::bail!(