Clean codes. Remove member function const.

1 files changed, 17 insertions, 12 deletions

diff --git a/include/cru/ui/controls/SingleChildControl.h b/include/cru/ui/controls/SingleChildControl.h
index f748a38d..684b8403 100644
--- a/include/cru/ui/controls/SingleChildControl.h
+++ b/include/cru/ui/controls/SingleChildControl.h
@@ -1,41 +1,46 @@
 #pragma once
 #include "Control.h"
 
+#include <cassert>
+
 namespace cru::ui::controls {
 template <typename TRenderObject>
 class SingleChildControl : public Control {
  protected:
-  SingleChildControl() : container_render_object_(new TRenderObject()) {
-    container_render_object_->SetAttachedControl(this);
+  SingleChildControl(std::string name) : Control(std::move(name)) {
+    container_render_object_.SetAttachedControl(this);
   }
 
  public:
   Control* GetChild() {
-    return GetChildren().empty() ? nullptr : GetChildren().front();
+    const auto& children = GetChildren();
+    assert(children.empty() || children.size() == 1);
+    return children.empty() ? nullptr : children.front();
   }
 
   void SetChild(Control* child) {
-    if (GetChild() == child) return;
-    if (!GetChildren().empty()) {
+    auto old_child = GetChild();
+    if (old_child == child) return;
+    if (old_child) {
       RemoveChildAt(0);
     }
     if (child) {
       InsertChildAt(child, 0);
     }
 
-    container_render_object_->SetChild(
-        child == nullptr ? nullptr : child->GetRenderObject());
+    container_render_object_.SetChild(child ? child->GetRenderObject()
+                                            : nullptr);
   }
 
-  render::RenderObject* GetRenderObject() const override {
-    return container_render_object_.get();
+  render::RenderObject* GetRenderObject() override {
+    return &container_render_object_;
   }
 
-  TRenderObject* GetContainerRenderObject() const {
-    return container_render_object_.get();
+  TRenderObject* GetContainerRenderObject() {
+    return &container_render_object_;
   }
 
  private:
-  std::unique_ptr<TRenderObject> container_render_object_;
+  TRenderObject container_render_object_;
 };
 }  // namespace cru::ui::controls