Use shared_ptr for Scene::mCamera

Makes memory management a bit easier...

src/camera.h

@@ -10,11 +10,15 @@
 #ifndef __CAMERA_H__
 #define __CAMERA_H__
 
+#include <memory>
+
 #include "basics.h"
 
 
 struct Camera
 {
+    typedef std::shared_ptr<Camera> Ptr;
+
     Camera();
     Camera(const Camera& other);
     virtual ~Camera();

src/scene.cc

@@ -31,10 +31,7 @@ Scene::Scene()
 
 Scene::~Scene()
 {
-    if (mCamera) {
-        delete mCamera;
-        mCamera = NULL;
-    }
+    mCamera.reset();
 
     if (ambient != NULL) {
         delete ambient;
@@ -81,7 +78,10 @@ Scene::get_height()
 }
 
 
-Camera*
+/*
+ * Scene::GetCamera --
+ */
+Camera::Ptr
 Scene::GetCamera()
     const
 {
@@ -89,10 +89,13 @@ Scene::GetCamera()
 }
 
 
+/*
+ * Scene::SetCamera --
+ */
 void
 Scene::SetCamera(Camera* camera)
 {
-    mCamera = camera;
+    mCamera.reset(camera);
 }
 
 

src/scene.h

@@ -36,8 +36,9 @@ public:
     int get_height() const;
     void set_height(int h) { height = h; }
 
-    Camera* GetCamera() const;
+    Camera::Ptr GetCamera() const;
     void SetCamera(Camera* camera);
+    void SetCamera(Camera::Ptr camera);
 
     AmbientLight &get_ambient() const;
     const Color *get_pixels() const;
@@ -55,7 +56,7 @@ private:
     // Pixel dimensions of the image.
     int width, height;
 
-    Camera *mCamera;
+    Camera::Ptr mCamera;
 
     /*
      * Ray tracing parameters. max_depth indicates the maximum depth of the ray tree. min_weight indicates the minimum