From 3c3e707922fd4db3ce907dead2595d994d246d8a Mon Sep 17 00:00:00 2001
From: Eryn Wells <eryn@erynwells.me>
Date: Sat, 9 Aug 2014 20:23:08 -0700
Subject: [PATCH] Light has a shared_ptr type, and an overridable
 Contribution()

---
 src/light.hh | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/light.hh b/src/light.hh
index 241ef33..22d0f2f 100644
--- a/src/light.hh
+++ b/src/light.hh
@@ -6,6 +6,8 @@
 #ifndef __LIGHT_H__
 #define __LIGHT_H__
 
+#include <memory>
+
 #include "basics/basics.hh"
 
 
@@ -13,6 +15,8 @@ namespace charles {
 
 struct Light
 {
+    typedef std::shared_ptr<Light> Ptr;
+
     Light(const basics::Color& color,
           const Double& intensity = 1.0);
 
@@ -23,7 +27,7 @@ struct Light
     Double GetIntensity() const;
     void SetIntensity(const Double& intensity);
 
-    basics::Color&& Contribution() const;
+    virtual basics::Color&& Contribution() const;
 
 private:
     Double ClampIntensity(const Double& intensity);