fahhh

App/util/ComputeProp.h

@@ -0,0 +1,68 @@
+/* Copyright 2003-2005 ROBLOX Corporation, All Rights Reserved */
+
+#pragma once
+
+//#include "Util/SoundWorld.h"
+#include <string>
+
+
+namespace RBX {
+
+	// A property that computes and caches its value
+	template <class Type, class O>
+	class ComputeProp
+	{
+	private:
+		Type val;
+		bool dirty;
+		O* object;
+		typedef Type (O::*GetFunc)();
+		GetFunc getFunc;
+
+	public:
+		ComputeProp(O* object, GetFunc getFunc) : 
+			dirty(true),
+			object(object),
+			getFunc(getFunc)
+		{}
+		inline Type getValue()
+		{
+			if (dirty) {
+				val = (object->*getFunc)();
+				dirty = false;
+			}
+			return val;
+		}
+		inline Type getLastComputedValue() const
+		{
+			RBXASSERT(!dirty);
+			return val;
+		}
+
+		inline operator Type()
+		{
+			return getValue();
+		}
+		inline Type* getValuePointer()
+		{
+			getValue();
+			return &val;
+		}
+		inline Type& getValueRef()
+		{
+			getValue();
+			return val;
+		}
+		bool setDirty()
+		{
+			bool didSomething = !dirty;
+			dirty = true;
+			return didSomething;
+		}
+		bool getDirty() const
+		{
+			return dirty;
+		}
+	};
+
+}	// namespace RBX