title: Custom actions update method in Cocos2dx 2.0
body: <p>In my C++/Cocos2d-x code I have some custom Cocos2d actions; in my case, classes inheriting <code>CCActionInterval</code> or <code>CCActionInstant</code>. I notice a difference between Cocos2d-x version 1.0.1 and version 2.0 in how update methods of these classes are called . Before the upgrade, the update methods were always called at least once with time=1.0. From what I see now, in version 2.0, the update method of the instant actions is called only once with time=0. Is it always so? Can I assume that, in version 2.0, in classes inheriting <code>CCActionInstant</code>, the update method will be called only once and the time value will always be zero?</p>