Casting pointers

[Deewiant]

Henning Hasemann wrote:
> FYI the construct was something like this (note that I'm too lazy to
> work out the correct casting again, I'll just show the basic idea):
> 
> class MainLoop {
>   IRenderable*[] renderables;
>   // render the renderables in a method
> }
> 
> class UserInterface : IRenderable {
> }
> 
> class Scene : IRenderable {
> }
> 
> UserInterface globalUserInterface;
> Scene currentScene;
> 
> MainLoop mainLoop;
> mainLoop.renderables ~= &globalUserInterface;
> mainLoop.renderables ~= &currentScene;
> 
> // some time later:
> currentScene = someOtherScene;
> // and/or:
> globalUserInterface = specialUserInterfaceForMiniGame;
>  

The thing about D is that interfaces and classes are already reference types.
IRenderable* here is equivalent to IRenderable** in C++. For your code above,
using just IRenderable would have worked just fine.

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