Resolved Help replicating a C++ HFSM / Inheritance example in C#

Hi all, I'm having a go at creating my own Hierarchical Finite State Machine, after reading through the excellent chapter at http://www.gameprogrammingpatterns.com/state.html

Here's the C++ psuedocode:

Code (CSharp):

1. class DuckingState : public OnGroundState
2. {
3. public:
4.   virtual void handleInput(Heroine& heroine, Input input)
5.   {
6.     if (input == RELEASE_DOWN)
7.     {
8.       // Stand up...
9.     }
10.     else
11.     {
12.       // Didn't handle input, so walk up hierarchy.
13.       OnGroundState::handleInput(heroine, input);
14.     }
15.   }
16. };

So I've tried to replicate and tailor to what I need, and have this:

Code (CSharp):

1. public class PlayerIdleState : PlayerGroundedState
2. {
3.     public override void HandleInput(Player player, InputMessage input)
4.     {      
5.         if (input things happen)
6.         {
7.             // do stuff
8.         }
9.         else
10.         {
11.             //do grounded state input handler
12.             PlayerGroundedState.HandleInput(player, input);
13.         }              
14.  
15.     }

However, the eagle eyed amongst you will presumably have noticed, this doesn't work as I'm told I need an instance of the PlayerGroundedState class in order to access the method.

So, I figure I'm either going ot have an instance of each possible state against my player or there's a bit of notation / syntax in C# I'm unaware of to access the parent's similarly-named methods.

Is there an equivalent of that C++ double colon in C#? Or do I need to create instances (static or otherwise) of each state in order to 'walk up' them?

Is it because the base state class is abstract, perhaps it shouldn't be? I'm fumbling in the dark a little here despite trying to read up on this... /shame

Or: how would you fix this?

Any help much appreciated.

 

C# uses the keyword base to access members of the parent. So change line 12 from
PlayerGroundedState.HandleInput(player, input);
to
base.HandleInput(player, input);

 

Thanks @Antistone - I was literally just coming back here to post that I'd got an answer somewhere else

/feelsslightlydumb

 

Please don't be one of those "nvm i figured it out" kind of forum posters who announce they have the solution but dont bother to post it. People will find this thread via the search function or via their search engine and be met with an announcement of your success, but not the solution to your question!

 

What's wrong with the answer already posted right above that?

 

Yeah it appears OP's answer to the problem was the same as antistone's, so no need to repeat it. Like the OP was coming back to post the answer, but saw antistone already posted it.