Cannot declare inherited class of virtual Base

This is a discussion on Cannot declare inherited class of virtual Base within the C++ Programming forums, part of the General Programming Boards category; Anybody see what is going wrong here? i am compiling using codeblocks, when i try to make the ResetState class ...

  1. #1
    Registered User rogster001's Avatar
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    Cannot declare inherited class of virtual Base

    Anybody see what is going wrong here? i am compiling using codeblocks, when i try to make the ResetState class inherit from the StateEngine class i get error

    "expected unqualified-id before "public"
    |
    ||=== Build finished: 1 errors, 0 warnings ===|

    other classes are working fine as inherited, and the project has been built ok,
    its only when i add the text to make resetstate inherit that the problem occurs
    i have cleaned and done rebuild also.

    i cant see what i am doing wrong,
    below is the base class, resetstate class and resetstate constructor

    Base Class in header Globals.h >

    Code:
    #ifndef GLOBALS_H_INCLUDED
    #define GLOBALS_H_INCLUDED
    
    #include <SDL/SDL_events.h>
    #include <SDL/SDL_image.h>
    
    extern SDL_Surface* screen;              
    extern SDL_Surface* temp;
    extern SDL_Event event;                  
    
    class StateEngine                               //Base class
    {
        public:
        virtual void HandleEvents() = 0;
        virtual void Do_Logic() = 0;
        virtual void Render() = 0;
        virtual ~StateEngine(){};
    };
    
    
    #endif // GLOBALS_H_INCLUDED
    ResetState Class in header reset.h >

    Code:
    #ifndef RESET_H_INCLUDED
    #define RESET_H_INCLUDED
    
    #include <SDL/SDL.h>
    #include <SDL/SDL_events.h>
    #include <SDL/SDL_image.h>
    #include "Constants.h"
    #include "Globals.h"
    
    class ResetState public : StateEngine
    {
        private:
    
        SDL_Surface* Resetsourcemsg; 
        SDL_Surface* Buttonsource;  
        SDL_Rect resetmsg;
        SDL_Rect resetclip;
        SDL_Rect optionbutton[2];
        SDL_Rect optionclip[2];
    
        int count;
        int anim_count;
        int testX, testY;
    
        public:
    
        void HandleEvents();
        void Do_Logic();
        void Render();
    
        ResetState();
        ~ResetState();
    
    };
    
    #endif // RESET_H_INCLUDED
    The Constructor for ResetState in source file of same name >

    Code:
    #include <SDL/SDL.h>
    #include <SDL/SDL_events.h>
    #include <SDL/SDL_image.h>
    #include "Utilities.h"
    #include "Constants.h"
    #include "Globals.h"
    #include "reset.h"
    
    ResetState::ResetState()
    {
        temp = NULL;                            //this is global
        Resetsourcemsg = NULL;
        Buttonsource = NULL;
    
        temp = SDL_LoadBMP("Gameinfo.bmp");
        Resetsourcemsg = SDL_DisplayFormat(temp);
        SDL_FreeSurface(temp);
    
        temp = SDL_LoadBMP("Buttonsheet.bmp");
        Buttonsource = SDL_DisplayFormat(temp);
        SDL_FreeSurface(temp);
    
        testX = 0, testY = 0;
        anim_count = 0;
    
        resetmsg.x = 330;            //the reset game yes/no? message box
        resetmsg.y = 580;
        resetmsg.w = 500;
        resetmsg.h = 100;
    
     //for the sake of brevity i have removed the rest of the constructor, it just 
     // initialises the remaining SDL_Rect objects as in above resetmsg.x = etc.
    
    }
    Last edited by rogster001; 12-17-2009 at 07:56 AM.

  2. #2
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    colon's on the wrong side of public.

  3. #3
    Registered User rogster001's Avatar
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    haha, god i love it ...thing is now that threw another error 'expected class name before '{' token, think that is something to do ith my includes though, i will have to check, cheers

  4. #4
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    Your includes? Maybe try the:

    #include "SDL_events.h"

  5. #5
    Registered User rogster001's Avatar
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    Your includes? Maybe try the:

    #include "SDL_events.h"
    Yea ok, that was added unneeded, nevertheless the include problem was adding reset.h to the globals header, copy paste mania, but now anybody for a bit of >

    Undefined reference to vtable for ResetState
    ??
    I see this a a bit of an FAQ elswhere and am looking up any advice but any answers appreciated

  6. #6
    Registered User rogster001's Avatar
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    well i think its because i have not yet compiled the files that would provide at least one implementation of the virtual functions, they are in the project so doing that now and sure will solve, guaranteed to fail after saying that of course.

  7. #7
    Registered User rogster001's Avatar
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    done!!!!!!!!

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