error: expected class-name before '{' token, inheritance help

This is a discussion on error: expected class-name before '{' token, inheritance help within the C++ Programming forums, part of the General Programming Boards category; Hey, I tried to search and found a little, but it was not enough to help me. I am getting ...

  1. #1
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    error: expected class-name before '{' token, inheritance help

    Hey,
    I tried to search and found a little, but it was not enough to help me. I am getting this error:
    Code:
    InputBox.h:8: error: expected class-name before '{' token
    but I'm pretty sure the required class definitions are included.

    here's InputBox implementation and header.

    Header:
    Code:
    #ifndef INPUTBOX_H_
    #define INPUTBOX_H_
    
    //#include <FL/Fl_Input.H>
    //#include "Widget.h"
    
    class InputBox: public Fl_Input, public Widget
    {
    	public:
    		InputBox(int, int, int, int, const char* );
    	private:
    		InputBox();
    };
    #endif /*INPUTBOX_H_*/
    Implementation:
    Code:
    #include <FL/Fl_Input.H>
    #include "Widget.h"
    #include "InputBox.h"
    
    //InputBox::InputBox(){}
    
    InputBox::InputBox(int X, int Y, int W, int H, const char *L): Fl_Input(X, Y, W, H, L)
    {
    	callback(callback_changed, this);
    }
    I get this error if I were to include Widget.h and Fl_Input.H in the InputBox.h file as well. I can't figure it out, please help me if you can. Thank you.

  2. #2
    and the hat of sweating
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    Well they should definitely be included in the header rather than the .cpp file.

    Are Fl_Input and/or Widget in a different namespace?

    Are there any syntax errors in Fl_Input.h or Widget.h?

    If that doesn't help, post those headers and we'll see if there's a problem in them. BTW, try not deriving from one (and don't include the header), then try the other one and see if it's a problem with Fl_Input & Widget or just one of them.

  3. #3
    and the hat of wrongness Salem's Avatar
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    A missing ; at the end of the class in Widget.h perhaps?
    If you dance barefoot on the broken glass of undefined behaviour, you've got to expect the occasional cut.
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  4. #4
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    cpjust:
    I don't think they are in different namespaces, but Fl_widget is from a toolkit called FLTK, so they might be. I am not familiar enough with namespaces to know for sure. There are no syntax errors in either of them, they will compile stand alone. This problem is happening with all of my classes that derive from another class, not matter what class they are deriving from. So i'm not sure what the problem is.

    Salem:
    Widget.h has a ; at the end of the class declaration, but thanks, good thought.

    I cannot figure this out. It seems like they should be working.

  5. #5
    and the hat of sweating
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    Post Widget.h and we'll see if there's anything obvious there.

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