Re: Some basic question about OOP in Exception class

My be you can define a base class exception as pure virtual and derive
other exceptions from this base class.

// exception.h file
#ifndef EXCEPTION_H
#define EXCEPTION_H

#include <glibmm.h>
#include <gtkmm/messagedialog.h>

class Exception {
public:
        virtual Exception(Glib::ustring s) = 0;
        virtual void DisplayError() = 0;

protected:
        virtual Glib::ustring getErrorMessage() = 0;

};

class SystemException : public Exception {
public:
        Exception(Glib::ustring s) { error_message = s};
        virtual void DisplayError() { ... dialog(..., "System
error", ...); ... }

protected:
        Glib::ustring getErrorMessage() {return error_message}
private:
        Glib::ustring error_message;
};

class ApplicationException : public Exception {
public:
        Exception(Glib::ustring s) { error_message = s};
        virtual void DisplayError() { ... dialog(..., "Application
error", ...); ... }

protected:
        Glib::ustring getErrorMessage() {return error_message}

private:
        Glib::ustring error_message;

};

#endif