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C-/C++-Quelltext

class UiControl
{
private:
    UiControl()
    {
        //The constructor UiControl is private, only objects of subclasses can be created
    }

public:
    int x;
    int y;
    
    int width;
    int height;

    enum TypeTag { BUTTON, TEXT_FIELD };
    TypeTag typeTag;
};

class Button : public UiControl
{
public:
    this->typeTag; //Fehler: this->typeTag existiert nicht
};

C-/C++-Quelltext

class Button : public UiControl
{
public:
    UiControl::typeTag = BUTTON; //error: this declaration has no storage class or type specifier.
};

C-/C++-Quelltext

class UiControl
{
protected:
    UiControl()
    {
        //The constructor UiControl is protected, only objects of subclasses can be created
    }

public:
    int x;
    int y;
    
    int width;
    int height;

    enum TypeTag { BUTTON, TEXT_FIELD };
    TypeTag typeTag;
};

class Button : public UiControl
{
public:
    string caption;

    Button()
    {
        this->typeTag = BUTTON;
    }
};