Logical parameter in parent constructor

I needed to check the parameter from the child's constructor before being sent to the parent. So far I've done this:

Code:

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CListBox::CListBox(std::string name, SDL_Surface *screen, CTTFont* theFont,
        Sint16 xx, Sint16 yy, Sint16 width,
        Uint8 ROptColor, Uint8 GOptColor, Uint8 BOptColor, //option text color
        Uint8 RColor, Uint8 GColor, Uint8 BColor, //button color
        Uint8 RArrowColor, Uint8 GArrowColor, Uint8 BArrowColor) //arrow color
 : CGUI_Object(name, screen, GUI_LISTBOX,
        xx,yy,width, 24,
        (RColor-0x33>RColor ? 0x00:RColor-0x33),(GColor-0x33>GColor ? 0x00:GColor-0x33),(BColor-0x33>BColor ? 0x00:BColor-0x33))

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But that code didn't work. FYI, the parameters were unsigned chars so I needed to check whether the parameters can become negative or not. If it can, it will be inputed as zero in the parent class.

The question is it possible to include a logical expression in a parent's constructor? If it is, how do I do it?

Thanks.

RColor-0x33>RColor is always false
do you mean

RColor-0x33>0

?

Quote:

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Originally Posted by vart

RColor-0x33>RColor is always false
do you mean

RColor-0x33>0

?

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Actually yes. But because the parameters are unsigned, "RColor-0x33>0 " will always be true even if it was supposed to be false because RColor (and other parameters) can't become negative.

then you need to check smthng like

(RColor > 0x33) ? RColor - 0x33 : 0

Quote:

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Originally Posted by vart

then you need to check smthng like

(RColor > 0x33) ? RColor - 0x33 : 0

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Right, why didn't I think of that? Such an elementary mistake and yet I didn't realized it. Thanks.