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kdelibs'LengthBox (./kdelibs/khtml/rendering/render_style.h:128)

struct LengthBox
{
    LengthBox()
    {
	left = Length(0, Undefined);
	right = Length(0, Undefined);
	top = Length(0, Undefined);
	bottom = Length(0, Undefined);
    }

    Length left;
    Length right;
    Length top;
    Length bottom;
    Length& operator=(Length& len)
    {
    	left=len;
	right=len;
	top=len;
	bottom=len;
	return len;
    }

    bool operator==(const LengthBox& o) const
    {
    	return left==o.left && right==o.right && top==o.top && bottom==o.bottom;
    }


    bool nonZero() const { return left.value!=0 || right.value!=0 || top.value!=0 || bottom.value!=0; }
};