lst-0024-book.cpp
// https://godbolt.org/z/WTWxYa3rd
class Widget {
unsigned x = 0, y = 0, w = 0, h = 0; // for example
public:
unsigned getLeft() const;
unsigned getTop() const;
unsigned getRight() const;
unsigned getBottom() const;
void setWidth(unsigned w);
void setHeight(unsigned h);
};