问题
I'm implemeting this diamond inheritance:
class Object {
private:
int id; string name;
public:
Object(){};
Object(int i, string n){name = n; id = i;};
};
class Button: virtual public Object {
private:
string type1;
int x_coord, y_coord;
public:
Button():Object(){};
Button(int i, string n, string ty, int x, int y):Object(i, n){
type = ty;
x_coord = x;
y_coord = y;};
};
class Action: virtual public Object {
private:
string type2;
public:
Action():Object(){};
Action(int i, string n, string t):Object(i, n){ type2 = t;};
};
class ActionButton: public Button, public Action{
private:
bool active;
public:
ActionButton():Buton(), Action(){};
ActionButton(int i, string n, string t1, int x, int y, string t2, bool a):
Button(i, n, t1, x, y), Action(i, n, t2) {active = a;};
};
Everything works fine about the first three classes, but when I try to create an object of the type ActionButton, instead of calling the constructor with the parameters I wrote, it is calling the default one from the class Object. So every ButtonAction object has name an empty string and id a random value. What's wrong with my code and how can i make it work properly?
回答1:
Virtual bases are constructed directly by the constructor of the most derived class.
Your ActionButton constructor doesn't explicitly call Object's constructor, so the default constructor is called for you.
来源：https://stackoverflow.com/questions/38104855/inheritance-wrong-call-of-constructors