使用成员初始值设定项列表没有匹配的函数调用错误

Question

I have 2 classes : point and droite .

Header file for Point:

class point
{
    int abs,ord;
    public:
        point(int,int);
        ~point();

};

cpp file for Point

point::point(int a,int b):abs(a),ord(b)
{
    cout<<"++ constructor point "<<abs<<"  "<<ord<<endl;
}

point::~point()
{
    cout<<"-- destruction abs= "<<abs<<"et ord= "<<ord<<endl;
}

Header file for Droite:

class droite: public point{

    point s1;
    point s2;
    public:
        droite(int,int,int,int);
        ~droite();

};

cpp file for Droite

droite::droite(int a,int b,int c,int d):s1(a,b),s2(c,d)
{
    cout<<"++ constructor of droite "<<a<<""<<b<<""<<c<<""<<d<<endl;
}

droite::~droite(){ cout<<"destructor of droite "<<endl;}

And main

int main(){
    droite A(1,2,3,4);
}

The ouput is :

droite.cpp|12| error: no matching function for call to 'point::point()'

My question is: why am I getting this error while there's a constructor with arguments for point?

Answer 1

There seems to be no good reason why you define droite as being derived from point , and then have two point members of droite . However, if you do need this derivation, then you will need an explicit call to the base class ( point ) constructor with the two int arguments in your definition of the driote constructor:

droite::droite(int a, int b, int c, int d) : point(0,0), s1(a, b), s2(c, d)
{
    cout << "++ constructor of droite " << a << "" << b << "" << c << "" << d << endl;
}

Answer 2

This looks like a syntax error. I'm not sure why you are redeclaring public point in your droite header file.

class droite: public point{

    point s1;
    point s2;
    public:
        droite(int,int,int,int);
        ~droite();

};