Argthtjtr

I have a class and i tried to construct this class with Point2D object vector.

        class Polygon{//Polygon.h

            public:

              //-----------POINT CLASS----------

              class Point2D{

              public:

                Point2D(double param_x = 0, double param_y = 0);

                double getX() const;

                double getY() const;

                void setX(double setX);

                void setY(double setY);

              private:

                double x;

                double y;

              };

            Polygon(vector<Polygon::Point2D>& pointVec);

            private:

                int capacity;

                Point2D* points;//For dynamic array

           }



Polygon::Polygon(vector<Polygon::Point2D>& pointVec){//Vector constructor from polygon.cpp

  capacity = pointVec.size();

  points = new Polygon::Point2D[capacity];

  for(int i = 0; i < capacity; i++)

    points[i] = pointVec[i];

}//Vector of 2D points

But when i tried to construct an object of Polygon object with vector of Point2D objects its give me an error like

error: no match for call to '(Polygon) (std::vector<Polygon::Point2D>&)'

    return newPoly(newObj);

up here newPoly is Polygon object and newObj is vector of Point2D objects.

This here where code give error.

const Polygon Polygon::operator +(const Polygon& otherPoly) const{

 vector<Polygon::Point2D> newObj;

 Polygon newPoly;

 if(capacity > otherPoly.getCapacity()){

   for(int i = 0; i < otherPoly.getCapacity(); i++){

     Point2D obj(points[i].getX() + otherPoly[i].getX(), points[i].getY() + otherPoly[i].getY());

     newObj.push_back(obj);

   }

   for(int j = otherPoly.getCapacity() + 1; j < capacity; j++){

     Point2D obj_2(points[j].getX() + otherPoly[j].getX(), points[j].getY() + otherPoly[j].getY());

     newObj.push_back(obj_2);

   }



   return newPoly(newObj);



 } else if(capacity < otherPoly.getCapacity()){

   for(int i = 0; i < capacity; i++){

     Polygon::Point2D obj(points[i].getX() + otherPoly[i].getX(), points[i].getY() + otherPoly[i].getY());

     newObj.push_back(obj);

   }

   for(int j = capacity + 1; j < otherPoly.getCapacity(); j++){

     Polygon::Point2D obj_2(points[j].getX() + otherPoly[j].getX(), points[j].getY() + otherPoly[j].getY());

     newObj.push_back(obj_2);

   }



   return newPoly(newObj);



 } else if(capacity == otherPoly.getCapacity()){

   for(int i = 0; i < capacity; i++){

     Polygon::Point2D obj(points[i].getX() + otherPoly[i].getX(), points[i].getY() + otherPoly[i].getY());

     newObj.push_back(obj);

   }



   return newPoly(newObj);



 }

}

You are calling return newPoly(newObj). This is not calling the Polygon constructor that is taking a vector. This tries to find an operator(std::vector<Point2D>) inside Polygon. If you want to call the constructor you need to return Polygon(newObj); or return Polygon{newObj};.

You have not declared the Polygon(vector<Polygon::Point2D>& pointVec) constructor within the class. Try to add

Polygon(vector<Polygon::Point2D>& pointVec);

Into the Polygon class declaration