Problem constructing a class with a nested struc

I am trying to pass a nested struct type as an argument for the class constructor, and use an initializer list to invoke the implicit copy constructor for the struct to do all the work. But it's somehow not working.

This is my header file

Code:

---

#ifndef _OBJECT_HPP_
#define _OBJECT_HPP_

class Object
{
public:

        // Nested structure to represent a point and its corresponding operations
        struct Point {
                float x, y;

                // Struct constructor
                Point ( float X = 0, float Y = 0 );

                // Way to set the point
                void Set ( float X, float Y );

                // The origin
                static const Point ORIGIN;
        };
       
        // Constructor
        Object ( const Point & center );

        // Function for viewing and setting the center of the object
        Point & Center ();

        // Function for returning the area, a pure virtual function
        virtual float Area() const = 0;

        // Drawing function
        virtual void Draw ();
       
        // Destructor
        virtual ~Object();


private:
        Point center;
};
#endif

---

and this is my implementation of the class

Code:

---

#include "Object.hpp"

const Object::Point Object::Point::ORIGIN = Object::Point();

// Point constructor
Object::Point::Point ( float X, float Y )
{
        x = 0;
        y = 0;
}

// Set function
void Object::Point::Set ( float X, float Y)
{
        x = X;
        y = Y;
}

// Object constructor (default and non-default)
// Use implicit copy constructor
Object::Object ( const Point & center ) : Point(center)
{
}

// Function for returning the area, a pure virtual function
float Object::Area() const
{
}

// Drawing function
void Object::Draw ()
{
}
       
// Destructor
Object::~Object()
{
}

---

The red part is where I am having problem, when I tried to compile I got this message

Code:

---

error C2436: 'Point' : member function or nested class in constructor initializer list

---

Does a struct come with a default copy constructor or do I need to define it separately?
Please advice, thanks.

1st there is no Point object in the global scope to pass to object constructor, you would have to do Object::Object ( const Object::Point & center ) : Point(center), However Point is not a member variable, it is a type so you need to do this:

Code:

---

Object::Object ( const Object::Point & Center ) : center(Center) // I capitalize the C so you could differentiate
{
...
}

---

One last note: you really need to name you variables better, a suggest for the member variable would be to prefix an m like m_center, m_x, m_y, especially when you want to reuse them in functions and contructors of your class.

The problem is that you're using the name of the struct in the initializer list instead of the name of an object. Instead of Point(center) which implies you want to instantiate a temporary Point object passing center as an arg, you should say center(c) // using c instead of "center" as the constructor's argument.

I figured out the problem, but thanks you all for the advice :D