Hi I am learning C++, and trying for object composition.

I have 2 classes: Point and Creature.
Point->int x and int y
Creature:-> Point location and string name

Below is my Point class header

Code:
#ifndef POINT_H
#define POINT_H

class Point
{
    public:
        /** Default constructor */
        Point(int x, int y);

        Point();

        void set_x(int);
        void set_y(int);
        int get_x();
        int get_y();

    protected:

    private:
    int x;
    int y;
};

#endif // POINT_H
Below is my Point class cpp
Code:
#include<iostream>
#include "Point.h"

Point::Point(int t, int h)
{
    x=t;
    y=h;
    //ctor
}
void Point::set_x(int h){
    x=h;
}

void Point::set_y(int h){
    y=h;
}

int Point::get_x(){
    return x;
}

int Point::get_y(){
    return y;
}
My creature header file looks like:
Code:
#ifndef CREATURE_H
#define CREATURE_H
#include "Point.h"
#include <string>

class Creature
{
    public:
        /** Default constructor */
        Creature(Point &location, std::string name);
        /** Access loc
         * \return The current value of loc
         */
        Point Getloc() { return loc; }
        /** Set loc
         * \param val New value to set
         */
        void Setloc(Point &val) { loc = val; }
        /** Access name
         * \return The current value of name
         */
        std::string Getname() { return name; }
        /** Set name
         * \param val New value to set
         */
        void Setname(std::string val) { name = val; }
    protected:
    private:
        Point loc; //!< Member variable "loc"
        std::string name; //!< Member variable "name"
};

#endif // CREATURE_H
My creature cpp looks like this:
Code:
#include "Creature.h"
#include "Point.h"

Creature::Creature(Point &location, std::string n_name)
{
    //ctor

    name=n_name;
    loc=location;

}
I need to have a creature object with its location. The location will be passed as an object of Point.
I am getting error
undefined reference to 'Point::Point()'
at line:
Code:
Creature::Creature(Point &location, std::string n_name)
I am sure there is some mistake in passing reference, which I cannot figure it out.