C++ (Qt)
#include <iostream>
#include <cstdio>
#include <vector>
using namespace std;
 
class Coord
{
private:
    int x, y;
public:
    Coord(){x = 0; y = 0;}
    Coord(int _x, int _y){x = _x; y = _y;}
    Coord(const Coord &c){x = c.x;}
    ~Coord(){cout << "Delete Coord[" << x << ',' << y << "]" << endl;}
    Coord &operator=(const Coord &c);
    bool operator <(const Coord &c) const;
    friend ostream &operator <<(ostream& s, const Coord &c);
};
 
Coord &Coord::operator =(const Coord &c)
{
    if(this == &c)return *this;
    else
    {
        this->x = c.x;
        this->y = c.y;
        return *this;
    }
}
 
bool Coord::operator <(const Coord &c)const
{
    if(this->x < c.x)return true;
    else if(this->x == c.x)
    {
        if(this->y < c.y)return true;
    }
    return false;
}
 
ostream &operator <<(ostream& s, const Coord &c)
{
    cout << "Coord[" << c.x << "," << c.y << "]" << endl;
    return s;
}
 
int main()
{
    vector<Coord> v;
    v.push_back(Coord());
    v.push_back(Coord());
    v.push_back(Coord());
    cout << v[0];
    cout << v[1];
    cout << v[2];
 
    getchar();
    return 0;
}
 

Delete Coord[0,0]
Delete Coord[0,11665604]
Delete Coord[0,0]
Delete Coord[0,11665604]
Delete Coord[0,825111086]
Delete Coord[0,0]
Coord[0,11669608]
Coord[0,2037603443]
Coord[0,1127952947]

Coord[0,11669608]
Coord[0,2037603443]
Coord[0,1127952947]

C++ (Qt)
Coord(const Coord &c){x = c.x;}