This calls Copy constructor which assigns/copies the data associated with the object b.

class test
{

public:
int x y;

test ();

test(const test&);

test operator (const test&);

virtual ~test();

};

test::test(const test& b)
{

cout << "i am in a copy constructor"<<endl;

}

test::~test()
{

}

test::test()
{

}

test test::operator (const test& b)
{
if (this &b)
return *this;
cout << "i am using assignment operator "<<endl;

x b.x;
y b.y;

return *this;
}



int main()
{

test d;
test b d;
test e(b);
getchar();

return 0;

}