error int assumed. Note: C++ does not support default-int

[h4ever]

Can you help me to remove this error?
objects (1).cpp(11): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int

#include "stdafx.h"
using namespace std;

class myClass
{
    public:
       int operator() (int p);
};

myClass::operator()(int p)
{
    cout << "Operator () is called with parameter " << p << endl;
    return p * 2;
}

int main()
{
}

I have no idea what's the problem. I have copied code from one article, and also read article about operators overload but I cannot find where is problem.

[ats15]

You forgot to put an int on line 10

int myClass::operator()(int p)

[h4ever]

ty