#include <iostream>
#include <sstream>
#include <string>

using namespace std;

class MyTypeA
{
public:
    MyTypeA(int i) : _i(i) {};
    virtual ~MyTypeA() {};

    string getStr() const { return to_string(_i); }

private:
    int _i;
};

class MyTypeB
{
public:
    MyTypeB(int i) : _i(i) {};
    virtual ~MyTypeB() {};

    string getStr() const { return to_string(_i); }

private:
    int _i;
};

class Message : public ostringstream
{
public:
    Message() {};
    virtual ~Message() {};

    Message& operator <<(const MyTypeA &a) {
        return *this << a.getStr();
    };

    Message& operator <<(const MyTypeB &b) {
        return *this << b.getStr();
    };

    template<class T>
    Message& operator <<(const T &t)
    {
        (std::ostringstream&)(*this) << t;
        return *this;
    }
};

int main()
{
    MyTypeA a(10);
    MyTypeA b(-10);

    Message m;
    m << a << "-" << b; // This works just fine!
    m << a << "-" << b << endl; // Ba dumm tss

    return 0;
}