#include <boost/convert.hpp>

template <typename T>
struct point
{
    T x, y;
};

template <typename T>
std::ostream &operator<<(std::ostream &os, point<T> const & p)
{
    os << "(" << p.x << "," << p.y << ")";
    return os;
}

template <typename T>
std::istream &operator>>(std::istream &is, point<T> & p)
{
    char c = 0;
    is >> c;
    if( c != '(')
    {
        is.setstate(std::ios_base::failbit);
        return is;
    }
    is >> p.x;
    is >> c;
    if( c != ',')
    {
        is.setstate(std::ios_base::failbit);
        return is;
    }
    
    is >> p.y;
    is >> c;
    if( c != ')')
    {
        is.setstate(std::ios_base::failbit);
        return is;
    }

    return is;
}

template <typename T>
point<T> operator+(point<T> const & lhs, point<T> const & rhs)
{
    point<T> p = {lhs.x + rhs.x, rhs.y + rhs.y};
    return p;
}

int main()
{
    point<int> p1 = {1, 2};
    point<int> p2 = {3, 4};
    point<int> p3 = {0, 0};

    p3 = p2 + p1;

    p1 = boost::convert<point<int> >::from("(1,2)");
    p1 = boost::convert<point<int> >::from("(3,4)");

    point<int> p4 = boost::convert<point<int> >::from("(1,2)") + boost::convert<point<int> >::from("(3,4)");
}