Присвоить значение возвращаемое boost::bind

template <typename T> 
class Function
{
private:
    typedef T (*type)();
    type pointer;
public :
    Function(){}
    Function(const type &_pointer)
    {
        this->pointer = _pointer;
    }
    type operator=(const type &_pointer)
    {
        this->pointer = _pointer;
    }
    
    T operator()()
    {
        return this->pointer();
    }
};
 
template <typename T, typename P1> 
class Function< T (P1) >
{
private :
    typedef T (*type)(P1);
    type pointer;
public :
    Function(){}
    Function(const type &_pointer)
    {
        this->pointer = _pointer;
    }
    type operator=(const type &_pointer)
    {
        this->pointer = _pointer;
    }
    
    T operator()(P1 p1)
    {
        return this->pointer(p1);
    }
};
 
 
template <typename T, typename P1, typename P2> 
class Function< T (P1, P2) >
{
private :
    typedef T (*type)(P1, P2);
    type pointer;
public :
    Function(){}
    Function(const type &_pointer)
    {
        this->pointer = _pointer;
    }
    type operator=(const type &_pointer)
    {
        this->pointer = _pointer;
    }
    
    T operator()(P1 p1, P2 p2)
    {
        return this->pointer(p1, p2);
    }
};

int main(int argc, char** argv) 
{
    Function<int> f = &hw1;
    f();
    Function<int (char)> f1 = &hw;
    f1('a');
    int(*f2)(char)  = &hw;
    f2('b');
    //int(*f3)(char) = boost::bind(&hw, 'c');
    //f3();
    return 0;
}

auto f3 = boost::bind(hw, '6');
f3();