unary c

using namespace std;
using namespace __gnu_cxx;

struct one: public unary_function<int, int>
{

    int operator()(int arg)
    {
        return ++arg;
    }
};


int main(int argc, char** argv) {


 one o1,o2;
 int i = 2;

 unary_compose<one,one> func = compose1(o1,o2);

 cout<<func(i)<<endl;


 return (EXIT_SUCCESS);

}