// C++11 std::function test
// g++ -std=c++0x std_function.cpp
#include <iostream>
#include <functional>

using namespace std;


int square(int x){
  cout<<"square\n";
  return x*x;  
}
int cube(int x){
  cout<<"cube\n";
  return x*x*x;  
}


int test1(function<int(int)> f, int x){  
  return f(x);
}
int test2(function<int(int)> f, int x){  
  return f(f(x));
}
    

int main()
{
  function<int (int)> g;
  for (int i=0;i<10;++i) {
    if(i<4){
      g = square;
    }
    else {
      g = cube;
    }    
    cout<<i<<" ";
    cout<<test1(g,i)<<endl;;
    cout<<test2(g,i)<<endl;;
  }
}