// How to use bind to
// a) change the order of arguments 
// b) turn a 3 argument function to a 2 argument function
// 
#include<iostream>
#include <functional>
void  f(const double & x,const double & y,const double & z)
{
  std::cout<<"called f with arguments "<<x<<" "<<y<<" "<<z<<std::endl;
}
int main()
{
  using namespace std::placeholders;  // for _1, _2
  f(1.1,2.2,3.3);
  // a) change the order of arguments with bind:
  auto invf=std::bind(f,_3,_2,_1);   // bind return type is std::function 
  invf(1.1,2.2,3.3);
  // b) create a two-argument function from f
  auto g=std::bind(f,_1,_2, 333.3); // bind 3rd argument to fixed value 333.3
  g(10.1,20.2);   
}