Create a reciprocal function object.

#include <iostream>
#include <list>
#include <functional>
#include <algorithm>
using namespace std;

// A simple function object.
class reciprocal: unary_function<double, double> {
public:
  result_type operator()(argument_type i) { 
    return (result_type) 1.0/i; // return reciprocal
  }
};

int main()
{
  list<double> listObject;
  int i;

  for(i = 1; i <10; i++) 
     listObject.push_back((double)i);

  cout << "Original contents of listObject:\n";
  list<double>::iterator p = listObject.begin();
  while(p != listObject.end()) {
    cout << *p << " ";
    p++;
  }
  cout << endl;
 
  // use reciprocal function object
  // call function object
  p = transform(listObject.begin(), listObject.end(), listObject.begin(), reciprocal()); 

  cout << "Transformed contents of listObject:\n";
  p = listObject.begin();
  while(p != listObject.end()) {
    cout << *p << " ";
    p++;
  }

  return 0;
}

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Create a reciprocal function object. : List « Data Structure « C++

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