Demonstrating function pointer passing : Functor « Development « C++ Tutorial

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//Revised from
//STL Tutorial and Reference Guide C++ Programming with the Standard Template L
ibrary, 2nd Edition
//by David R. Musser (Author), Atul Saini (Author)
//# Publisher: Addison-Wesley Pub (Sd) (March 1996)
//# Language: English
//# ISBN-10: 0201633981
//# ISBN-13: 978-0201633986


#include <iostream>
#include <cassert>
#include <vector>
using namespace std;

template <typename InputIterator, typename T>
T accumulate1(InputIterator first, InputIterator last, T init, T (*binary_funct
ion)(T x, T y)) // New parameter
{
  while (first != last) {
    init = (*binary_function)(init, *first);
    ++first;
  }
  return init;
}

int multfun(int x, int y) { return x * y; }

int main()
{

  int x[5] = {2, 3, 5, 7, 11};

  vector<int> vector1(&x[0], &x[5]);

  int product = accumulate1(vector1.begin(), vector1.end(), 1, &multfun);

  cout << product << endl;
  return 0;
}

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