Use custom function and for_each to calculate mean value : for_each « STL Algorithms Non modifying sequence operations « C++ Tutorial

/* The following code example is taken from the book
 * "The C++ Standard Library - A Tutorial and Reference"
 * by Nicolai M. Josuttis, Addison-Wesley, 1999
 * (C) Copyright Nicolai M. Josuttis 1999.
 * Permission to copy, use, modify, sell and distribute this software
 * is granted provided this copyright notice appears in all copies.
 * This software is provided "as is" without express or implied
 * warranty, and with no claim as to its suitability for any purpose.

#include <iostream>
#include <vector>
#include <deque>
#include <list>
#include <set>
#include <map>
#include <string>
#include <algorithm>
#include <iterator>
#include <functional>
#include <numeric>

 * - prints optional C-string optcstr followed by
 * - all elements of the collection coll
 * - separated by spaces
template <class T>
inline void PRINT_ELEMENTS (const T& coll, const char* optcstr="")
    typename T::const_iterator pos;

    std::cout << optcstr;
    for (pos=coll.begin(); pos!=coll.end(); ++pos) {
        std::cout << *pos << ' ';
    std::cout << std::endl;

/* INSERT_ELEMENTS (collection, first, last)
 * - fill values from first to last into the collection
 * - NOTE: NO half-open range
template <class T>
inline void INSERT_ELEMENTS (T& coll, int first, int last)
    for (int i=first; i<=last; ++i) {

using namespace std;

// function object to process the mean value
class MeanValue {
    long num;    // number of elements
    long sum;    // sum of all element values
    // constructor
    MeanValue () : num(0), sum(0) {

    // function call
    // - process one more element of the sequence
    void operator() (int elem) {
        num++;          // increment count
        sum += elem;    // add value

    // return mean value (implicit type conversion)
    operator double() {
        return static_cast<double>(sum) / static_cast<double>(num);

int main()
    vector<int> coll;


    // process and print mean value
    double mv = for_each (coll.begin(), coll.end(),  // range
                          MeanValue());              // operation
    cout << "mean value: " << mv << endl;
mean value: 4.5

25.11.1.Use for_each with predicate
25.11.2.Use for_each function to add value for each element
25.11.3.Use for_each function to add first element to each element in the list
25.11.4.Use for_each function to print all elements in a vector
25.11.5.Call custom function in for_each
25.11.6.Use custom function and for_each to calculate mean value
25.11.7.Use for_each() algorithm to show elements in a vector and do the summation
25.11.8.Using for_each to Display the Contents of a Collection
25.11.9.The square of every integer in a vector