// This program demonstrates the for_each find algorithm

#include <iostream>
#include <vector>           // Needed to declare the vector
#include <algorithm>        // Needed for the for_each algorithm
using namespace std;

// Function prototype
void doubleValue(int &);

int main()
{
    vector<int> numbers;
    vector<int>::iterator iter;

    // Store some numbers in the vector.
    for (int x = 0; x < 10; x++)
        numbers.push_back(x);

    // Display the numbers in the vector.
    cout << "The numbers in the vector are:\n";
    for (iter = numbers.begin(); iter != numbers.end(); iter++)
        cout << *iter << " ";
    cout << endl;

    // Double the values in the vector.
    for_each(numbers.begin(), numbers.end(), doubleValue);

    // Display the numbers in the vector again.
    cout << "Now the numbers in the vector are:\n";
    for (iter = numbers.begin(); iter != numbers.end(); iter++)
        cout << *iter << " ";
    cout << endl;

    return 0;
}

//********************************************************
// Function doubleValue. This function accepts an int    *
// reference as its argument. The value of the argument  *
// is doubled.                                           *
//********************************************************
void doubleValue(int &val)
{
	val *= 2;
}