21.5 BinaryFunctionMultiplyRanges.cpp

#include <vector>
#include <iostream>
#include <algorithm>

template <typename elementType>
class Multiply
{
public:
    elementType operator() (const elementType& elem1,
                            const elementType& elem2)
    {
        return(elem1 * elem2);
    }
};

int main()
{
    using namespace std;

   vector<int> vecMultiplicand{ 0, 1, 2, 3, 4 };
   vector<int> vecMultiplier{ 100, 101, 102, 103, 104 };

    // A third container that holds the result of multiplication
    vector<int> vecResult;

    // Make space for the result of the multiplication
    vecResult.resize(vecMultiplier.size());
    transform(vecMultiplicand.begin(), // range of multiplicands
              vecMultiplicand.end(), // end of range
              vecMultiplier.begin(),  // multiplier values
              vecResult.begin(), // range that holds result
              Multiply<int>() );    // the function that multiplies

    cout << "The contents of the first vector are: " << endl;
    for(size_t index = 0; index < vecMultiplicand.size(); ++ index)
        cout << vecMultiplicand [index] << ' ';
    cout << endl;

    cout << "The contents of the second vector are: " << endl;
    for(size_t index = 0; index < vecMultiplier.size(); ++index)
        cout << vecMultiplier [index] << ' ';
    cout << endl;

    cout << "The result of the multiplication is: " << endl;
    for(size_t index = 0; index < vecResult.size(); ++ index)
        cout << vecResult [index] << ' ';

    return 0;
}