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Function templates
Templates example from a Well House Consultants training course
More on Templates [link]

This example is described in the following article(s):
   • Templates in C++ - defining a family pattern of methods / functions - [link]

Source code: template.cpp Module: C238
using namespace std;
#include <iostream>

Function templates are a way of defining a whole
family of functions which are essentially the
same except that they work on different types

// Define the template

template<typename T>
 void exchange(T& x, T& y)
   T tmp = x;
   x = y;
   y = tmp;

// Write some code to make use of the template

int main () {

        int x = 6;
        int y = 12;

        char *left = "To the West";
        char *right = "To the East";


        cout << "x is now " << x << endl;
        cout << "y is now " << y << endl;

        cout << "left is now " << left << endl;
        cout << "right is now " << right << endl;

/* Sample Output

munchkin:ac grahamellis$ g++ -o template template.cpp
munchkin:ac grahamellis$ ./template
x is now 12
y is now 6
left is now To the East
right is now To the West
munchkin:ac grahamellis$


Learn about this subject
This module and example are covered on the following public courses:
 * Learning to program in C and C++
 * C++ for C Programmers
 * C and C++ Programming
 * Learning to program in C and C++
 * C and C++ Programming
Also available on on site courses for larger groups

Books covering this topic
Yes. We have over 700 books in our library. Books covering C and C++ are listed here and when you've selected a relevant book we'll link you on to Amazon to order.

Other Examples
This example comes from our "Templates" training module. You'll find a description of the topic and some other closely related examples on the "Templates" module index page.

Full description of the source code
You can learn more about this example on the training courses listed on this page, on which you'll be given a full set of training notes.

Many other training modules are available for download (for limited use) from our download centre under an Open Training Notes License.

Other resources
• Our Solutions centre provides a number of longer technical articles.
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The Horse's mouth provides a daily tip or thought.
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