In the fourth installment of our series on cross-platform GUI programming with the Qt C++ toolkit, we are going to write a custom widget using Qt. The widget in question is a "scribble" widget (see Figure 1) - that is, the drawing area of a simple paint program

In this article I will visit the mechanics of namespaces and anonymous namespaces and explain how they are used to solve some of the problems associated with linking C++ programs. Then I will move on to explain how they can also be used to provide context.

Part 3 - An Example Using Foundation