Extend Programming Project 10.1 from Chapter 10 in which you implemented a two dimensional array class by placing the class definition and implementation in a namespace, then providing access to the names in the namespace. Test your code. To provide access to names in namespaces, you may use local using declarations such as

using std::cout;

or use local using directives such as

using namespace std;

inside a block, or qualify names using the names of namespaces, such as std::cout. You may not use global namespace directives such as the following which are not in a block and apply to the entire file:

using namespace std;