Namespaces provide a way to avoid naming conflicts and to group namespace members into a hierarchy. Any code may be contained within a namespace, but only four code constructs are affected: classes, interfaces, functions, and constants.
Creating Namespaces
A construct that is not included in a namespace belongs to the global namespace .
// Global code/namespaceclass MyClass {}
To assign the construct to another namespace, a namespace directive is defined. Any code constructs below the namespace directive belong to that namespace. The naming convention for namespaces is all lowercase.
namespace my;// Belongs ...
