Syntax:

    namespace name {
    declaration-list;
    }

The namespace keyword allows you to create a new scope. The name is optional, and can be omitted to create an unnamed namespace. Once you create a namespace, you'll have to refer to it explicitly or use the using keyword. Example code:

     namespace CartoonNameSpace {
       int HomersAge;
       void incrementHomersAge() {
         HomersAge++;
       }
     }
     int main() {
       ...
       CartoonNameSpace::HomersAge = 39;
       CartoonNameSpace::incrementHomersAge();
       cout << CartoonNameSpace::HomersAge << endl;
       ...
     }

Related Topics: using