SAMS Teach Yourself C++ in 10 Minutes SECOND EDITION

Making a Library Changes Your Names

Remember the function Initialize(), which was used to prepare cin for throwing exceptions? What if you moved error handling out to a module of its own, and some other library or main program wanted to use that common name? This could be a problem.

You have already seen a way to deal with this possibility: namespaces. That's the solution iostream uses and it will work perfectly for this situation.

The form of a namespace declaration is

namespace namespacename
{
   statements
} ;

Listing 8.3 is the new header file.

Listing 8.3. Header for ErrorHandlingModule

1: #ifndef ErrorHandlingModuleH 2: #define ErrorHandlingModuleH 3: *4: namespace SAMSErrorHandling *5: { 6: void Initialize(void); 7: int HandleNotANumberError(void); ...