Section 13.1

LRM-115

Change (changes in red and blue):

Semaphores and mailboxes are built-in types, nonetheless, they are classes, and can be used as base classes for deriving additional higher level classes. These Built-in built-in classes reside in the built-in namespace std package (see Section 7.10.1), thus, they can be re-defined by user code in any other scope.