union
, enum
e struct
(e suppongo anche class
) hanno insieme separate "nome secchi" (non ha nulla a che fare con C++ namespace!) Da identificatori ordinari. Questo diventa chiaro in C, perché si deve precedere i nomi con struct
ecc
io non ce l'ho per C++, ma questo è da C di serie:
6.2.3 Name spaces of identifiers
If more than one declaration of a particular identifier is visible at
any point in a translation unit, the syntactic context disambiguates uses
that refer to different entities.
Thus, there are separate name spaces for various categories of identifiers,
as follows:
— label names (disambiguated by the syntax of the label declaration and use);
— the tags of structures, unions, and enumerations (disambiguated by
following any32) of the keywords struct, union, or enum);
— the members of structures or unions; each structure or union has a
separate name space for its members (disambiguated by the type of the
expression used to access themember via the . or -> operator);
— all other identifiers, called ordinary identifiers (declared in ordinary
declarators or as enumeration constants).
Che cosa si intende per 'e x' per la coppia funzione-variabile? – chris