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9.2.2 Identifiers

An IDENTIFIER_NODE represents a slightly more general concept that the standard C or C++ concept of identifier. In particular, an IDENTIFIER_NODE may contain a `$', or other extraordinary characters.

There are never two distinct IDENTIFIER_NODEs representing the same identifier. Therefore, you may use pointer equality to compare IDENTIFIER_NODEs, rather than using a routine like strcmp.

You can use the following macros to access identifiers:

The string represented by the identifier, represented as a char*. This string is always NUL-terminated, and contains no embedded NUL characters.
The length of the string returned by IDENTIFIER_POINTER, not including the trailing NUL. This value of IDENTIFIER_LENGTH (x) is always the same as strlen (IDENTIFIER_POINTER (x)).
This predicate holds if the identifier represents the name of an overloaded operator. In this case, you should not depend on the contents of either the IDENTIFIER_POINTER or the IDENTIFIER_LENGTH.
This predicate holds if the identifier represents the name of a user-defined conversion operator. In this case, the TREE_TYPE of the IDENTIFIER_NODE holds the type to which the conversion operator converts.