identifier:
identifier-nondigit
identifier identifier-nondigit
identifier digit
identifier-nondigit:
nondigit
universal-character-name
other implementation-defined characters
nondigit: one of
a b c d e f g h i j k l m
n o p q r s t u v w x y z
A B C D E F G H I J K L M
N O P Q R S T U V W X Y Z _
digit: one of
0 1 2 3 4 5 6 7 8 9
An identifier is an arbitrarily long sequence of letters and digits. Each universal-character-name in an identifier shall designate a character whose encoding in ISO 10646 falls into one of the ranges specified in [charname.allowed]. The initial element shall not be a universal-character-name designating a character whose encoding falls into one of the ranges specified in [charname.disallowed]. Upper- and lower-case letters are different. All characters are significant.20
The identifiers in Table [tab:identifiers.special] have a special meaning when appearing in a certain context. When referred to in the grammar, these identifiers are used explicitly rather than using the identifier grammar production. Unless otherwise specified, any ambiguity as to whether a given identifier has a special meaning is resolved to interpret the token as a regular identifier.
Table
3— Identifiers with special meaning
In addition, some identifiers are reserved for use by C++ implementations and standard libraries ([global.names]) and shall not be used otherwise; no diagnostic is required.
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