Annex A (informative) Grammar summary [gram]

A.2 Lexical conventions [gram.lex]

hex-quad:
	hexadecimal-digit hexadecimal-digit hexadecimal-digit hexadecimal-digit
universal-character-name:
	\u hex-quad
	\U hex-quad hex-quad
preprocessing-token:
	header-name
	identifier
	pp-number
	character-literal
	user-defined-character-literal
	string-literal
	user-defined-string-literal
	preprocessing-op-or-punc
	each non-white-space character that cannot be one of the above
token:
	identifier
	keyword
	literal
	operator
	punctuator
header-name:
	< h-char-sequence >
	" q-char-sequence "
h-char-sequence:
	h-char
	h-char-sequence h-char
h-char:
	any member of the source character set except new-line and >
q-char-sequence:
	q-char
	q-char-sequence q-char
q-char:
	any member of the source character set except new-line and "
pp-number:
	digit
	. digit
	pp-number digit
	pp-number identifier-nondigit
	pp-number ' digit
	pp-number ' nondigit
	pp-number e sign
	pp-number E sign
	pp-number p sign
	pp-number P sign
	pp-number .
identifier:
	identifier-nondigit
	identifier identifier-nondigit
	identifier digit
identifier-nondigit:
	nondigit
	universal-character-name
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
preprocessing-op-or-punc: one of
	{        }        [        ]        #        ##       (        )
	<:       :>       <%       %>       %:       %:%:     ;        :        ...
	new      delete   ?        ::       .        .*       ->       ->*      ~
	!        +        -        *        /        %        ^        &        |
	=        +=       -=       *=       /=       %=       ^=       &=       |=
	==       !=       <        >        <=       >=       <=>      &&       ||
	<<       >>       <<=      >>=      ++       --       ,
	and      or       xor      not      bitand   bitor    compl
	and_eq   or_eq    xor_eq   not_eq
literal:
	integer-literal
	character-literal
	floating-literal
	string-literal
	boolean-literal
	pointer-literal
	user-defined-literal
integer-literal:
	binary-literal integer-suffix
	octal-literal integer-suffix
	decimal-literal integer-suffix
	hexadecimal-literal integer-suffix
binary-literal:
	0b binary-digit
	0B binary-digit
	binary-literal ' binary-digit
octal-literal:
	0
	octal-literal ' octal-digit
decimal-literal:
	nonzero-digit
	decimal-literal ' digit
hexadecimal-literal:
	hexadecimal-prefix hexadecimal-digit-sequence
binary-digit: one of
	0  1
octal-digit: one of
	0  1  2  3  4  5  6  7
nonzero-digit: one of
	1  2  3  4  5  6  7  8  9
hexadecimal-prefix: one of
	0x  0X
hexadecimal-digit-sequence:
	hexadecimal-digit
	hexadecimal-digit-sequence ' hexadecimal-digit
hexadecimal-digit: one of
	0  1  2  3  4  5  6  7  8  9
	a  b  c  d  e  f
	A  B  C  D  E  F
integer-suffix:
	unsigned-suffix long-suffix 
	unsigned-suffix long-long-suffix 
	long-suffix unsigned-suffix 
	long-long-suffix unsigned-suffix
unsigned-suffix: one of
	u  U
long-suffix: one of
	l  L
long-long-suffix: one of
	ll  LL
character-literal:
	encoding-prefix ' c-char-sequence '
encoding-prefix: one of
	u8  u  U  L
c-char-sequence:
	c-char
	c-char-sequence c-char
c-char:
	any member of the source character set except the single-quote ', backslash \, or new-line character
	escape-sequence
	universal-character-name
escape-sequence:
	simple-escape-sequence
	octal-escape-sequence
	hexadecimal-escape-sequence
simple-escape-sequence: one of
	\'  \"  \?  \\
	\a  \b  \f  \n  \r  \t  \v
octal-escape-sequence:
	\ octal-digit
	\ octal-digit octal-digit
	\ octal-digit octal-digit octal-digit
hexadecimal-escape-sequence:
	\x hexadecimal-digit
	hexadecimal-escape-sequence hexadecimal-digit
floating-literal:
	decimal-floating-literal
	hexadecimal-floating-literal
decimal-floating-literal:
	fractional-constant exponent-part floating-suffix
	digit-sequence exponent-part floating-suffix
hexadecimal-floating-literal:
	hexadecimal-prefix hexadecimal-fractional-constant binary-exponent-part floating-suffix
	hexadecimal-prefix hexadecimal-digit-sequence binary-exponent-part floating-suffix
fractional-constant:
	digit-sequence . digit-sequence
	digit-sequence .
hexadecimal-fractional-constant:
	hexadecimal-digit-sequence . hexadecimal-digit-sequence
	hexadecimal-digit-sequence .
exponent-part:
	e sign digit-sequence
	E sign digit-sequence
binary-exponent-part:
	p sign digit-sequence
	P sign digit-sequence
sign: one of
	+  -
digit-sequence:
	digit
	digit-sequence ' digit
floating-suffix: one of
	f  l  F  L
string-literal:
	encoding-prefix " s-char-sequence "
	encoding-prefix R raw-string
s-char-sequence:
	s-char
	s-char-sequence s-char
s-char:
	any member of the source character set except the double-quote ", backslash \, or new-line character
	escape-sequence
	universal-character-name
raw-string:
	" d-char-sequence ( r-char-sequence ) d-char-sequence "
r-char-sequence:
	r-char
	r-char-sequence r-char
r-char:
	any member of the source character set, except a right parenthesis ) followed by
		the initial d-char-sequence (which may be empty) followed by a double quote ".
d-char-sequence:
	d-char
	d-char-sequence d-char
d-char:
	any member of the basic source character set except:
		space, the left parenthesis (, the right parenthesis ), the backslash \, and the control characters
		representing horizontal tab, vertical tab, form feed, and newline.
boolean-literal:
	false
	true
pointer-literal:
	nullptr
user-defined-literal:
	user-defined-integer-literal
	user-defined-floating-literal
	user-defined-string-literal
	user-defined-character-literal
user-defined-integer-literal:
	decimal-literal ud-suffix
	octal-literal ud-suffix
	hexadecimal-literal ud-suffix
	binary-literal ud-suffix
user-defined-floating-literal:
	fractional-constant exponent-part ud-suffix
	digit-sequence exponent-part ud-suffix
	hexadecimal-prefix hexadecimal-fractional-constant binary-exponent-part ud-suffix
	hexadecimal-prefix hexadecimal-digit-sequence binary-exponent-part ud-suffix
user-defined-string-literal:
	string-literal ud-suffix
user-defined-character-literal:
	character-literal ud-suffix
ud-suffix:
	identifier