Annex A (informative) Grammar summary [gram]

A.14 Preprocessing directives [gram.cpp]

preprocessing-file:
	groupopt

group:
	group-part
	group group-part

group-part:
	control-line
	if-section
	text-line
	# conditionally-supported-directive

control-line:
	# include		pp-tokens new-line
	# define		identifier replacement-list new-line
	# define		identifier lparen identifier-listopt ) replacement-list new-line
	# define		identifier lparen ... ) replacement-list new-line
	# define		identifier lparen identifier-list , ... ) replacement-list new-line
	# undef		identifier new-line
	# line		pp-tokens new-line
	# error		pp-tokensopt new-line
	# pragma		pp-tokensopt new-line
	# new-line

if-section:
	if-group elif-groupsopt else-groupopt endif-line

if-group:
	# if		constant-expression new-line groupopt
	# ifdef		identifier new-line groupopt
	# ifndef		identifier new-line groupopt

elif-groups:
	elif-group
	elif-groups elif-group

elif-group:
	# elif		constant-expression new-line groupopt

else-group:
	# else		new-line groupopt

endif-line:
	# endif		new-line

text-line:
	pp-tokensopt new-line

conditionally-supported-directive:
	pp-tokens new-line

lparen:
	a ( character not immediately preceded by white-space

identifier-list:
	identifier
	identifier-list , identifier

replacement-list:
	pp-tokensopt

pp-tokens:
	preprocessing-token
	pp-tokens preprocessing-token

new-line:
	the new-line character

defined-macro-expression:
	defined identifier
	defined ( identifier )

h-preprocessing-token:
	any preprocessing-token other than >

h-pp-tokens:
	h-preprocessing-token
	h-pp-tokens h-preprocessing-token

has-include-expression:
	__has_­include ( < h-char-sequence > )
	__has_­include ( " q-char-sequence " )
	__has_­include (   string-literal  )
	__has_­include ( < h-pp-tokens     > )