ISO/IEC 9,899:2011 clause 6.10--preprocessing indicator

6.10 Preprocessing Indicator

Grammar

1,preprocessing-file:

groupopt

Group:

Group-part

Group Group-part

Group-part:

if-section

Control-line

Text-line

# non-directive

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:

# Else New-line

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

text-line:

pp-tokensopt New-line

non-directive:

Pp-tokens New-line

Lparen:

One ( character, no whitespace character immediately before it is placed

replacement-list:

pp-tokensopt

Pp-tokens:

Preprocessing-token

Pp-tokens Preprocessing-token

new-line:

Line break character

Describe

2. A preprocessing indicator consists of a string of preprocessing characters that meet the following constraints: The first token in the sequence is a # preprocessor, (at the beginning of the translation Phase 4) It is either the first character in the source file (optionally, After a white-space character that does not contain newline characters), or after a white-space character that contains at least one line break. The last character in the sequence is the first line-break character following the first token. [Note: Thus, preprocessor indicators are often referred to as "lines.") These "lines" do not have other syntactic meanings, since all whitespace characters are equivalent except in some cases during preprocessing (e.g., the # string literal in 6.10.3.2 creates operators). ] A newline character to terminate the preprocessing indicator, even if it occurs within a call to a macro that resembles a function.

ISO/IEC 9,899:2011 clause 6.10--preprocessing indicator