If, in the replacement list, a parameter is immediately
preceded by a
#
preprocessing token,
both are replaced by a single character string literal preprocessing token that
contains the spelling of the preprocessing token sequence for the
corresponding argument (excluding placemarker tokens)
.Let the
stringizing argument be the preprocessing token sequence
for the corresponding argument with placemarker tokens removed
.Each occurrence of whitespace between the stringizing argument's preprocessing
tokens becomes a single space character in the character string literal
.Whitespace before the first preprocessing token and after the last
preprocessing token comprising the stringizing argument is deleted
.Otherwise, the original spelling of each preprocessing token in the
stringizing argument is retained in the character string literal,
except for special handling for producing the spelling of
s,
string-literals,
and
character-literals:
a
\ character is inserted before each
" and
\ character of a
,
character-literal,
or
string-literal
(including the delimiting
" characters)
.If the replacement that results is not a valid character string literal,
the behavior is undefined
.The character string literal corresponding to
an empty stringizing argument is
"".The order of evaluation of
#
and
##
operators is unspecified
.