In section 2.4 the C++ Standard defines a preprocessing token as one of :

header-name
identifier
pp-number
character-literal
string-literal
preprocessing-op-or-punc
each non-whitespace character that cannot be one of the above

Can someone explain and/or give examples of the last item :
"each non-whitespace character that cannot be one of the above".

TIA
Jeff Higgins


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Hello,

> In section 2.4 the C++ Standard defines a preprocessing token as one of :
> [...]
> each non-whitespace character that cannot be one of the above
>
> Can someone explain and/or give examples of the last item :
> "each non-whitespace character that cannot be one of the above".

This covers e.g. characters like '$' which do not have any standard
meaning in C++ (i.e. they are not part of any token). But IIRC, two
single quotation marks ('') without any characters in between also fall
into this category, because this cannot be a valid character-literal. So
each quotation mark is a "non-whitespace character that cannot be one of
the above".

Regards,
   Christoph

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