Michael Cook  <mcook@cognex.com> wrote:
>Is it legal to have //-style comments within a preprocessor directive?  If so,
>that'd mean C++ compilers would be precluded from using ISO C preprocessors.

That is correct.  Comments are converted into spaces before
preprocessing occurs.  In practice, it is common for a single
preprocessor program to have two modes of operation, one in which //
starts a comment and one in which it does not.  That preprocessor can
then be used for both languages.  (Actually other options are needed
too, controlling which digraphs are recognised.)

-zefram
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