>From: "Paul Mensonides" <[EMAIL PROTECTED]>
> From: "Daniel Frey" <[EMAIL PROTECTED]>
>
> > On Thu, 09 Jan 2003 20:18:08 +0100, Derek Ross wrote:
> >
> > > Daniel Frey wrote:
> > >> Uhm... don't know about MPL, but isn't this a good example for
> > >> type_traits? Something like:
> > >>
> > >> template <class T>
> > >> bool SetOption(COptionInfo& o, const char* key, const T& value) {
> > >> BOOST_STATIC_ASSERT( boost::is_same< T, bool >::value ||
> > >> boost::is_same< T, int >::value ||
> > >> boost::is_same< T, double >::value ||
> > >> boost::is_same< T, std::string
>::value );
> > >> ...etc...
> > >
> > > It doesn't compile because the commas in the is_same template confuse
> > > the macro preprocessor.
> > >
> > > The error message is:
> > >
> > > "macro "BOOST_STATIC_ASSERT" passed 5 arguments, but takes just 1"
>
> You can just do this as well:
>
> BOOST_STATIC_ASSERT(
> ( boost::is_same<T, bool>::value ) ||
> ( boost::is_same<T, int>::value ) ||
> ( boost::is_same<T, double>::value ) ||
> ( boost::is_same<T, std::string>::value );
> )
>
> In other words, just parenthesize the expressions.
Or even just the macro parameter:
BOOST_STATIC_ASSERT((\
boost::is_same<T, bool>::value ||\
boost::is_same<T, int>::value ||\
boost::is_same<T, double>::value ||\
boost::is_same<T, std::string>::value ));
Regards,
Terje
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