I believe it's because you can't && an expression to be used within a static assert. How about the following: ======================== struct attempt_to_invoke_functor_with_incorrect_number_of_arguments : mpl::int_<1> { }; template<typename SEQ, int SIZE> void assertSeqSize() { BOOST_STATIC_ASSERT(( mpl::and_< boost::equal_to<boost::mpl::size<SEQ>::type, boost::mpl::int_<SIZE>

, attempt_to_invoke_functor_with_incorrect_number_of_arguments )); } ======================== HTH Pablo "Stephen Gross" <sgross@darwin.epbi.cwru.edu> wrote in message news:004d01c5a4f4$9cbf10b0$8df51681@sgross...

I'm trying to static assert the value of a sequence. I've got the syntax slightly wrong, but I can't quite figure it out. Here's what my code looks like:

========================== template<typename SEQ, int SIZE> void assertSeqSize() { BOOST_STATIC_ASSERT(( boost::equal_to<boost::mpl::size<SEQ>::type, boost::mpl::int_<SIZE> > )) && "You have attempted to invoke a functor with the incorrect number of Arguments."; } ==========================

[snip]

--Steve

Stephen Gross Case Western School of Medicine Cleveland, OH

"By Grabthar's hammer, by the sons of Worvan, you shall be avenged." - Dr. Lazarus