Nothing stands out to me. Polymorphic.... hmm... I don't do anything of the sort in my example.

Doesn't really explain why the warning is there does it.

So that readers can follow along... here's extended_type_info_typeid.hpp line 88:

// get the eti record for the true type of this record
// relying upon standard type info implemenation (rtti)
const extended_type_info *
get_derived_extended_type_info(const T & t) const {
    // note: this implementation - based on usage of typeid (rtti)
    // only does something if the class has at least one virtual function.
    BOOST_STATIC_WARNING(boost::is_polymorphic<T>::value);
    return
        detail::extended_type_info_typeid_0::get_extended_type_info(
            typeid(t)
        );

----- Original Message -----

Sent: Tuesday, March 09, 2010 12:41 AM

Subject: Re: [Boost-users] [Serialization] Strange giant warning

1>d:\dev\boostpro\boost\boost_1_40\boost\serialization\extended_type_info_typeid.hpp(88) : warning C4099: 'boost::serialization::static_warning_impl<false>::STATIC_WARNING' : type name first seen using 'struct' now seen using 'class'

Take a look at extended_type_info_typeid.hpp line 88.