Hello, I want to use the BOOST_MPL_ASSERT Macro inside a struct (compiler is MSVC2005) #include <boost/mpl/assert.hpp> #include <boost/type_traits.hpp> template<typename Value> struct Getter { typedef std::wstring result_type; BOOST_MPL_ASSERT(( boost::is_fundamental< Value > )); std::wstring operator()(const Value* val)const { return boost::lexical_cast<std::wstring>(*val); } std::wstring operator()(typename boost::call_traits<Value>::const_reference val)const { return boost::lexical_cast<std::wstring>(val); } }; Here I get allways the following error: Error 1 error C2664: 'boost::mpl::assertion_failed' : cannot convert parameter 1 from 'boost::mpl::failed ************boost::is_fundamental<T>::* ***********' to 'boost::mpl::assert<false>::type' Utils.h 32 Error 2 error C2866: 'Microtec::Viewer::Getter<Value>::mpl_assertion_in_line_32' : a const static data member of a managed type must be initialized at the point of declaration Utils.h 32 Inside the function it works fine.. Has anyone an idea how I can solve that? Best regards Hansjörg