Hi, I just switched from version 1.43 to 1.44 and now I get the following compilation error boost/detail/sp_typeinfo.hpp(77) : error C2440: 'Initialisierung': 'const char *' kann nicht in 'boost::detail::sp_typeinfo' konvertiert werden (in english: 'const char *' cannot be converted to 'boost::detail::sp_typeinfo') I have BOOST_NO_TYPEID defined and using a MSVC 9 compiler. In version 1.43 the line was: template<class T> sp_typeinfo sp_typeid_< T >::ti_( sp_typeid_< T >::name() ); so, the explicit ctor was called. In version 1.44 it changed to template<class T> sp_typeinfo sp_typeid_< T >::ti_ = sp_typeid_< T >::name(); and the explicit ctor won't be called anymore. The change message (https://svn.boost.org/trac/boost/changeset/62245/trunk/boost/detail/sp_typei...) refers to some fix for Sun C++. IMO the change should better be guarded by some compiler-detection macro. Tobias