Please add to boost/type_traits/intrinsics.hpp the following slice: ---------------------------- #if defined(__DMC__) && (__DMC__ >= 0x848) // For Digital Mars C++, www.digitalmars.com # define BOOST_IS_UNION(T) (__typeinfo(T) & 0x400) # define BOOST_IS_POD(T) (__typeinfo(T) & 0x800) # define BOOST_IS_EMPTY(T) (__typeinfo(T) & 0x1000) # define BOOST_HAS_TRIVIAL_CONSTRUCTOR(T) (__typeinfo(T) & 0x10) # define BOOST_HAS_TRIVIAL_COPY(T) (__typeinfo(T) & 0x20) # define BOOST_HAS_TRIVIAL_ASSIGN(T) (__typeinfo(T) & 0x40) # define BOOST_HAS_TRIVIAL_DESTRUCTOR(T) (__typeinfo(T) & 0x8) # define BOOST_HAS_NOTHROW_CONSTRUCTOR(T) (__typeinfo(T) & 0x80) # define BOOST_HAS_NOTHROW_COPY(T) (__typeinfo(T) & 0x100) # define BOOST_HAS_NOTHROW_ASSIGN(T) (__typeinfo(T) & 0x200) # define BOOST_HAS_VIRTUAL_DESTRUCTOR(T) (__typeinfo(T) & 0x4) # define BOOST_HAS_TYPE_TRAITS_INTRINSICS #endif ----------------------------- which will enable better boost support for Digital Mars C++. Thanks! -Walter Bright Digital Mars