Is there a type trait that defines both is_arithmetic and is_enum together? (not is_scalar though)

I find I'm doing this often:

BOOST_STATIC_ASSERT(boost::is_arithmetic<Integer>::value == true || boost::is_enum<Integer>::value == true);

which lead me to wondering if there was a more granular trait which included the two

Nope. But you could easily write your own - it's not the intention of type traits to provide every possible combination ;-) HTH, John.