Lemings, Eric B. writes:

MPL currently contains type trait metafunctions for is_sequence and is_placeholder.

FWIW, some argue that 'is_sequence' is ill-conceived because it promotes interfaces that don't work well in generic contexts -- see, for instance, http://thread.gmane.org/gmane.comp.lib.boost.devel/111645.

Shouldn't it also contain is_integral_c for checking integral constant wrappers?

If you have a valid use case for it, sure ;). Could you provide some more context? -- Aleksey Gurtovoy MetaCommunications Engineering