std::locale::category

This member type describes a category of facets.

It is an enum-like type accepting bitmask combinations of any of the following member constant values:

category	facets
locale::collate	collate
locale::ctype	ctype, codecvt
locale::monetary	moneypunct, money_get, money_put
locale::numeric	numpunct, num_get, num_put
locale::time	time_get, time_put
locale::messages	messages
locale::all	(all of the above)