Here is a list of all enum values with links to the classes they belong to:

ITEM_CLEARFLAG : umem_env_item
ITEM_FLAG : umem_env_item
ITEM_INVALID : umem_env_item
ITEM_OPTSIZE : umem_env_item
ITEM_OPTUINT : umem_env_item
ITEM_SIZE : umem_env_item
ITEM_SPECIAL : umem_env_item
ITEM_UINT : umem_env_item