Basic type: unknown & void

Variables
const type_t	BT_UNK = 0x00
	unknown
const type_t	BT_VOID = 0x01
	void
const type_t	BTMT_SIZE0 = 0x00
	BT_VOID - normal void; BT_UNK - don't use
const type_t	BTMT_SIZE12 = 0x10
	size = 1 byte if BT_VOID; 2 if BT_UNK
const type_t	BTMT_SIZE48 = 0x20
	size = 4 bytes if BT_VOID; 8 if BT_UNK
const type_t	BTMT_SIZE128 = 0x30
	size = 16 bytes if BT_VOID; unknown if BT_UNK (IN struct alignment - see below)

Detailed Description

BT_UNK and BT_VOID with non-zero type flags can be used in function (and struct) declarations to describe the function arguments or structure fields if only their size is known. They may be used in ida to describe the user input.

In general BT_... bits should not be used alone to describe types. Use BTF_... constants instead.

For struct used also as 'single-field-alignment-suffix' [__declspec(align(x))] with TYPE_MODIF_MASK == TYPE_FULL_MASK.