Usually, a struct-declarator is just a declarator for a member of a structure
or union. A structure member may also consist of a specified number of bits.
Such a member is also called a bit-field; its length is set off from the
declarator for the field name by a colon.
struct-declarator:
declarator declaratoropt : constant-expression
This is the declaration that actually is not handled:
#pragma pack(1)
typedef union _byteBool {
struct {
unsigned int b0:1;
unsigned int b1:1;
unsigned int b2:1;
unsigned int b3:1;
unsigned int b4:1;
unsigned int b5:1;
unsigned int b6:1;
unsigned int b7:1;
} bit;
unsigned char val;
} byteBool;
source http://en.wikipedia.org/wiki/C_syntax
Bit fields
C also provides a special type of structure member known as a bit field, which
is an integer with an explicitly specified number of bits. A bit field is
declared as a structure member of type int, signed int, unsigned int, or _Bool,
following the member name by a colon (:) and the number of bits it should
occupy. The total number of bits in a single bit field must not exceed the
total number of bits in its declared type.
As a special exception to the usual C syntax rules, it is
implementation-defined whether a bit field declared as type int, without
specifying signed or unsigned, is signed or unsigned. Thus, it is recommended
to explicitly specify signed or unsigned on all structure members for
portability.
Empty entries consisting of just a colon followed by a number of bits are also
allowed; these indicate padding.
The members of bit fields do not have addresses, and as such cannot be used
with the address-of (&) unary operator. The sizeof operator may not be applied
to bit fields.
The following declaration declares a new structure type known as f and an
instance of it known as g. Comments provide a description of each of the
members:
Original issue reported on code.google.com by ozlbi...@gmail.com on 31 Jan 2012 at 7:10
Original issue reported on code.google.com by
ozlbi...@gmail.comon 31 Jan 2012 at 7:10