how much memory does this consume...

[sanddune008]

I would like to know how much memory does the following declatations consume?

typedef struct
{
  unsigned int type:2;
  unsigned int Specific:1;
  unsigned int direction:1;
  unsigned int Rsp:1;
  unsigned int reserved:3;
} Control_t;
 
Control_t Control; //What would be the memory consumption for this
 

1. Will the memory consumption be 1 byte? if so how will the bits be assigned?
I mean will the type variable ocupy the 2bits of Least significant position...
2. How will the bits be assigned?

Thanks all in advance

[JosAH]

Two quotes from the C Standard:

A bit-field may have type int , unsigned int , or signed int .
Whether the high-order bit position of a ``plain'' int bit-field is
treated as a sign bit is implementation-defined. A bit-field is
interpreted as an integral type consisting of the specified number of
bits.

An implementation may allocate any addressable storage unit large
enough to hold a bit-field. If enough space remains, a bit-field that
immediately follows another bit-field in a structure shall be packed
into adjacent bits of the same unit. If insufficient space remains,
whether a bit-field that does not fit is put into the next unit or
overlaps adjacent units is implementation-defined. The order of
allocation of bit-fields within a unit (high-order to low-order or
low-order to high-order) is implementation-defined. The alignment of
the addressable storage unit is unspecified.

and another one:

The expression that specifies the width of a bit-field shall be an
integral constant expression that has nonnegative value that shall not
exceed the number of bits in an ordinary object of compatible type.
If the value is zero, the declaration shall have no declarator.

kind regards,

Jos