Bitfields

-- Used for saving space
-- NOT portable across platforms
-- bitfield declaration cannot use const and volatile qualifiers
-- Max bit field length is 64 bits. Using more than 32 bits is likely to be non portable

-- CANNOT take the address of a bitfield
-- CANNOT have a pointer to a bitfield
-- CANNOT define an array of bitfields

-- A bitfield of size 0 will force alignment to the nearest word boundary [depends actually on compiler behaviour -- some compilers may pad to the size of the base type...some to the word boundary]

-- A structure containing bitfields is suitably/appropriately padded.