A list of macros that can be used to carry out bit manipulation

bitmanipulation.cpp

//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//
//                     Bit manipulation macros                        //
//~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~//

//Extract bytes from integers, floats & doubles
#define Lo(param) ((char *)&param)[0] //0x000y
#define Hi(param) ((char *)&param)[1] //0x00y0
#define Higher(param) ((char *)&param)[2] //0x0y00
#define Highest(param) ((char *)&param)[3] //0xy000

//Extract nibbles from integers, floats & doubles
#define Low(param) ((int *)&param)[0] //0x00yy
#define Top(param) ((int *)&param)[1] //0xyy00

// Set bit and clear bit
// x -> byte, y -> bit
#define setBit(x, y) x |= (1 << y)
#define clearBit(x, y) x &= ~(1 << y)
#define toggleBit(x, y) x ^= (1 << y)

// Query to see if bit is set or cleared.
// x -> byte, y -> bit
#define bitIsSet(x, y) x & (1 << y)
#define bitIsClear(x, y) !(x & (1 << y))

//Set nibbles
// x -> byte, y -> value to set
#define setLowerNibble(x, y) x &= 0xF0; x |= (y & 0x0F) // Clear out the lower nibble // OR in the desired mask
#define setUpperNibble(x, y) x &= 0x0F; x |= (y & 0xF0) // Clear out the lower nibble // OR in the desired mask