64-Bit Bitfield Cheat Sheet

Just as a cheat sheet for me, a 64-Bit Bitfield in Dec and Hex.

Checking if a bit is set:

// AND: Only return 1 if both bits are 1
// 0011 & 0100 = 0000
// 0111 & 0100 = 0100
isSet = (value & 0x4) == 0x4;
isSet = (value & 0x4) > 0;

Setting a bit:

// OR: If either operand is 1, return 1.
// 0011 | 0100 = 0111
newvalue = oldvalue | 0x4; // |=

Unsetting a bit:

// NOT: Invert the Bits
// ~0100 = 1011
// AND: Return 1 if both bits are 1
// 0011 & 1011 = 0011
// 0111 & 1011 = 0011
newvalue = oldvalue & (~0x4) // &= ~0x4;

Toggling a bit:

// XOR: If both bits are equal, return 0
// 0111 ^ 0100 = 0011
// 0011 ^ 0100 = 0111
newvalue = oldvalue ^ 0x4; // ^=