Bitwise operations

Operations for bit manipulation.

Overview

Logical operations

and

Computes bitwise AND of two integers.

Signature: (a b -- result)

0b1100 0b1010 and // 0b1000 (8)

or

Computes bitwise OR of two integers.

Signature: (a b -- result)

0b1100 0b1010 or // 0b1110 (14)

xor

Computes bitwise XOR of two integers.

Signature: (a b -- result)

0b1100 0b1010 xor // 0b0110 (6)

not

Computes bitwise NOT (ones' complement).

Signature: (a -- result)

0 not // -1 (all bits set)

Shift operations

<< (shl)

Shifts a left by n bits.

Signature: (a n -- result)

1 4 <<  // 16
1 4 shl // 16 (same as <<)

>> (shr)

Shifts a right by n bits (arithmetic shift).

Signature: (a n -- result)

16 2 >>  // 4
16 2 shr // 4 (same as >>)

Common uses

Setting bits

const FlagRead = 1
const FlagWrite = 2
const FlagExec = 4

// Set flags
FlagRead FlagWrite or -> permissions

Checking bits

permissions FlagRead and 0 != if {
    "Has read permission" print nl
}

Clearing bits

permissions FlagWrite not and -> permissions

Toggling bits

permissions FlagExec xor -> permissions