Summary

Shifts a number left

Prototype

n = bit.shl (num, bits)

Description

This takes two arguments. The first is converted to signed 'long long' (64-bit integer), the second to unsigned 'long long' (64-bit unsigned integer). The first argument is shifted left the number of bits in the second argument.

You can use this for signed or unsigned numbers, as the sign bit will still be preserved.

eg.

print (bit.shl (4, 6)) --> 256

See Also ...

Lua functions

bit.ashr - Shifts a number right, preserving sign
bit.band - Bitwise 'and'
bit.bor - Bitwise 'or'
bit.clear - Clears one or more bits
bit.mod - Bitwise 'modulus' (remainder after integer divide)
bit.neg - Bitwise 'negate' (ones complement)
bit.shr - Shifts a number right
bit.test - Bitwise 'test'
bit.tonumber - Convert a string into a number
bit.tostring - Convert a number into a string
bit.xor - Bitwise 'exclusive or'

Topics

Lua base functions
Lua bc (big number) functions
Lua bit manipulation functions
Lua coroutine functions
Lua debug functions
Lua io functions
Lua LPEG library
Lua math functions
Lua os functions
Lua package functions
Lua PCRE regular expression functions
Lua script extensions
Lua string functions
Lua syntax
Lua table functions
Lua utilities
Scripting
Scripting callbacks - plugins

(Help topic: lua=bit.shl)