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RedMew/utils/queue.lua
2019-01-04 15:02:16 -05:00

34 lines
539 B
Lua

local Queue = {}
function Queue.new()
local queue = {_head = 0, _tail = 0}
return queue
end
function Queue.size(queue)
return queue._tail - queue._head
end
function Queue.push(queue, element)
local index = queue._head
queue[index] = element
queue._head = index - 1
end
function Queue.peek(queue)
return queue[queue._tail]
end
function Queue.pop(queue)
local index = queue._tail
local element = queue[index]
queue[index] = nil
queue._tail = index - 1
return element
end
return Queue