Lua栈实现队列：双栈协作的先进先出

local inStack, outStack = {}, {}
local function enqueue(v)
    inStack[#inStack + 1] = v
end
local function dequeue()
    if #outStack == 0 then
        while #inStack > 0 do
            outStack[#outStack + 1] =
                inStack[#inStack]
            inStack[#inStack] = nil
        end
    end
    local v = outStack[#outStack]
    outStack[#outStack] = nil
    return v
end

enqueue(1); enqueue(2); enqueue(3)
local p = getplayerbyname("stackq01")
sendmsg(p, 1, "出队 " .. dequeue())
enqueue(4)
sendmsg(p, 1, "出队 " .. dequeue())