Lua队列类：头尾双指针的工程实现

-- 错误：出队整表搬移，队列越长越卡
function pop()
    return table.remove(data, 1)
end

local q = {_data = {}, _index = 1, _border = 1}
local function push(d)
    q._data[q._border] = d
    q._border = q._border + 1
end
local function pop()
    local ret = nil
    if q._index < q._border then
        ret = q._data[q._index]
        q._data[q._index] = nil
        q._index = q._index + 1
    end
    return ret
end
push("a")
push("b")
local label = panel:getChildByName("qText")
label:setString(tostring(pop() == "a"))