【高级技巧】Lua位运算模拟：仓库32件裁决之杖压缩成1个数字

local function markSlot(actor, slot)
    local code = getplayvar(actor, "STORE_BIT")
    code = code | (1 << (slot - 1))   -- 5.1 无位运算符，语法报错
    setplayvar(actor, "STORE_BIT", code)
end

local function takeSlot(actor, slot)
    local code = getplayvar(actor, "STORE_BIT") or 0
    local bit = math.floor(code / 2 ^ (slot - 1)) % 2
    if bit == 0 then
        code = code + 2 ^ (slot - 1)
        setplayvar(actor, "STORE_BIT", code)
        sendmsg(actor, 1, "第 " .. slot .. " 格已存入")
    end
end
local function querySlot(actor, slot)
    local code = getplayvar(actor, "STORE_BIT") or 0
    return math.floor(code / 2 ^ (slot - 1)) % 2
end