【Lua实战】位运算状态包：64 个开关压进一个数字

local function pack(flags)
    local v = 0
    for i = 1, #flags do
        if flags[i] then
            v = v + 2 ^ (i - 1)
        end
    end
    return math.floor(v)
end
local function unpack(v, idx)
    return math.floor(v / 2 ^ (idx - 1)) % 2 == 1
end

local SWITCH = { "DOUBLE_EXP", "SIEGE", "BLACK_MARKET", "ESCORT", "LOTTERY", "SMELT_UP", "GHOST_BONUS", "ANNIV" }
function setSwitch(actor, name, on)
    local v = tonumber(getplayvar(actor, "HUMAN", "SWITCH_PKG") or "0")
    for i, s in ipairs(SWITCH) do
        if s == name then
            local cur = unpack(v, i)
            if on and not cur then v = v + 2 ^ (i - 1) end
            if not on and cur then v = v - 2 ^ (i - 1) end
        end
    end
    setplayvar(actor, "HUMAN", "SWITCH_PKG", math.floor(v), 1)
end