【Lua实战】位运算标志位：多状态开关的位存储实现

local FLAG = { signed = 1, married = 2, vip = 4, verified = 8 }
local function setFlag(actor, flag)
    local player = class(actor)
    local bits = tonumber(getplayvar(actor, 2, "FLAG_BITS") or "0")
    setplayvar(actor, "HUMAN", "FLAG_BITS", bits | flag, 1)
end
local function clearFlag(actor, flag)
    local player = class(actor)
    local bits = tonumber(getplayvar(actor, 2, "FLAG_BITS") or "0")
    setplayvar(actor, "HUMAN", "FLAG_BITS", bits & ~flag, 1)
end
local function hasFlag(actor, flag)
    local player = class(actor)
    local bits = tonumber(getplayvar(actor, 2, "FLAG_BITS") or "0")
    return bits & flag ~= 0
end

local function canEnterAdvanced(actor)
    local player = class(actor)
    local need = FLAG.vip | FLAG.verified
    local bits = tonumber(getplayvar(actor, 2, "FLAG_BITS") or "0")
    return bits & need == need
    end