实现

local tab = {
    new = function()
        print("new is called.")
    end,
    delete = function()
        print("delete is called.")
    end,
}


tab.new()
tab.delete()


function setHiddenProperty(tab, name)
    if not tab[name] then
        return
    end

    if not tab.__hiddenProps then
        tab.__hiddenProps = {}
    end

    local hiddenProps = tab.__hiddenProps

    hiddenProps[name] = tab[name]
    tab[name] = nil
end

function restoreHiddenPorpertys(tab)
    local hiddenProps = tab.__hiddenProps

    if not hiddenProps then
        return
    end

    for k,v in pairs(hiddenProps) do
        tab[k] = v
    end

    tab.__hiddenProps = nil
end


setHiddenProperty(tab, "new")
setHiddenProperty(tab, "delete")

-- this time call new and delete will throw error
--tab.new()
--tab.delete()

restoreHiddenPorpertys(tab)

tab.new()
tab.delete()