[Flags]
enum Permissions : uint {
    None = 0,
    Read = 1 << 0,
    Write = 1 << 1,
    Delete = 1 << 2,
    Admin = Read | Write | Delete
}
 
public static class SecurityManager {
    public static bool HasAccess(Permissions userPerms, Permissions required) =>
        (userPerms & required) == required;
 
    public static Permissions Revoke(Permissions current, Permissions toRemove) =>
        current & ~toRemove;
}