this API parse_check(const string arg) not work

[darkchooselight]

my example code is follow:
’‘’
cmdline::parser parser;
parser.add("loglevel", 'l', "0-critical, 1-err, 2-warn, 3-info, 4-debug, 5-trace", false, 1);
parser.parse_check("--loglevel");
auto t = parser.get("loglevel");
std::cout << "level:" << t << std::endl; // when set loglevel 5, but it always default value effect
auto log_level = (LogLevel)t;
std::cout << "log level: " << log_level <<std::endl;
InitLog(log_level);
testing::InitGoogleTest(&argc, argv);
return RUN_ALL_TESTS();
‘’‘

I built a bin as "test", when I execute the command "./test --gtest_filter=*.test1 --loglevel 5",
but the loglevel is always set to be default value 1

please check this problem, thx