Add support for uint type enum, Fix #379

[UlyssesWu]

This PR fixes #379 .

By using, referring or merging this pull request, you understand and agree that the copyright or patent license of this pull request and its code will not be granted to Tencent.

[tencent-adm]

Thank you for your submission, we really appreciate it. Like many open source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution.
_{You have signed the CLA already but the status is still pending? Let us recheck it.}