I think the current Boost version (1.59.0_2) is quite old, and needs an upgrade (current version is 1.61.0). There are quite a few improvements in the new version, and I actually have to install Boost 1.61 manually now. I have never contributed to Boost, should/could I do anything? Best regards, Yongwei -- Yongwei Wu URL: http://wyw.dcweb.cn/