id summary reporter owner description type status milestone component version severity resolution keywords cc 5214 Fixing duration conversion restrictions for VC9 David Deakins viboes The enable_if restrictions for implicit duration conversions in duration.hpp are currently ifdef'd out for VC9 since they cause a compiler error. I have slightly refactored the expression in a way that appears to resolve the VC9 compiler error and should be unlikely to introduce new issues. The patch is attached. Patches closed Boost 1.47.0 chrono Boost Development Trunk Problem fixed