The Chrono library in the sandbox is now more-or-less feature complete. In addition to the C++0x features, timers have been added to replace the old Boost.Timer library which will become deprecated. The feature list includes: * The C++0x Standard Library's time utilities, including: o Class template duration o Class template time_point o Clocks: + |system_clock| + |monotonic_clock| + |high_resolution_clock| * Class template |timer|, with typedefs: o |system_timer| o |monotonic_timer| o |high_resolution_timer| * Process clocks and timers: o |process_clock|, capturing real, user-CPU, and system-CPU times. o |process_timer|, capturing elapsed real, user-CPU, and system-CPU times. o |run_timer|, convenient reporting of |process_timer| results. * The C++0x Standard Library's compile-time rational arithmetic. See http://svn.boost.org/svn/boost/sandbox/chrono The implementation is now working and lightly tested on Windows with VC++ 9.0 SP1 and Intel ia32 11.0 compilers, and on Ubuntu Linux with GCC 4.2.4 compiler. There is a bit more documentation, but it is still needs much work. Comments are welcome. --Beman