Task #1152
Updated by Junxiao Shi about 10 years ago
Define `time::Duration` and `time::Point` types; implement `time::now`. `time::Duration` should be convertible to and from nanoseconds. `time::Point` represents a time point in monotonic clock, and doesn't need to relate with UTC time. These types should support addition, subtraction, and comparison operators. * Point + Duration => Point * Point - Point => Duration * Duration + Duration => Duration * Duration - Duration => Duration * Comparisons should take two operands of same type `time::now()` uses monotonic clock on every platform that supports it, otherwise fallback to wall clock. `time::nowCached()` returns the result from most recent invocation of `time::now()`.