Gawain Bolton 1a95e81043 Add time_duration helper functions: (#113) ...

1. is_positive()
  - Return boolean value to indicate whether or not time duration is
    positive.
2. is_zero()
  - Return boolean value to indicate whether or not time duration is
    zero.
3. abs()
  - Return a time_duration which is the absolute value of time
    duration.

Added documentation for these helper functions and improved existing
documentation to indicate constness, return values or static
functions.

2019-11-01 04:08:45 -07:00

11 KiB

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