C++ concepts: TrivialClock
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                    The TrivialClock concept describes the requirements satisfied by all the clocks in the chrono library.
[edit] Requirements
For a type TC:
-  The type must meet Clockrequirements.
-  The types TC::rep, TC::duration, and TC::time_point satisfy the requirements of EqualityComparable,LessThanComparable,DefaultConstructible,CopyConstructible,CopyAssignable,Destructible, andNumericType.
-  lvalues of the types TC::rep, TC::duration, and TC::time_point are Swappable.
- The function TC::now() does not throw exceptions.
-  The type TC::time_point::clock meets the TrivialClockrequirements, recursively.
[edit] Usage
The following types satisfy this concept in the standard library:


