IsWallClockSource Concept Reference

Concept for wall-clock time sources (and sinks, if they support persisting time). More...

#include <wall_clock_source.hh>

Concept definition

template<typename T>
concept IsWallClockSource =
  requires(T v, TimeoutArgument t, clock_t c, int i) {

Clock sources must expose whether they support setting the time.

      { T::SupportsTimeSetting } -> std::same_as<const bool &>;

Clock sources must expose whether they are cheap enough to call every time a user asks for the clock to be updated or only after there is some reasonable possibility of clock drift.

      { T::IsCheap } -> std::same_as<const bool &>;
 

Clock sources must provide a mechanism to get a matching pair of monotonic and wall-clock time and a priority.

This returns 0 on success.

      { v.get_time(t, c, c, i) } -> std::same_as<int>;
  } &&
  ((T::SupportsTimeSetting == true) &&
     requires(T v) {
         {
             v.set_time(std::declval<TimeoutArgument>, std::declval<clock_t &>)
         } -> std::same_as<int>;
     } ||
   requires { !T::SupportsTimeSetting; })

Detailed Description

Concept for wall-clock time sources (and sinks, if they support persisting time).

Definition at line 12 of file wall_clock_source.hh.