pw::chrono::VirtualClock< SystemClock > Class Reference

#include <system_clock.h>

Inheritance diagram for pw::chrono::VirtualClock< SystemClock >:

Public Member Functions
virtual SystemClock::time_point	now ()=0
	Returns the current time.

Static Public Member Functions
static VirtualClock< SystemClock > &	RealClock ()
	Returns a reference to the real system clock to aid instantiation.

Detailed Description

An abstract interface representing a SystemClock.

This interface allows decoupling code that uses time from the code that creates a point in time. You can use this to your advantage by injecting Clocks into interfaces rather than having implementations call SystemClock::now() directly. However, this comes at a cost of a vtable per implementation and more importantly passing and maintaining references to the VirtualClock for all of the users.

The VirtualSystemClock::RealClock() function returns a reference to the real global SystemClock.

Example:

void DoFoo(VirtualSystemClock& system_clock) {
  SystemClock::time_point now = clock.now();
  // ... Code which consumes now.
}
 
// Production code:
DoFoo(VirtualSystemCLock::RealClock);
 
// Test code:
MockClock test_clock();
DoFoo(test_clock);

This interface is thread and IRQ safe.

Member Function Documentation

now()

virtual SystemClock::time_point pw::chrono::VirtualClock< SystemClock >::now ( )

pure virtual

Returns the current time.

Implemented in pw::async::HeapDispatcher, pw::async::BasicDispatcher, and pw::chrono::SimulatedSystemClock.

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The documentation for this class was generated from the following file:

• pw_chrono/public/pw_chrono/system_clock.h