Add get_system_time_in_ns()

Signed-off-by: Yadunund <[email protected]>

rmw_zenoh_cpp/src/detail/zenoh_utils.cpp

@@ -83,6 +83,13 @@ std::chrono::nanoseconds::rep ZenohReply::get_received_timestamp() const
   return received_timestamp_;
 }
 
+int64_t get_system_time_in_ns()
+{
+  auto now = std::chrono::system_clock::now().time_since_epoch();
+  return std::chrono::duration_cast<std::chrono::nanoseconds>(now).count();
+}
+
+///=============================================================================
 Payload::Payload(const zenoh::Bytes & bytes)
 {
   // NOTE(fuzzypixelz): `zenoh::Bytes` is an list of reference-couted buffers. When the list of

rmw_zenoh_cpp/src/detail/zenoh_utils.hpp

@@ -69,6 +69,8 @@ class ZenohQuery final
   std::chrono::nanoseconds::rep received_timestamp_;
 };
 
+int64_t get_system_time_in_ns();
+
 class Payload
 {
 public: