Is it important for your product to support being used by two nodes in the same process at the same time?
If `rclcpp` used [std::chrono](
https://en.cppreference.com/w/cpp/named_req/Clock) then there could only be one clock per clock type per process. If a process with two nodes starts and a user sets `use_sim_time` to `true` on one node and `false` on the other then what time should `ros2_clock::now()` return?
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https://discourse.ros.org/t/ros-2-time-vs-std-chrono/6293/4) or reply to this email to respond.
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