[libgpiod] cxx bindings: time_point vs duration

[Helmut Grohne <helmut.grohne@xxxxxxxxxx>]

Hi,

I was trying to use the C++ bindings of libgpiod and wondered about
this.

| struct line_event {
| 	...
| 	::std::chrono::nanoseconds timestamp;
| 	...
| };

std::chrono::nanoseconds is a duration, an interval of time. The member
is called timestamp. It is documented as an estimate of the time point
when the event actually happened. It seems to me that conceptually
std::chrono::time_point would have type of choice here. What was the
reason for not using it?

Helmut