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[PATCH] PR libstdc++/68519 use native duration to avoid rounding errors


The result of system_clock::now() + duration<float>(1) is a
duration<float> with the same value as now(), due to the limited
precision of float.

This patch converts the duration to system_clock::duration before
doing the sum, so that we don't lose precision.

	PR libstdc++/68519
	* include/std/condition_variable (condition_variable::wait_for):
	Convert duration to native clock's duration before addition.
	* testsuite/30_threads/condition_variable/members/68519.cc: New test.

Tested powerpc64le-linux, committed to trunk.

Attachment: patch.txt
Description: Text document


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