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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.
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