02f1d28ed6
As freq.QuadValue can be in the range of 10000000 to 19200000, the multiplication before division makes the calculation overflow and wrap to negative values every 16-30 minutes. Instead count the whole seconds separately before adding the scaled fractional seconds. Add a testcase for steady_clock to check that the values returned for now() compare as bigger than the zero time origin; this corresponds to a testcase in Qt [1] [2] (that failed spuriously due to this). [1] https://bugreports.qt.io/browse/QTBUG-89539 [2] https://code.qt.io/cgit/qt/qtbase.git/tree/tests/auto/corelib/kernel/qdeadlinetimer/tst_qdeadlinetimer.cpp?id=f8de5e54022b8b7471131b7ad55c83b69b2684c0#n569 Differential Revision: https://reviews.llvm.org/D93456
33 lines
796 B
C++
33 lines
796 B
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// UNSUPPORTED: libcpp-has-no-monotonic-clock
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// <chrono>
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// steady_clock
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// static time_point now();
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#include <chrono>
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#include <cassert>
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#include "test_macros.h"
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int main(int, char**)
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{
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typedef std::chrono::steady_clock C;
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C::time_point t1 = C::now();
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C::time_point t2 = C::now();
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assert(t2 >= t1);
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// make sure t2 didn't wrap around
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assert(t2 > std::chrono::time_point<C>());
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return 0;
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}
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