Vendor import of libc++ trunk r256633:vendor/libc++/r256633

https://llvm.org/svn/llvm-project/libcxx/trunk@256633

1 files changed, 50 insertions, 0 deletions

diff --git a/test/std/utilities/time/time.duration/time.duration.cast/round.pass.cpp b/test/std/utilities/time/time.duration/time.duration.cast/round.pass.cpp
new file mode 100644
index 000000000000..e50b85c991a2
--- /dev/null
+++ b/test/std/utilities/time/time.duration/time.duration.cast/round.pass.cpp
@@ -0,0 +1,50 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// UNSUPPORTED: c++03, c++11, c++14
+// <chrono>
+
+// round
+
+// template <class ToDuration, class Rep, class Period>
+//   constexpr
+//   ToDuration
+//   ceil(const duration<Rep, Period>& d);
+
+#include <chrono>
+#include <type_traits>
+#include <cassert>
+
+template <class ToDuration, class FromDuration>
+void
+test(const FromDuration& f, const ToDuration& d)
+{
+    {
+    typedef decltype(std::chrono::round<ToDuration>(f)) R;
+    static_assert((std::is_same<R, ToDuration>::value), "");
+    assert(std::chrono::round<ToDuration>(f) == d);
+    }
+}
+
+int main()
+{
+//  7290000ms is 2 hours, 1 minute, and 30 seconds
+    test(std::chrono::milliseconds( 7290000), std::chrono::hours( 2));
+    test(std::chrono::milliseconds(-7290000), std::chrono::hours(-2));
+    test(std::chrono::milliseconds( 7290000), std::chrono::minutes( 122));
+    test(std::chrono::milliseconds(-7290000), std::chrono::minutes(-122));
+
+    {
+//  9000000ms is 2 hours and 30 minutes
+    constexpr std::chrono::hours h1 = std::chrono::round<std::chrono::hours>(std::chrono::milliseconds(9000000));
+    static_assert(h1.count() == 2, "");
+    constexpr std::chrono::hours h2 = std::chrono::round<std::chrono::hours>(std::chrono::milliseconds(-9000000));
+    static_assert(h2.count() == -2, "");
+    }
+}