1 files changed, 56 insertions, 0 deletions
diff --git a/libcxx/test/std/numerics/rand/rand.eng/rand.eng.mers/copy.pass.cpp b/libcxx/test/std/numerics/rand/rand.eng/rand.eng.mers/copy.pass.cpp
new file mode 100644
index 00000000000..57c015ccce1
--- /dev/null
+++ b/libcxx/test/std/numerics/rand/rand.eng/rand.eng.mers/copy.pass.cpp
@@ -0,0 +1,56 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <random>
+
+// template <class UIntType, size_t w, size_t n, size_t m, size_t r,
+//           UIntType a, size_t u, UIntType d, size_t s,
+//           UIntType b, size_t t, UIntType c, size_t l, UIntType f>
+// class mersenne_twister_engine;
+
+// mersenne_twister_engine(const mersenne_twister_engine&);
+
+#include <random>
+#include <cassert>
+
+void
+test1()
+{
+    typedef std::mt19937 E;
+    E e1;
+    e1();
+    E e2 = e1;
+    assert(e1 == e2);
+    assert(e1() == e2());
+    E::result_type k = e1();
+    assert(e1 != e2);
+    assert(e2() == k);
+    assert(e1 == e2);
+}
+
+void
+test2()
+{
+    typedef std::mt19937_64 E;
+    E e1;
+    e1();
+    E e2(e1);
+    assert(e1 == e2);
+    assert(e1() == e2());
+    E::result_type k = e1();
+    assert(e1 != e2);
+    assert(e2() == k);
+    assert(e1 == e2);
+}
+
+int main()
+{
+    test1();
+    test2();
+}