1 files changed, 148 insertions, 0 deletions
diff --git a/test/std/experimental/optional/optional.object/optional.object.assign/emplace.pass.cpp b/test/std/experimental/optional/optional.object/optional.object.assign/emplace.pass.cpp
new file mode 100644
index 000000000000..c4361ea5178d
--- /dev/null
+++ b/test/std/experimental/optional/optional.object/optional.object.assign/emplace.pass.cpp
@@ -0,0 +1,148 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <optional>
+
+// template <class... Args> void optional<T>::emplace(Args&&... args);
+
+#include <experimental/optional>
+#include <type_traits>
+#include <cassert>
+#include <memory>
+
+#if _LIBCPP_STD_VER > 11
+
+using std::experimental::optional;
+
+class X
+{
+    int i_;
+    int j_ = 0;
+public:
+    X() : i_(0) {}
+    X(int i) : i_(i) {}
+    X(int i, int j) : i_(i), j_(j) {}
+
+    friend bool operator==(const X& x, const X& y)
+        {return x.i_ == y.i_ && x.j_ == y.j_;}
+};
+
+class Y
+{
+public:
+    static bool dtor_called;
+    Y() = default;
+    ~Y() {dtor_called = true;}
+};
+
+bool Y::dtor_called = false;
+
+class Z
+{
+public:
+    static bool dtor_called;
+    Z() = default;
+    Z(int) {throw 6;}
+    ~Z() {dtor_called = true;}
+};
+
+bool Z::dtor_called = false;
+
+#endif  // _LIBCPP_STD_VER > 11
+
+int main()
+{
+#if _LIBCPP_STD_VER > 11
+    {
+        optional<int> opt;
+        opt.emplace();
+        assert(static_cast<bool>(opt) == true);
+        assert(*opt == 0);
+    }
+    {
+        optional<int> opt;
+        opt.emplace(1);
+        assert(static_cast<bool>(opt) == true);
+        assert(*opt == 1);
+    }
+    {
+        optional<int> opt(2);
+        opt.emplace();
+        assert(static_cast<bool>(opt) == true);
+        assert(*opt == 0);
+    }
+    {
+        optional<int> opt(2);
+        opt.emplace(1);
+        assert(static_cast<bool>(opt) == true);
+        assert(*opt == 1);
+    }
+    {
+        optional<X> opt;
+        opt.emplace();
+        assert(static_cast<bool>(opt) == true);
+        assert(*opt == X());
+    }
+    {
+        optional<X> opt;
+        opt.emplace(1);
+        assert(static_cast<bool>(opt) == true);
+        assert(*opt == X(1));
+    }
+    {
+        optional<X> opt;
+        opt.emplace(1, 2);
+        assert(static_cast<bool>(opt) == true);
+        assert(*opt == X(1, 2));
+    }
+    {
+        optional<X> opt(X{3});
+        opt.emplace();
+        assert(static_cast<bool>(opt) == true);
+        assert(*opt == X());
+    }
+    {
+        optional<X> opt(X{3});
+        opt.emplace(1);
+        assert(static_cast<bool>(opt) == true);
+        assert(*opt == X(1));
+    }
+    {
+        optional<X> opt(X{3});
+        opt.emplace(1, 2);
+        assert(static_cast<bool>(opt) == true);
+        assert(*opt == X(1, 2));
+    }
+    {
+        Y y;
+        {
+            optional<Y> opt(y);
+            assert(Y::dtor_called == false);
+            opt.emplace();
+            assert(Y::dtor_called == true);
+        }
+    }
+    {
+        Z z;
+        optional<Z> opt(z);
+        try
+        {
+            assert(static_cast<bool>(opt) == true);
+            assert(Z::dtor_called == false);
+            opt.emplace(1);
+        }
+        catch (int i)
+        {
+            assert(i == 6);
+            assert(static_cast<bool>(opt) == false);
+            assert(Z::dtor_called == true);
+        }
+    }
+#endif  // _LIBCPP_STD_VER > 11
+}