Implement N3672, optional<T>.

llvm-svn: 189772

1 files changed, 115 insertions, 0 deletions

diff --git a/libcxx/test/utilities/optional/optional.object/optional.object.ctor/const_T.pass.cpp b/libcxx/test/utilities/optional/optional.object/optional.object.ctor/const_T.pass.cpp
new file mode 100644
index 00000000000..2e69b30580a
--- /dev/null
+++ b/libcxx/test/utilities/optional/optional.object/optional.object.ctor/const_T.pass.cpp
@@ -0,0 +1,115 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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>
+
+// constexpr optional(const T& v);
+
+#include <optional>
+#include <type_traits>
+#include <cassert>
+
+#if _LIBCPP_STD_VER > 11
+
+class X
+{
+    int i_;
+public:
+    X(int i) : i_(i) {}
+
+    friend bool operator==(const X& x, const X& y) {return x.i_ == y.i_;}
+};
+
+class Y
+{
+    int i_;
+public:
+    constexpr Y(int i) : i_(i) {}
+
+    friend constexpr bool operator==(const Y& x, const Y& y) {return x.i_ == y.i_;}
+};
+
+class Z
+{
+    int i_;
+public:
+    Z(int i) : i_(i) {}
+    Z(const Z&) {throw 6;}
+};
+
+
+#endif  // _LIBCPP_STD_VER > 11
+
+int main()
+{
+#if _LIBCPP_STD_VER > 11
+    {
+        typedef int T;
+        constexpr T t(5);
+        constexpr std::optional<T> opt(t);
+        static_assert(static_cast<bool>(opt) == true, "");
+        static_assert(*opt == 5, "");
+
+        struct test_constexpr_ctor
+            : public std::optional<T>
+        {
+            constexpr test_constexpr_ctor(const T&) {}
+        };
+
+    }
+    {
+        typedef double T;
+        constexpr T t(3);
+        constexpr std::optional<T> opt(t);
+        static_assert(static_cast<bool>(opt) == true, "");
+        static_assert(*opt == 3, "");
+
+        struct test_constexpr_ctor
+            : public std::optional<T>
+        {
+            constexpr test_constexpr_ctor(const T&) {}
+        };
+
+    }
+    {
+        typedef X T;
+        const T t(3);
+        std::optional<T> opt(t);
+        assert(static_cast<bool>(opt) == true);
+        assert(*opt == 3);
+    }
+    {
+        typedef Y T;
+        constexpr T t(3);
+        constexpr std::optional<T> opt(t);
+        static_assert(static_cast<bool>(opt) == true, "");
+        static_assert(*opt == 3, "");
+
+        struct test_constexpr_ctor
+            : public std::optional<T>
+        {
+            constexpr test_constexpr_ctor(const T&) {}
+        };
+
+    }
+    {
+        typedef Z T;
+        try
+        {
+            const T t(3);
+            std::optional<T> opt(t);
+            assert(false);
+        }
+        catch (int i)
+        {
+            assert(i == 6);
+        }
+    }
+#endif  // _LIBCPP_STD_VER > 11
+}