Move test into test/std subdirectory.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@224658 91177308-0d34-0410-b5e6-96231b3b80d8

test/std/utilities/memory/util.smartptr/util.smartptr.enab/enable_shared_from_this.pass.cpp

@@ -0,0 +1,49 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// template<class T>
+// class enable_shared_from_this
+// {
+// protected:
+//     enable_shared_from_this();
+//     enable_shared_from_this(enable_shared_from_this const&);
+//     enable_shared_from_this& operator=(enable_shared_from_this const&);
+//     ~enable_shared_from_this();
+// public:
+//     shared_ptr<T> shared_from_this();
+//     shared_ptr<T const> shared_from_this() const;
+// };
+
+#include <memory>
+#include <cassert>
+
+struct T
+    : public std::enable_shared_from_this<T>
+{
+};
+
+struct Y : T {};
+
+struct Z : Y {};
+
+int main()
+{
+    {
+    std::shared_ptr<Y> p(new Z);
+    std::shared_ptr<T> q = p->shared_from_this();
+    assert(p == q);
+    assert(!p.owner_before(q) && !q.owner_before(p)); // p and q share ownership
+    }
+    {
+    std::shared_ptr<Y> p = std::make_shared<Z>();
+    std::shared_ptr<T> q = p->shared_from_this();
+    assert(p == q);
+    assert(!p.owner_before(q) && !q.owner_before(p)); // p and q share ownership
+    }
+}