Backport make_unique

C++14 has std::make_unique, which is convenient for working with unique_ptrs.

It is sufficient to backport only the overload for non-array types, the
overload for array types isn't used in ndn-cxx.

Change-Id: I200ba24ace6ed25d695f0ebe5e9b459f5dfc7538
Refs: #3093
diff --git a/tests/unit-tests/util/backports.t.cpp b/tests/unit-tests/util/backports.t.cpp
new file mode 100644
index 0000000..550651a
--- /dev/null
+++ b/tests/unit-tests/util/backports.t.cpp
@@ -0,0 +1,79 @@
+/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
+/**
+ * Copyright (c) 2013-2015 Regents of the University of California.
+ *
+ * This file is part of ndn-cxx library (NDN C++ library with eXperimental eXtensions).
+ *
+ * ndn-cxx library is free software: you can redistribute it and/or modify it under the
+ * terms of the GNU Lesser General Public License as published by the Free Software
+ * Foundation, either version 3 of the License, or (at your option) any later version.
+ *
+ * ndn-cxx library is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+ * PARTICULAR PURPOSE.  See the GNU Lesser General Public License for more details.
+ *
+ * You should have received copies of the GNU General Public License and GNU Lesser
+ * General Public License along with ndn-cxx, e.g., in COPYING.md file.  If not, see
+ * <http://www.gnu.org/licenses/>.
+ *
+ * See AUTHORS.md for complete list of ndn-cxx authors and contributors.
+ */
+
+#include "util/backports.hpp"
+
+#include "boost-test.hpp"
+
+namespace ndn {
+namespace tests {
+
+BOOST_AUTO_TEST_SUITE(Util)
+BOOST_AUTO_TEST_SUITE(TestBackports)
+
+BOOST_AUTO_TEST_CASE(MakeUnique)
+{
+  std::unique_ptr<int> v0 = make_unique<int>();
+  std::unique_ptr<int> v1 = make_unique<int>(1728);
+  BOOST_CHECK_EQUAL(*v0, 0);
+  BOOST_CHECK_EQUAL(*v1, 1728);
+
+  auto str = make_unique<std::string>("meow");
+  BOOST_CHECK_EQUAL(*str, "meow");
+
+  class Movable
+  {
+  public:
+    Movable()
+      : value(42)
+    {
+    }
+
+    Movable(const Movable&) = delete;
+    Movable(Movable&&) = default;
+
+  public:
+    int value;
+  };
+
+  class Container
+  {
+  public:
+    explicit
+    Container(Movable m)
+      : m(std::move(m))
+    {
+    }
+
+  public:
+    Movable m;
+  };
+
+  Movable m;
+  auto ptr = make_unique<Container>(std::move(m));
+  BOOST_CHECK_EQUAL(ptr->m.value, 42);
+}
+
+BOOST_AUTO_TEST_SUITE_END()
+BOOST_AUTO_TEST_SUITE_END()
+
+} // namespace tests
+} // namespace ndn