Index: test/plugin/PlaceholderTest.cpp
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+/*
+ * This file is part of Adblock Plus <https://adblockplus.org/>,
+ * Copyright (C) 2006-2015 Eyeo GmbH
+ *
+ * Adblock Plus is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 3 as
+ * published by the Free Software Foundation.
+ *
+ * Adblock Plus 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
+ */
+#include <gtest/gtest.h>
+#include "../../src/plugin/ActiveQueue.h"
+#include <ostream>
+#include <memory>
+
+// The C compiler version for VS2012 is 17.00
+#if defined(_MSC_VER) && _MSC_VER <= 1700
+#define DELETED
+#else
+#define DELETED =delete
+#endif
+
+/**
+ * Class with only a copy constructor for an instantiation test.
+ */
+template<class T>
+struct MinimalCopy
+{
+  T value;
+
+  MinimalCopy() DELETED;
+  MinimalCopy(MinimalCopy&&) DELETED;
+  MinimalCopy& operator=(const MinimalCopy&) DELETED;
+  MinimalCopy& operator=(MinimalCopy&&) DELETED;
+
+  MinimalCopy(T x)
+    : value(x)
+  {}
+
+  MinimalCopy(const MinimalCopy& t)
+    : value(t.value)
+  {}
+};
+
+/**
+ * Class with only a move constructor for an instantiation test.
+ */
+template<class T>
+struct MinimalMove
+{
+  std::unique_ptr<int> a; // Not really needed, but illustrative
+  T value;
+
+  MinimalMove() DELETED;
+  MinimalMove(const MinimalMove&) DELETED;
+  MinimalMove& operator=(const MinimalMove&) DELETED;
+  MinimalMove& operator=(MinimalMove&&) DELETED;
+
+  MinimalMove(T x)
+    : a(nullptr), value(x)
+  {}
+
+  MinimalMove(MinimalMove&& x)
+    : a(std::move(x.a)), value(std::move(x.value))
+  {}
+};
+
+/*
+ * These are mostly a compilation tests.
+ * They check that the Placeholder only needs a single constructor, copy or move, to instantiate.
+ *
+ * For VS2012, using C++03 syntax, failure to instantiate the 'Placeholder' template 
+ *   will show up as a link error for one of declared-but-not-defined members.
+ * Using C++11 syntax, it will show up as a compile error.
+ *
+ * Extra blocks in test code illustrate the anticipated use of 'Placeholder'.
+ */
+
+/*
+ * Placeholder works with simple intrinsic types.
+ */
+TEST(Placeholder, Int)
+{
+  Placeholder<int> x;
+  {
+    x.Construct(42);
+  }
+  {
+    ASSERT_EQ(42, x.Object());
+  }
+}
+
+/*
+ * Placeholder works with only a copy constructor.
+ */
+TEST(Placeholder, MinimalCopy)
+{
+  typedef MinimalCopy<int> T;
+  Placeholder<T> x;
+  {
+    T a(42);
+    x.Construct(a); // Can't use a temporary because MinimalCopy has no move constructor (arbitrarily)
+  }
+  int y = 1;
+  {
+    y = x.Object().value;
+  }
+  ASSERT_EQ(42, y);
+}
+
+TEST(Placeholder, MinimalMove)
+{
+  typedef MinimalMove<int> T;
+  Placeholder<T> x;
+  {
+    x.Construct(std::move(T(42)));
+  }
+  int y = 1;
+  {
+    y = x.Object().value;
+  }
+  ASSERT_EQ(42, y);
+}
+
+TEST(Placeholder, MinimalMoveParameter)
+{
+  typedef MinimalMove<int> T;
+  Placeholder<T> x;
+  {
+    x.Construct(std::move(T(42)));
+  }
+  int y = 1;
+  {
+    y = [&](T&& t)
+    {
+      return t.value;
+    }(std::move(x.Object()));
+  }
+  ASSERT_EQ(42, y);
+}
+