1 files changed, 83 insertions, 0 deletions
diff --git a/Source/WTF/wtf/CrossThreadCopier.cpp b/Source/WTF/wtf/CrossThreadCopier.cpp
new file mode 100644
index 000000000..e59249f98
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+++ b/Source/WTF/wtf/CrossThreadCopier.cpp
@@ -0,0 +1,83 @@
+/*
+ * Copyright (C) 2009 Google Inc. All rights reserved.
+ * Copyright (C) 2011-2016 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include <wtf/CrossThreadCopier.h>
+
+#include <wtf/CrossThreadTask.h>
+
+namespace WTF {
+
+// Test CrossThreadCopier using COMPILE_ASSERT.
+
+// Verify that ThreadSafeRefCounted objects get handled correctly.
+class CopierThreadSafeRefCountedTest : public ThreadSafeRefCounted<CopierThreadSafeRefCountedTest> {
+};
+
+COMPILE_ASSERT((std::is_same<
+                    PassRefPtr<CopierThreadSafeRefCountedTest>,
+                    CrossThreadCopier<PassRefPtr<CopierThreadSafeRefCountedTest>>::Type
+                >::value),
+                PassRefPtrTest);
+COMPILE_ASSERT((std::is_same<
+                    PassRefPtr<CopierThreadSafeRefCountedTest>,
+                    CrossThreadCopier<RefPtr<CopierThreadSafeRefCountedTest>>::Type
+                >::value),
+                RefPtrTest);
+COMPILE_ASSERT((std::is_same<
+                    PassRefPtr<CopierThreadSafeRefCountedTest>,
+                    CrossThreadCopier<CopierThreadSafeRefCountedTest*>::Type
+                >::value),
+                RawPointerTest);
+
+// Add specializations for RefCounted types which will let us verify that no other template matches.
+template<typename T> struct CrossThreadCopierBase<false, false, RefPtr<T>> {
+    typedef int Type;
+};
+
+template<typename T> struct CrossThreadCopierBase<false, false, PassRefPtr<T>> {
+    typedef int Type;
+};
+
+template<typename T> struct CrossThreadCopierBase<false, false, T*> {
+    typedef int Type;
+};
+
+// Verify that RefCounted objects only match the above templates which expose Type as int.
+class CopierRefCountedTest : public RefCounted<CopierRefCountedTest> {
+};
+
+static_assert((std::is_same<int, CrossThreadCopier<PassRefPtr<CopierRefCountedTest>>::Type>::value), "CrossThreadCopier specialization improperly applied to PassRefPtr<> of a RefCounted (but not ThreadSafeRefCounted) type");
+static_assert((std::is_same<int, CrossThreadCopier<RefPtr<CopierRefCountedTest>>::Type>::value), "CrossThreadCopier specialization improperly applied to RefPtr<> of a RefCounted (but not ThreadSafeRefCounted) type");
+static_assert((std::is_same<int, CrossThreadCopier<CopierRefCountedTest*>::Type>::value), "CrossThreadCopier specialization improperly applied to raw pointer of a RefCounted (but not ThreadSafeRefCounted) type");
+
+} // namespace WTF
+