WTF: Implement move of Deques.

third_party/WebKit/Source/wtf/HashSetTest.cpp

 /*
  * Copyright (C) 2012 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 190 matching lines @@
     EXPECT_TRUE(isDeleted);
     EXPECT_TRUE(set.isEmpty());
     EXPECT_EQ(1, DummyRefCounted::s_refInvokesCount);
 }
 
 class CountCopy final {
 public:
     static int* const kDeletedValue;
 
     explicit CountCopy(int* counter = nullptr) : m_counter(counter) { }
-    CountCopy(const CountCopy& other) : m_counter(other.m_counter)
+    CountCopy(const CountCopy& other)
+        : m_counter(other.m_counter)
     {
         if (m_counter && m_counter != kDeletedValue)
             ++*m_counter;
     }
+    CountCopy& operator=(const CountCopy& other)
+    {
+        m_counter = other.m_counter;
+        if (m_counter && m_counter != kDeletedValue)
+            ++*m_counter;
+        return *this;
+    }
     const int* counter() const { return m_counter; }
 
 private:
     int* m_counter;
 };
 
 int* const CountCopy::kDeletedValue = reinterpret_cast<int*>(static_cast<uintptr_t>(-1));
 
 struct CountCopyHashTraits : public GenericHashTraits<CountCopy> {
     static const bool emptyValueIsZero = false;
@@ skipping 159 matching lines @@
     EXPECT_EQ(13, thirteen.id());
     iter = set.find(MoveOnly(13));
     EXPECT_TRUE(iter == set.end());
 
     set.clear();
 }
 
 } // anonymous namespace
 
 } // namespace WTF