WTF: Implement move of Deques.

third_party/WebKit/Source/wtf/HashMapTest.cpp

 /*
  * Copyright (C) 2011 Google 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 460 matching lines @@
     iter = map.find(MoveOnly(13));
     EXPECT_TRUE(iter == map.end());
 
     map.clear();
 }
 
 class CountCopy final {
 public:
     CountCopy() : m_counter(nullptr) { }
     explicit CountCopy(int& counter) : 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;
     }
+    CountCopy& operator=(const CountCopy& other)
+    {
+        m_counter = other.m_counter;
+        if (m_counter)
+            ++*m_counter;
+        return *this;
+    }
 
 private:
     int* m_counter;
 };
 
 TEST(HashMapTest, MoveShouldNotMakeCopy)
 {
     HashMap<int, CountCopy> map;
     int counter = 0;
     map.add(1, CountCopy(counter));
 
     HashMap<int, CountCopy> other(map);
     counter = 0;
     map = std::move(other);
     EXPECT_EQ(0, counter);
 
     counter = 0;
     HashMap<int, CountCopy> yetAnother(std::move(map));
     EXPECT_EQ(0, counter);
 }
 
 } // anonymous namespace
 
 } // namespace WTF