Check Swaps and MergeDictionary for base::Value

base/values.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file specifies a recursive data storage class called Value intended for
 // storing settings and other persistable data.
 //
 // A Value represents something that can be stored in JSON or passed to/from
 // JavaScript. As such, it is NOT a generalized variant type, since only the
 // types supported by JavaScript/JSON are supported.
@@ skipping 173 matching lines @@
     // in sizeof(Value) = 56 if DictStorage was stack allocated. Allocating it
     // on the heap results in sizeof(Value) = 40 for all of gcc, clang and MSVC.
     ManualConstructor<std::unique_ptr<DictStorage>> dict_ptr_;
     ManualConstructor<ListStorage> list_;
   };
 
  private:
   void InternalCopyFundamentalValue(const Value& that);
   void InternalCopyConstructFrom(const Value& that);
   void InternalMoveConstructFrom(Value&& that);
-  void InternalCopyAssignFrom(const Value& that);
-  void InternalMoveAssignFrom(Value&& that);
+  void InternalCopyAssignFromSameType(const Value& that);
+  void InternalMoveAssignFromSameType(Value&& that);
   void InternalCleanup();
 };
 
 // DictionaryValue provides a key-value dictionary with (optional) "path"
 // parsing for recursive access; see the comment at the top of the file. Keys
 // are |std::string|s and should be UTF-8 encoded.
 class BASE_EXPORT DictionaryValue : public Value {
  public:
   // Returns |value| if it is a dictionary, nullptr otherwise.
   static std::unique_ptr<DictionaryValue> From(std::unique_ptr<Value> value);
@@ skipping 309 matching lines @@
   return out << static_cast<const Value&>(value);
 }
 
 // Stream operator so that enum class Types can be used in log statements.
 BASE_EXPORT std::ostream& operator<<(std::ostream& out,
                                      const Value::Type& type);
 
 }  // namespace base
 
 #endif  // BASE_VALUES_H_