Add copy and assignment to FundamentalValue and StringValue.

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 setting and other persistable data.  It includes the ability to
 // specify (recursive) lists and dictionaries, so it's fairly expressive.
 // However, the API is optimized for the common case, namely storing a
 // hierarchical tree of simple values.  Given a DictionaryValue root, you can
 // easily do things like:
@@ skipping 48 matching lines @@
     TYPE_INTEGER,
     TYPE_DOUBLE,
     TYPE_STRING,
     TYPE_BINARY,
     TYPE_DICTIONARY,
     TYPE_LIST
   };
 
   virtual ~Value();
 
-  // Convenience methods for creating Value objects for various
-  // kinds of values without thinking about which class implements them.
-  // These can always be expected to return a valid Value*.
   static Value* CreateNullValue();
+  // DEPRECATED: Do not use the following 5 functions. Instead, use
+  // new FundamentalValue or new StringValue.
   static FundamentalValue* CreateBooleanValue(bool in_value);
   static FundamentalValue* CreateIntegerValue(int in_value);
   static FundamentalValue* CreateDoubleValue(double in_value);
   static StringValue* CreateStringValue(const std::string& in_value);
   static StringValue* CreateStringValue(const string16& in_value);
 
   // Returns the type of the value stored by the current Value object.
   // Each type will be implemented by only one subclass of Value, so it's
   // safe to use the Type to determine whether you can cast from
   // Value* to (Implementing Class)*.  Also, a Value object never changes
@@ skipping 25 matching lines @@
   virtual Value* DeepCopy() const;
 
   // Compares if two Value objects have equal contents.
   virtual bool Equals(const Value* other) const;
 
   // Compares if two Value objects have equal contents. Can handle NULLs.
   // NULLs are considered equal but different from Value::CreateNullValue().
   static bool Equals(const Value* a, const Value* b);
 
  protected:
-  // This isn't safe for end-users (they should use the Create*Value()
-  // static methods above), but it's useful for subclasses.
+  // These aren't safe for end-users, but they are useful for subclasses.
   explicit Value(Type type);
+  Value(const Value& that);
+  Value& operator=(const Value& that);
 
  private:
-  Value();
-
   Type type_;
-
-  DISALLOW_COPY_AND_ASSIGN(Value);
 };
 
 // FundamentalValue represents the simple fundamental types of values.
 class BASE_EXPORT FundamentalValue : public Value {
  public:
   explicit FundamentalValue(bool in_value);
   explicit FundamentalValue(int in_value);
   explicit FundamentalValue(double in_value);
   virtual ~FundamentalValue();
 
   // Overridden from Value:
   virtual bool GetAsBoolean(bool* out_value) const OVERRIDE;
   virtual bool GetAsInteger(int* out_value) const OVERRIDE;
   virtual bool GetAsDouble(double* out_value) const OVERRIDE;
   virtual FundamentalValue* DeepCopy() const OVERRIDE;
   virtual bool Equals(const Value* other) const OVERRIDE;
 
  private:
   union {
     bool boolean_value_;
     int integer_value_;
     double double_value_;
   };
-
-  DISALLOW_COPY_AND_ASSIGN(FundamentalValue);
 };
 
 class BASE_EXPORT StringValue : public Value {
  public:
   // Initializes a StringValue with a UTF-8 narrow character string.
   explicit StringValue(const std::string& in_value);
 
   // Initializes a StringValue with a string16.
   explicit StringValue(const string16& in_value);
 
   virtual ~StringValue();
 
   // Overridden from Value:
   virtual bool GetAsString(std::string* out_value) const OVERRIDE;
   virtual bool GetAsString(string16* out_value) const OVERRIDE;
   virtual StringValue* DeepCopy() const OVERRIDE;
   virtual bool Equals(const Value* other) const OVERRIDE;
 
  private:
   std::string value_;
-
-  DISALLOW_COPY_AND_ASSIGN(StringValue);
 };
 
 class BASE_EXPORT BinaryValue: public Value {
  public:
   virtual ~BinaryValue();
 
   // Creates a Value to represent a binary buffer.  The new object takes
   // ownership of the pointer passed in, if successful.
   // Returns NULL if buffer is NULL.
   static BinaryValue* Create(char* buffer, size_t size);
@@ skipping 345 matching lines @@
 
 }  // namespace base
 
 // http://crbug.com/88666
 using base::DictionaryValue;
 using base::ListValue;
 using base::StringValue;
 using base::Value;
 
 #endif  // BASE_VALUES_H_