Introduce Value::GetList and Value(ListStorage)

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 80 matching lines @@
   explicit Value(std::string&& in_string) noexcept;
   explicit Value(const char16* in_string);
   explicit Value(const string16& in_string);
   explicit Value(StringPiece in_string);
 
   explicit Value(const BlobStorage& in_blob);
   explicit Value(BlobStorage&& in_blob) noexcept;
 
   explicit Value(DictStorage&& in_dict) noexcept;
 
+  explicit Value(const ListStorage& in_list);
+  explicit Value(ListStorage&& in_list) noexcept;
+
   Value& operator=(const Value& that);
   Value& operator=(Value&& that) noexcept;
 
   ~Value();
 
   // Returns the name for a given |type|.
   static const char* GetTypeName(Type type);
 
   // 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
@@ skipping 13 matching lines @@
   bool is_dict() const { return type() == Type::DICTIONARY; }
   bool is_list() const { return type() == Type::LIST; }
 
   // These will all fatally assert if the type doesn't match.
   bool GetBool() const;
   int GetInt() const;
   double GetDouble() const;  // Implicitly converts from int if necessary.
   const std::string& GetString() const;
   const BlobStorage& GetBlob() const;
 
+  ListStorage& GetList();
+  const ListStorage& GetList() const;
+
   size_t GetSize() const;         // DEPRECATED, use GetBlob().size() instead.
   const char* GetBuffer() const;  // DEPRECATED, use GetBlob().data() instead.
 
   // These methods allow the convenient retrieval of the contents of the Value.
   // If the current object can be converted into the given type, the value is
   // returned through the |out_value| parameter and true is returned;
   // otherwise, false is returned and |out_value| is unchanged.
   bool GetAsBoolean(bool* out_value) const;
   bool GetAsInteger(int* out_value) const;
   bool GetAsDouble(double* out_value) const;
@@ skipping 388 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_