Add scoped_ptr-safe base::Value to Dictionary/List conversion functions.

base/values.cc

 // 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.
 
 #include "base/values.h"
 
 #include <string.h>
 
 #include <algorithm>
 #include <cmath>
@@ skipping 333 matching lines @@
   if (other->GetType() != GetType())
     return false;
   const BinaryValue* other_binary = static_cast<const BinaryValue*>(other);
   if (other_binary->size_ != size_)
     return false;
   return !memcmp(GetBuffer(), other_binary->GetBuffer(), size_);
 }
 
 ///////////////////// DictionaryValue ////////////////////
 
+// static
+scoped_ptr<DictionaryValue> DictionaryValue::From(scoped_ptr<Value> value) {
+  DictionaryValue* out;
+  if (value && value->GetAsDictionary(&out)) {
+    ignore_result(value.release());
+    return make_scoped_ptr(out);
+  }
+  return nullptr;
+}
+
 DictionaryValue::DictionaryValue()
     : Value(TYPE_DICTIONARY) {
 }
 
 DictionaryValue::~DictionaryValue() {
   Clear();
 }
 
 bool DictionaryValue::GetAsDictionary(DictionaryValue** out_value) {
   if (out_value)
@@ skipping 499 matching lines @@
     rhs_it.Advance();
   }
   if (!lhs_it.IsAtEnd() || !rhs_it.IsAtEnd())
     return false;
 
   return true;
 }
 
 ///////////////////// ListValue ////////////////////
 
+// static
+scoped_ptr<ListValue> ListValue::From(scoped_ptr<Value> value) {
+  ListValue* out;
+  if (value && value->GetAsList(&out)) {
+    ignore_result(value.release());
+    return make_scoped_ptr(out);
+  }
+  return nullptr;
+}
+
 ListValue::ListValue() : Value(TYPE_LIST) {
 }
 
 ListValue::~ListValue() {
   Clear();
 }
 
 void ListValue::Clear() {
   for (ValueVector::iterator i(list_.begin()); i != list_.end(); ++i)
     delete *i;
@@ skipping 292 matching lines @@
 ValueDeserializer::~ValueDeserializer() {
 }
 
 std::ostream& operator<<(std::ostream& out, const Value& value) {
   std::string json;
   JSONWriter::WriteWithOptions(value, JSONWriter::OPTIONS_PRETTY_PRINT, &json);
   return out << json;
 }
 
 }  // namespace base