Should I need to free the memory when using QJsonObject.toObject?

[Maxx Adam]

I have an QJsonObject from QJsonDocument like this:

void some_function() {
  auto doc = QJsonDocument::fromJson(...);
  auto dataNode = doc.object().value("data");
  auto dataObj = dataNode.toObject();
  ...
}

Should I need to free dataNode and dataObj? Why?
Thanks.

[jsulm]

@Maxx-Adam said in Should I need to free the memory when using QJsonObject.toObject?:

How can I get that JsonObject from in the function

Simply return it:

QJsonObject parseJsonDocument(QJsonDocument &doc, std::shared_ptr<QJsonObject> &obj) {
  auto dataNode = doc.object().value("data");
  auto dataObj = dataNode.toObject();
  return dataObject;;
}

[Christian Ehrlicher]

@Maxx-Adam said in Should I need to free the memory when using QJsonObject.toObject?:

Should I need to free dataNode and dataObj?

How would you free the memory of an object on the stack by your own? Please learn c++ first.

An object on the stack is automatically deleted when the stack frame is left.

[J.Hilk]

@Maxx-Adam the pitfalls of auto

had you used proper type declarations and you can see if its heap allocated or not.

Or if you insist in auto, * your variable and you will get a compile time error

[Maxx Adam]

@Christian-Ehrlicher Thanks. But I have another question.
How can I get that JsonObject from in the function. For example:

std::shared_ptr<QJsonObject> outerObj;  //I need to get that dataObj
auto success = parseJsonDocument(doc, outerObj);
...

bool parseJsonDocument(QJsonDocument &doc, std::shared_ptr<QJsonObject> &obj) {
  auto dataNode = doc.object().value("data");
  auto dataObj = dataNode.toObject();
  obj = std::make_shared<QJsonObject>(dataObj);   //Is it legal?
  return true;
}

[jsulm]

@Maxx-Adam said in Should I need to free the memory when using QJsonObject.toObject?:

How can I get that JsonObject from in the function

Simply return it:

QJsonObject parseJsonDocument(QJsonDocument &doc, std::shared_ptr<QJsonObject> &obj) {
  auto dataNode = doc.object().value("data");
  auto dataObj = dataNode.toObject();
  return dataObject;;
}