[Development] Best-practice data type to pass JSON data between C++ and QML

[Milian Wolff]

Hey there!

What data type is the most efficient to pass JSON data between C++ and QML? Is 
there one which does not incur any conversions at all? I tried with 
QVariantMap and QJsonObject, both work more or less equally well I think. Are 
both the best you can get?

I'm interested in both ways btw., i.e.:

test.qml
Item {
  function foo() {
    for(var i in myObj.data) {
      console.log(i, myObj.data[i]);
    }
    myObj.data = {foo: "bar", asdf: 42.0};
}


MyObj.h

typedef JSONData ?;

class MyObj : public QObject {
  Q_OBJECT
  Q_PROPERTY(data READ data WRITE setData NOTIFY dataChanged)
public:
  JSONData data() const;
  void setData(const JSONData& data) const;
signals:
  void dataChanged(JSONData);
};

Thanks
-- 
Milian Wolff
mail at milianw.de
http://milianw.de