override operator with qtscript

I want do a math editor using qtscript.
It will support array calculating in script. Such as array1 + array2 = array3.({1,2,3}+{3,4,5} = {4,6,8});
Maybe I need override operator+,
I consult the example of QByteArray, and I override operator+,but when I execute in Script,it can't be invoke,anyone coule give me some suggestions?

bytearray.h

Code:

---

class ByteArrayClass : public QObject, public QScriptClass
{
public: 
       QByteArray &operator+(int n);
}
 
main.cpp
int main(int argc, char **argv)
{
    QCoreApplication app(argc, argv);
    QScriptEngine eng;
    ByteArrayClass *baClass = new ByteArrayClass(&eng);
    eng.globalObject().setProperty("ByteArray", baClass->constructor());
    eng.evaluate("ba = new ByteArray(4))" 
    eng.evaluate("ba+2;"); //this will not invoke override operator+.
 
    ByteArrayClass *ba = new ByteArrayClass(&eng);
    int n = 3;
    *ba + n;    //but this can invoke the override operator+
}

---

If this couldn't be realised,maybe the one way is to replace all the operator to the custom function.

QtScript knows nothing about your operator so it can't invoke it.