QtScript call functions with & arguments

eddystefes

i have a class that has a method with reference arguments:

bool myMethod(QString arg1, int & someRefArg);

how do i make this function callable from QtScript?

if i try it like:

var a = 123;
myObj['myMethod(QString, int&)']("test",a);

TypeError: cannot call myMethod(): argument 2 has unknown type `int&' (register the type with qScriptRegisterMetaType())

I tryed to register the type :

QScriptValue toScriptValue(QScriptEngine *engine, const int &&s)
{
  QScriptValue obj = engine->newObject();
  obj = s;
  return obj;
}

void fromScriptValue(const QScriptValue &obj, int &&s)
{
  s = obj.toInt();
}


qScriptRegisterMetaType(&engine,toScriptValue,fromScriptValue);

but this has no effect.
what do i need to do to pass a reference to the method?

SGaist

Hi,

Is it a typo or are your function signature really:

QScriptValue toScriptValue(QScriptEngine *engine, const int &&s) << one & too much
void fromScriptValue(const QScriptValue &obj, int &&s)  << one & too much

Hope it helps

eddystefes

@SGaist

no not relay the && was intended.

the standard devinition of a fromScriptValue uses one & so it can access the value and does not get a copy. My intention by using 2 && was to actually be able to pass a int& and not just an int . Perhaps this makes it clearer what i want to do:

QScriptValue toScriptValue(QScriptEngine *engine, const (int&) &s)
{
....

void fromScriptValue(const QScriptValue &obj, (int&) &s)
{
....

also now I see in the documentation that I need to register the type with Q_DECLARE_METATYPE. But

Q_DECLARE_METATYPE(int&)

does not compile. :(

SGaist

I see what you want to do but why ?

eddystefes

because:
I want to script some parts the code
and the methods in the library i need to use are defined like this: bool getMyValue(QString, ValueType&)
and i can not change that library
and i do not want to write a wrapper

SGaist

AFAIK, you can't use reference to types to create metatypes

eddystefes

hmm ok :( still thank you for the help