qml can not recognize the c++ parameters with &

[stereoMatching]

pass two arguments into the c++ api from qml site
when I add & on the api, the app can not recognize the signature
of the function.

.hpp

#ifndef TESTPARAM_HPP
    #define TESTPARAM_HPP
 
    #include <QList>
    #include <QObject>
    #include <QUrl>
 
    class testParam : public QObject
    {
        Q_OBJECT
    public:
        explicit testParam(QObject *parent = 0);
 
    signals:
 
    public slots:
        void test(QList<QUrl> &first, QList<QUrl> &second)
        {
 
        }
 
    };
 
    #endif // TESTPARAM_HPP

#ifndef TESTPARAM_HPP
    #define TESTPARAM_HPP
     
    #include <QList>
    #include <QObject>
    #include <QUrl>
     
    class testParam : public QObject
    {
        Q_OBJECT
    public:
        explicit testParam(QObject *parent = 0);
       
    signals:
       
    public slots:
        void test(QList<QUrl> &first, QList<QUrl> &second)
        {
     
        }
       
    };
     
    #endif // TESTPARAM_HPP

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.cpp

#include "testParam.hpp"
 
    testParam::testParam(QObject *parent) :
        QObject(parent)
    {
    }

#include "testParam.hpp"
     
    testParam::testParam(QObject *parent) :
        QObject(parent)
    {
    }

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main.qml

import QtQuick 2.1
    import QtQuick.Dialogs 1.0
 
    import Test 1.0
 
    Rectangle {
        width: 100
        height: 62
 
        TestParam{
            id: testParam
        }
 
        FileDialog{
            id: fileDialog
            //selectFolder: param.selectFolder
            selectMultiple: true
            nameFilters: [ "Image files (*.bmp *.jpg *.JPEG *.png *.ppm *.tiff *.xbm *.xpm)" ]
            onAccepted: {
                testParam.test(fileDialog.fileUrls, fileDialog.fileUrls);
            }
        }
 
        MouseArea{
            anchors.fill: parent
 
            onClicked: {
                fileDialog.open();
            }
        }
    }

import QtQuick 2.1
    import QtQuick.Dialogs 1.0
     
    import Test 1.0
     
    Rectangle {
        width: 100
        height: 62
     
        TestParam{
            id: testParam
        }
     
        FileDialog{
            id: fileDialog
            //selectFolder: param.selectFolder
            selectMultiple: true
            nameFilters: [ "Image files (*.bmp *.jpg *.JPEG *.png *.ppm *.tiff *.xbm *.xpm)" ]
            onAccepted: {
                testParam.test(fileDialog.fileUrls, fileDialog.fileUrls);
            }
        }
     
        MouseArea{
            anchors.fill: parent
     
            onClicked: {
                fileDialog.open();
            }
        }
    }

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error message

Error: Unknown method parameter type: QList<QUrl>&

They are fine if
1 : strip the &
2 : reduce the parameters of “test” to a single parameter, that way you can preserve the &

Anyway to pass the parameters as reference into the “test” with two parameters?