PolyTree outputs only memory adres of parent and childs

#include <clipper/include/clipper.hpp>
#include <iterator>
#include <algorithm>
#include <iostream>

using namespace ClipperLib;
using namespace std;

test::test()
{
    PolyTree array;

    //Paths
    Path one = {{10,10},{100,10},{100,100},{10,100}};   std::cout << "one : " << one << std::endl;
    Path two =  {{20,20},{20,90},{90,90},{90,20}};      std::cout << "two : " << two << std::endl;
    Path three = {{30,30},{50,30},{50,50},{30,50}};     std::cout << "three : " << three << std::endl;
    Path four = {{60,60},{80,60},{80,80},{60,80}};      std::cout << "four : " << four << std::endl;

    Paths total;
    total.push_back(one);
    total.push_back(two);
    total.push_back(three);
    total.push_back(four);
    std::cout << "total: " << total << std::endl;

    ClipperLib::Clipper c;
    c.AddPaths(total, ptSubject, true);
    c.Execute(ctDifference,array);
    c.Clear();

    PolyNode* polynode = array.GetFirst();

    while (polynode)
       {
           //do stuff with polynode here
           qDebug()<< "qdebug parent : " << polynode->Parent;
           std::cout << "std parent : " << polynode->Parent << std::endl;
           qDebug()<< "qdebug childs : " << polynode->Childs;
           qDebug()<< "qdebug isHole : " << polynode->IsHole();
           qDebug()<< "qdebug childcount : " << polynode->ChildCount();
           //qDebug()<< "qdebug contour : " << polynode->Contour; //error
           std::cout << "std contour : " << polynode->Contour << std::endl;

           polynode = polynode->GetNext();
       }
}

qdebug parent :  0x7fffaf129ae0
std parent : 0x7fffaf129ae0
qdebug childs :  std::vector(0x55867fa62970)
qdebug isHole :  false
qdebug childcount :  1
std contour : (100,100), (10,100), (10,10), (100,10)