use of deleted function 'Node::Node(const Node&)'

fT3g0

Hello!
I've come across this bug. Usually it has to do with trying to make a copy of a QObject, and maybe the connect does that, but I'm not sure...
I've cut down the code as much as possible so it still replicates the error

//net.h

#ifndef NET_H
#define NET_H

#include <QObject>
#include "node.h"

class Net : public QObject
{
    Q_OBJECT
public:
    explicit Net(QObject *parent = nullptr);
    void foo();

signals:
    QString requestNodeInfo();

private:
    QVector<Node> node;
};

#endif // NET_H

//node.h

#ifndef NODE_H
#define NODE_H

#include <QObject>

class Net;

class Node : public QObject
{
    Q_OBJECT

public:
    explicit Node(Net *parentNet = nullptr);

public slots:
    QString provideNodeInfo();
};

#endif // NODE_H

//main.cpp

#include <QCoreApplication>

int main(int argc, char *argv[])
{
    QCoreApplication a(argc, argv);

    return a.exec();
}

//net.cpp

#include "net.h"

Net::Net(QObject *parent) : QObject(parent)
{

}

void Net::foo()
{
    for (int i=0; i<node.size(); i++)
    {
    connect(this,&Net::requestNodeInfo,&node[i],&Node::provideNodeInfo);
    }
}

//node.cpp

#include "node.h"
#include "net.h"

Node::Node(Net *parentNet) : QObject(parentNet)
{

}

QString Node::provideNodeInfo()
{

}

The error messages are:
use of deleted function 'Node::Node(const Node&)'
'QObject::QObject(const &QObject) is private within this context

mrjj

Hi and welcome to the forums :)

if this line is correct
QVector<Node> node;
that is the reason.
It has to be
QVector<Node *> node;
or else it will try to copy the Node into the list. (which is not allowed)
So the template type must be * (pointer to Node)

fT3g0

Thank you, had a blind spot there haha!

mrjj

@fT3g0
:) we all know such situations.