How to know child Window is destroyed form parent Window - c++

Question

I have a parent-child window in my Qt application. Parent class is a QDialog named A and child class is QMainWindow named B. Now I want that whenever B is closed through the 'X' button a signal is to be emitted which can be caught by a slot in class A through which I want certain functionality to be implemented. Is there a predefined signal in Qt I can use?
I want something like this:
B *b=new B;
//some code
connect(b,SIGNAL(destroyed()),this,&A::doSomething);
B also has a QWidget which I can use to detect the destroyed signal. How do I implement this? Do I need to emit a custom signal from ~B() ?
Edit: I don't want to destroy the object b as this would require a reallocation when I want to recreate the window B from A and I want to keep the parameters of b.

Answer 1

Your solution would only work if you set a Qt::WA_DeleteOnClose attribute to your B widget:
b->setAttribute(Qt::WA_DeleteOnClose);
Another option would be to reimplement close event and emit a custom signal there.

Answer 2

Connect your object like this:
widget = new QWidget();
//widget->show(); //optional using
connect(widget, &QWidget::destroyed, this, &MainWindow::widgetDestroy);
widget->setAttribute(Qt::WA_DeleteOnClose);
.cpp :
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_pushButtonNew_clicked()
{
widget = new QWidget();
widget->show();
connect(widget, &QWidget::destroyed, this, &MainWindow::widgetDestroy);
widget->setAttribute(Qt::WA_DeleteOnClose);
}
void MainWindow::on_pushButtonDel_clicked()
{
delete widget;
}
void MainWindow::widgetDestroy()
{
qDebug()<< "deleted."; //after destroy widget this function calling.
}
.h :
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QWidget>
#include <QDebug>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private slots:
void widgetDestroy();
void on_pushButtonNew_clicked();
void on_pushButtonDel_clicked();
private:
Ui::MainWindow *ui;
QWidget *widget;
};
#endif // MAINWINDOW_H
.ui :