c++ - c++多次内存分配给同一个指针

Question

我正在处理一段代码，我不能 100% 确定它的正确性。请问您能告诉我您对此有何看法吗？（我在 Qt 中编码）

只有一个样本：

CustomWidget *widget; //defined as private

widget = new CustomWidget(this);
connect(widget,SIGNAL(onCLose(), this, SLOT(onWidgetClose()));

widget = new CustomWidget(this);
connect(widget,SIGNAL(onCLose(), this, SLOT(onWidgetClose()));

widget = new CustomWidget(this);
connect(widget,SIGNAL(onCLose(), this, SLOT(onWidgetClose()));


void onWidgetClose(){
   CustomWidget *w = findClosedWidget();
   delete w;
}

Answer 1

没有必要编写自己的onWidgetClose-findClosedWidget特别是因为编写正确的代码findClosedWidget将非常重要。QObject::deleteLater而是使用专为此目的设计的插槽：

CustomWidget *widget; //defined as private

widget = new CustomWidget(this);
connect(widget,SIGNAL(onCLose(), widget, SLOT(deleteLater()));

widget = new CustomWidget(this);
connect(widget,SIGNAL(onCLose(), widget, SLOT(deleteLater()));

widget = new CustomWidget(this);
connect(widget,SIGNAL(onCLose(), widget, SLOT(deleteLater()));