Question

我正在处理一段代码，我不能100％确定它的正确性。请你告诉我你怎么看？（我在Qt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和findClosedWidget - 特别是因为编写正确的findClosedWidget非常重要。而是使用专为此目的而设计的插槽QObject::deleteLater：

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()));

c ++多次将内存分配给同一个指针

1 个答案: