c++ - 如何使用 QScopedPointer

Question

我有一个使用的例子

QApplication app(argc,argv);
QStandardItemModel* model = new QStandardItemModel(r,c,&app);

但在我的程序中，我有

QScopedPointer<QApplication> app(createApplication(argc, argv));
QStandardItemModel* model = new QStandardItemModel(r,c,&app); //ERROR: no matching function

如何正确使用此 QScopedPointer？

Answer 1

使用app.data(). 虽然QApplication在堆上创建是非常不寻常的......

Answer 2

QScopedPointer<QApplication> app(createApplication(argc, argv));
QStandardItemModel* model = new QStandardItemModel(r,c,app.data());

Answer 3

希望有用

#include <QScopedPointer>
class  target
{
 public:
 int var;
};
class logic
{
 public:
 QScopedPointer<target> variable;
 target* variable2;
};
int main()
{
 logic LogicClass;
 LogicClass.variable.reset(new target);
 LogicClass.variable->var=10;
 cout<<LogicClass.variable->var<<endl;

LogicClass.variable2 = new target;
LogicClass.variable2->var = 20;
cout<<LogicClass.variable2->var<<endl;
delete LogicClass.variable2;
return 0;
}