在以下代码中,为什么
s1.printVal
会导致悬空指针错误?难道s1
对象,即其指针,不是在被销毁之前仍然可访问的吗?class Sample
{
public:
int *ptr;
Sample(int i)
{
ptr = new int(i);
}
~Sample()
{
delete ptr;
}
void PrintVal()
{
cout << "The value is " << *ptr;
}
};
void SomeFunc(Sample x)
{
cout << "Say i am in someFunc " << endl;
}
int main()
{
Sample s1 = 10;
SomeFunc(s1);
s1.PrintVal(); // dangling pointer
}