4
当我有一个SuperParent
类,一类Parent
(来自SuperParent
衍生)和既含有shared_ptr
到Child
类(其含有一个weak_ptr
到SuperParent
)。不幸的是,当试图设置Child
的指针时,我得到了一个bad_weak_ptr
异常。代码如下:bad_weak_ptr调用shared_from_this()中的基类
#include <boost/enable_shared_from_this.hpp>
#include <boost/make_shared.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/weak_ptr.hpp>
using namespace boost;
class SuperParent;
class Child {
public:
void SetParent(shared_ptr<SuperParent> parent)
{
parent_ = parent;
}
private:
weak_ptr<SuperParent> parent_;
};
class SuperParent : public enable_shared_from_this<SuperParent> {
protected:
void InformChild(shared_ptr<Child> grandson)
{
grandson->SetParent(shared_from_this());
grandson_ = grandson;
}
private:
shared_ptr<Child> grandson_;
};
class Parent : public SuperParent, public enable_shared_from_this<Parent> {
public:
void Init()
{
child_ = make_shared<Child>();
InformChild(child_);
}
private:
shared_ptr<Child> child_;
};
int main()
{
shared_ptr<Parent> parent = make_shared<Parent>();
parent->Init();
return 0;
}