c++ - list.begin() 上的段错误

Question

我的 Folder 类中有这个成员函数:

string _recFullPath() {
 list<Folder*> folders;
 list<Folder*>::iterator it = folders.begin();
 folders.push_front(this);
 it = folders.begin();
 while((*it)->hasParent()) {
  folders.push_front((*it)->parent());
  it = folders.begin();
 }
 folders.push_back(this);
 for(it = folders.begin(); it != folders.end(); ++it) {
  cout << (*it)->getName() << "/";
 }
}

这确实可以编译，但是当涉及到它 = folders.begin() 时，在 while 循环中它给出了一个段错误，我不明白为什么。Folder 对象的布局是这样的:

class Folder {
  private:
    Folder* _parent;
    string _name;
    string _fullPath;
    string _recStrFullPath;
    bool _hasParent;

  public:
    Folder(string name) {
        this->_name = name;
        this->_hasParent = false;
    }

    Folder(string name, Folder* parent) {
        this->_parent = parent;
        this->_name = name;
        this->_hasParent = true;
    }

    Folder* parent() {
        return this->_parent;
    }

    string getName() {
        return this->_name;
    }

};

当然还有上面提到的功能。有人能看出我在上面的代码中做错了什么吗？

Answer 1

我完全不知道为什么你的 while 循环使用迭代器。这会更干净、更简单:

list<Folder*> folders;
Folder* current = this;

while (current->hasParent()) {
    folders.push_front(current);
    current = current.parent();
}

folders.push_front(current);

for(list<Folder*>::const_iterator i = folders.begin(); i != folders.end(); ++i) {
    cout << (*i)->getName() << "/";
}