c++ - 气候依赖和共享指针和弱指针

Question

我有以下场景:

但是，我遇到了一些内存问题，因为我的 Dispatcher 似乎在发送到 Window 之前就被删除了。

伪代码看起来像这样:

class Kernel
{
    shared_ptr<Window> window;
    shared_ptr<Dispatcher> dispatcher;
}

class Window
{
    weak_ptr<Dispatcher> dispatcher;
}

class Dispatcher
{}

如何正确使用智能指针来解决这个问题？

Answer 1

我写了例子 http://cpp.sh/8dkv7

如您所见，您的代码是正确的:

  #include <iostream>
  #include <memory>

  class Dispatcher;
  class Window;

  class Kernel
  {
  public:
    std::shared_ptr<Window> window;
    std::shared_ptr<Dispatcher> dispatcher;
  };

  class Window
  {
  public:
    std::weak_ptr<Dispatcher> dispatcher;
  };

  class Dispatcher
  {
  };

  int main()
  {
    Kernel k;
    k.window = std::make_shared<Window>();
    k.dispatcher = std::make_shared<Dispatcher>();
    k.window->dispatcher = k.dispatcher;
    if( auto dispatcher = k.window->dispatcher.lock() ) {
        std::cout << "ok\n"; // i see ok, what about you?
    }
  }