c++ - boost::shared_ptr 和动态转换

Question

我在使用基类的 shared_ptr 时遇到问题，我似乎无法在取消引用派生类的方法时调用它。我相信代码会比我更冗长:

class Base : public boost::enable_shared_from_this<Base>
{
  public:
    typedef  boost::shared_ptr<BabelNet> pointer;
};

class Derived : public Base
{
  public:
     static pointer  create()
                {
                        return pointer(new Derived);
                }
     void             anyMethod()
     {
        Base::pointer foo = Derived::create();
        // I can't call any method of Derived with foo
        // How can I manage to do this ?
        // is dynamic_cast a valid answer ?
        foo->derivedMethod(); // -> compilation fail
     }

};

Answer 1

见 static_cast with boost::shared_ptr?

您需要使用 dynamic_pointer_cast获得适当的 shared_ptr 实例化。 (对应一个dynamic_cast)