的boost ::工厂创建的boost :: enable_shared_from_this类

Question

我有多个类与

class A : public boost::enable_shared_from_this<A> { 
    public: 
     typedef boost::shared_ptr<A> pointer; 

     static pointer create(tcp::socket& socket) { 
      return pointer(new A(socket)); 
     } 
    private: 
     A(&tcp::socket socket) : m_socket(socket) {} 

     tcp::socket& m_socket; 
} 

Class Aa : public A { 
    public: 
     typedef boost::shared_ptr<Aa> pointer; 

     static pointer create(tcp::socket& socket) { 
      return pointer(new Aa(socket)); 
     } 

    private: 
     Aa(&tcp::socket socket) : A(socket) {} 
} 

Class Ab : public A { 
    public: 
     typedef boost::shared_ptr<Ab> pointer; 

     static pointer create(tcp::socket& socket) { 
      return pointer(new Ab(socket)); 
     } 

    private: 
     Ab(&tcp::socket socket) : A(socket) {} 
} 

推导[...]

Class Ax : public A { 
    public: 
     typedef boost::shared_ptr<Ax> pointer; 

     static pointer create(tcp::socket& socket) { 
      return pointer(new Ax(socket)); 
     } 

    private: 
     Ax(&tcp::socket socket) : A(socket) {} 
} 

我想创建一个使用升压工厂模式： ：工厂 我已经创作的类似的东西：

class MyFactory { 
    public: 
     static MyFactory* getInstance(); 

     typedef boost::function< A(tcp::socket) > a_fact; 

    private: 
     MyFactory() { 
      map["Aa"] = boost::bind(boost::factory<Aa::create>, _1); 
      map["Ab"] = boost::bind(boost::factory<Ab::create>, _1); 
      […] 
      map["Ax"] = boost::bind(boost::factory<Ax::create>, _1); 
     } 

     std::map<std::string, a_fact> map; 
    }; 

当然，它不COM pil ... 给我错误：

MyFactory.cc:13: error: type/value mismatch at argument 1 in template parameter list for ‘template<class Pointer, class Allocator, boost::factory_alloc_propagation AP> class boost::factory’ 
MyFactory.cc:13: error: expected a type, got ‘Aa::create’ 

任何想法，我应该如何实现它？

Answer 1

如果有人进入相同的错误，这里的答案。 它不需要boost::factory工作，直接使用boost::function就足够了。

所以

class MyFactory { 
    public: 
     static MyFactory* getInstance(); 

     typedef boost::function< A(tcp::socket) > a_fact; 

    private: 
     MyFactory() { 
      map["Aa"] = boost::bind(&Aa::create, _1); 
      map["Ab"] = boost::bind(&Ab::create, _1); 
      […] 
      map["Ax"] = boost::bind(&Ax::create, _1); 
     } 

     std::map<std::string, a_fact> map; 
    }; 

伟大的作品！

Answer 2

在documentation传递给factory模板的参数是您期望的指针类型。所以在你的情况下boost::factory<Aa::pointer>。