C++???????????????

???????????? ???????[ 2013/2/27 10:00:57 ] ????????

????????????????СС?????????o??????????????????????????????????????????????????

1 e.addHandler(ref(f2));
2 e.addHandler(ref(*pf2)); // pf2?????f2?????

??????????÷o??????????????β??????????ü?????????ο?????Lambda??????????????

???????

????1??????????bind?????????鷳?????addhandler???????

template<class ObjT?? class FuncT> int addHandler(ObjT obj?? FuncT func)
         {
             using namespace std::placeholders;
             m_handlers.emplace(m_handlerId?? std::bind(func?? std::forward<ObjT>(obj)?? _1?? _2));
             return m_handlerId++;
         }

????2?????????????????б??????????????￡?

struct NullType {};

template<class P1 = Private::NullType?? class P2 = Private::NullType>
class Event
{
public:
     template<class ObjT?? class FuncT> int addHandler(ObjT obj?? FuncT func)
     {
         using namespace std::placeholders;
         m_handlers.emplace(m_handlerId?? std::bind(func?? std::forward<ObjT>(obj)?? _1?? _2));
         return m_handlerId++;
     }

     void operator ()(P1 arg1?? P2 arg2)
     {
         for ( const auto& i : m_handlers )
             i.second(arg1?? arg2);
     }
};

template<>
class Event<Private::NullType?? Private::NullType>
{
public:
     template<class ObjT?? class FuncT> int addHandler(ObjT obj?? FuncT func)
     {
         using namespace std::placeholders;
         m_handlers.emplace(m_handlerId?? std::bind(func?? std::forward<ObjT>(obj)));
         return m_handlerId++;
     }

     void operator ()()
     {
         for ( const auto& i : m_handlers )
             i.second();
     }
};

template<class P1>
class Event<P1?? Private::NullType>
{
public:
     template<class ObjT?? class FuncT> int addHandler(ObjT obj?? FuncT func)
     {
         using namespace std::placeholders;
         m_handlers.emplace(m_handlerId?? std::bind(func?? std::forward<ObjT>(obj)?? _1));
         return m_handlerId++;
     }

     void operator ()(P1 arg1)
     {
         for ( const auto& i : m_handlers )
             i.second(arg1);
     }
};