Why CAsyncSocket does not have copy constructor or = operator?

Question

I have inhereted CAsyncSocket and wanted to pass the objects around.

 class ClientSocket : public CAsyncSocket
{
CAsyncSocket nitSocket;
    public:
ClientSocket(void);
virtual ~ClientSocket(void);
 };

I get sevaral compile errors when i do

 void SomeOtherClass::func(ClientSocket &socket)
     this->socket = socket;
 }

Error:

'CAsyncSocket::operator =' : cannot access private member declared in class          'CAsyncSocket'

I looked into file and found

private:
CAsyncSocket(const CAsyncSocket& rSrc);    // no implementation
void operator=(const CAsyncSocket& rSrc);  // no implementation

Should i make my copy constructor but since there is no implementation for base class would my code crash at runtime.

Important: Should i make a copy ? WOULD my new object receive the events of original object?

I don't believe Winsock supports a `dup()` operation. Just change your socket member to be a reference. — user207421, Aug 15 '12 at 10:57

score 0 · Answer 1 · edited May 23 '17 at 11:48

0

Polymorphic types in C++ are usually made non-copyable because taking a copy of base class easily leads to slicing.

edited May 23 '17 at 11:48

Community

answered Aug 16 '12 at 12:32

Nikolai Fetissov

@Fetissov Please answer my questions at the end of body . – Ashish Negi Aug 20 '12 at 06:24
I'm not at all skilled in broken Windows APIs, but I don't believe just taking a copy of a C++ object makes it receive original networking events. – Nikolai Fetissov Aug 20 '12 at 12:46
@Fetissov What about for non-copyable Classes, if i want to derive a class and want to write a copy constructor . How to do it in most efficient way ? – Ashish Negi Aug 20 '12 at 14:23
if windows api is broken what should i use for windows platform ? – Ashish Negi Aug 20 '12 at 14:23
@Ashish, that's the point - you *don't* write a copy constructor for a sub-type of "non-copyable", because it's supposed to be used via pointer/reference and not by value. – Nikolai Fetissov Aug 20 '12 at 14:27

1 Answers1