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我有一个前进减速问题。我之前有一个普通的类,叫做GlobalCWND,它被实例化并在另一个类中使用ProtocolContext

我转发在Requestor.h.

你可以看到这2个类的代码的相关部分。

============协议上下文========

 class Requestor<RequestorStrategy>;
 class Receiver<ReceiverStrategy>;

 class ProtocolContext : public Object
 {
 public:
   ProtocolContext(Ptr<SubscriptionContext> , Ptr<ReceiverStrategy> , Ptr<
       RequestorStrategy> );
.......

 ProtocolContext::ProtocolContext(Ptr<SubscriptionContext> sctx, Ptr<
      ReceiverStrategy> rec, Ptr<RequestorStrategy> req) :
    receiver(rec), requestor(req)
  {
    m_sctx = sctx;
    Ptr<GlobalCWND> m_globalCWND = Create<GlobalCWND> (this);
    cout << "Initializing Protocol Context for rid"
        << m_sctx->GetMetaDataStrategy()->GetRid() << endl;
    m_ph = Create<PacketHandler> (sctx);
  }

=================Requestor.h=========

 class ProtocolContext;

 class RequestorStrategy : public Object
 {

 public:
   RequestorStrategy()
   {
   }
   ;
   ~RequestorStrategy()
   {
   }
   ;
   /* Transitions */
   virtual void
   Trans(Ptr<ProtocolContext> , Ptr<Packet> ) = 0;
 };

.....

它以前工作正常。现在我已将其更改GlobalCWND为虚拟类,并且在协议上下文构造函数中我有以下代码:

ProtocolContext::ProtocolContext(Ptr<SubscriptionContext> sctx, Ptr<
      ReceiverStrategy> rec, Ptr<RequestorStrategy> req) :
    receiver(rec), requestor(req)
  {
    m_sctx = sctx;
    Ptr<GlobalCWND> m_globalCWND = Create<GlobalCWNDSimple> (this);

..............
}

但现在我得到这个错误:

 GlobalCWND.h:21:   instantiated from here
ptr.h:441: error: invalid use of incomplete type ‘struct
ProtocolContext’
Requestor.h:16: error: forward declaration
of ‘struct ProtocolContext’

错误行是:

line 21 of GlobalCWND() is    GlobalCWND (){};
and line 16 of Requestor.h is class ProtocolContext;

Ptr 类实际上是在创建指向对象的指针,ptr.h 的第 441 行是该函数的最后一行:

template <typename T>
Ptr<T>::~Ptr ()
{
 if (m_ptr != 0)
   {
     m_ptr->Unref();
   }
}

开始的代码是GlobalCWND这样的:

 class ProtocolContext;

  class GlobalCWND : public Object
  {
  public:
    GlobalCWND (){};
    GlobalCWND (Ptr<ProtocolContext>){};
    ~GlobalCWND (){};

    static TypeId GetTypeId(){
      static TypeId tid = TypeId("GlobalCWND")
      .SetParent<Object> ()
      ;
      return tid;
    };
4

1 回答 1

2

for 的构造函数GlobalCWND采用Ptr<ProtocolContext>按值,在其析构函数中调用ProtocolContext指针上的方法。
然而,根据错误,ProtocolContext此时是不完整的 - 您需要包含ProtocolContext.
有关不完整类型可以做什么和不能做什么的列表,请参阅此答案

于 2010-07-09T11:48:34.233 回答