message.hxx

这是国外的resip协议栈

#ifndef RESIP_Message_hxx
#define RESIP_Message_hxx 

#include "rutil/Data.hxx"
#include <iosfwd>

namespace resip
{
class TransactionUser;

/**
   @ingroup resip_crit
   @brief The base-class used for message-passing.
*/
class Message 
{
   public:
      Message();
      virtual ~Message() {}

      /// facet for brief output to streams
      class Brief
      {
         public:
            Brief(const Message& src);
            const Message& mSource;
      };

      /// return a facet for brief encoding of message
      Brief brief() const;
      virtual Message* clone() const = 0;
      /// output the entire message to stream
      virtual std::ostream& encode(std::ostream& strm) const = 0;
      /// output a brief description to stream
      virtual std::ostream& encodeBrief(std::ostream& str) const = 0;

   protected:
      friend class TuSelector;      
      friend class TransactionState;
      friend class SipStack;
      bool hasTransactionUser() const { return tu != 0; }
      void setTransactionUser(TransactionUser* t) { tu = t; }
      TransactionUser* getTransactionUser() { return tu; }
      TransactionUser* tu;      
};

std::ostream& 
operator<<(std::ostream& strm, const Message& msg);

std::ostream& 
operator<<(std::ostream& strm, const Message::Brief& brief);

}

#endif

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