can't allocate an object of abstract type [INET error]

[Hanuma Chitti]

Hello all,

I am trying to implement a queuing algorithm using INET framework in Omnet++ 4.2

I have implemented an algo [MyAlgo which is derived from PassiveQueueBase] and implemented all virtual functions those are present in PassiveQueueBase class.
-------------------------------
Define_Module(MyAlgo);
void MyAlgo::initialize()
{
PassiveQueueBase::initialize();
.....
}
bool MyAlgo::enqueue(cMessage *msg)
{.....
}
cMessage *MyAlgo::dequeue()
{.....
}
bool MyAlgo::isEmpty()
{....
}
void MyAlgo::sendOut(cMessage *msg)
{
    send(msg, outGate);
}
-----------------------------
While I do build, I keep getting an error "can't allocate object of abstract data type" pointing to "Define_Module(MyAlgo);"

Could you please let me know the problem if you have any idea about this.

Thanks in advance.
Regards
Sri

[Rudolf Hornig]

In my codebase PassiveQueueBase contains:

virtual cMessage *enqueue(cMessage *msg) = 0;

i.e. the return value is not bool as in your code.

Rudolf

[Hanuma Chitti]

Thanks a lot Rudolf.

It helped. But I had another problem with INET_API. I have seen your reply in another post in this forum to add a header "INETDefs.h" and "make makefiles". But still having an error.
MyAlgo.h
-------------
#ifndef __INET_MYALGO_H_
#define __INET_MYALGO_H_

#include <omnetpp.h>
#include "INETDefs.h"
#include "PassiveQueueBase.h"
#include <IPassiveQueue.h>

class INET_API MyAlgo : public PassiveQueueBase
{
Protected:
virtual void initialize();
..
..
virtual void finish();
};
#endif
--------------
I am getting the error like:
out/gcc-debug//MyAlgo.o: In function `MyAlgo':
H:\Simulator\omnetpp-4.2.2\samples\coalg/MyAlgo.h:18: undefined reference to `_imp___ZTV6MyAlgo'
H:\Simulator\omnetpp-4.2.2\samples\coalg/MyAlgo.h:18: undefined reference to `_imp___ZTV6MyAlgo'
out/gcc-debug//MyAlgo.o: In function `~MyAlgo':
H:\Simulator\omnetpp-4.2.2\samples\coalg/MyAlgo.h:18: undefined reference to `_imp___ZTV6MyAlgo'
H:\Simulator\omnetpp-4.2.2\samples\coalg/MyAlgo.h:18: undefined reference to `_imp___ZTV6MyAlgo'
collect2: ld returned 1 exit status
make: *** [out/gcc-debug//coalg.exe] Error 1
--------------

Please provide some hints if you see that I am missing some logic.

[Alfonso Ariza Quintana]

The undefined references are the constructor and destructor of the class, you should check both methods

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