AspectC++ Mixing functional and interaction code

consumer.h

#ifndef __CONSUMER_H__
#define __CONSUMER_H__

#include <algorithm>
#include <iostream>
#include <vector>

typedef int TimeSlot;

class Consumer {
public:
    std::vector<TimeSlot> mSlots;
    
    TimeSlot reserveSlot() {
        for(TimeSlot slot = 0; slot<1000;slot++) {
            if (isTimeSlotAvailable(slot)) {
                mSlots.push_back(slot);
                return slot;
            }
        }
		return 0;
    }
    
    bool isTimeSlotAvailable(TimeSlot slot) {
		for(std::vector<TimeSlot>::size_type i = 0; i != mSlots.size(); i++) {
			TimeSlot personalSlot = mSlots[i];
            if (slot == personalSlot) return false;
        }
        return true;
    }
};

#endif

main.cc

#include "consumer.h"

using namespace std;

int main()
{
    Consumer c1, c2, c3;
    
    cout << "Reserving c1 slot #" << c1.reserveSlot() << endl;
    cout << "Reserving c1 slot #" << c1.reserveSlot() << endl;
    
    cout << "Reserving c2 slot #" << c2.reserveSlot() << endl;
    cout << "Reserving c2 slot #" << c2.reserveSlot() << endl;
    
    cout << "Reserving c3 slot #" << c3.reserveSlot() << endl;
    cout << "Reserving c3 slot #" << c3.reserveSlot() << endl;
    
    return 0;
}

mediator.ah

#ifndef __MEDIATOR_AH__
#define __MEDIATOR_AH__

#include "consumer.h"

aspect ConsumerMediator {
	std::vector<Consumer*> mInstances;
	
	advice construction("Consumer") : after() {
		mInstances.push_back(tjp->that());
	}
	
	advice destruction("Consumer") : before() {
		mInstances.erase(std::remove(mInstances.begin(), mInstances.end(), tjp->that()), mInstances.end());
	}
	
	//Intercept the isTimeSlotAvailable to instead loop over all existing instances
	advice call("% Consumer::isTimeSlotAvailable(...)") && within("% Consumer::reserveSlot(...)") : around() {
		TimeSlot* slot = (TimeSlot*)tjp->arg(0);
		bool result = true;
		for(std::vector<Consumer*>::size_type i = 0; i != mInstances.size(); i++) {
			Consumer* c = mInstances[i];
			if (!c->isTimeSlotAvailable(*slot)) {
				result = false;
				break;
			}
		}
		tjp->result()[0] = result;
	}
};

#endif