#include <iostream>
#include <string>

class IJob;
class IJobPool { public: void Run(IJob *job) {};};

IJobPool *g_aPools[
#define POOL(x,i) 1 +
#include "pools.h"
#undef POOL
0
];

#define POOL(x,i) struct S##x##PoolTag {};
#include "pools.h"
#undef POOL

class IJob {public: using tag = SmainPoolTag; };
class CNormalJob : public IJob {};
class CHttpJob : public IJob {public: using tag = ShttpPoolTag; };


#define POOL(x,i) \
void Run(IJob *job, S##x##PoolTag) \
{ \
    std::cout<<"dispatched to "#x<<std::endl; \
    if(!g_aPools[i]) \
        return; \
    g_aPools[i]->Run(job); \
} \

#include "pools.h"
#undef POOL

template<typename T, typename = std::enable_if_t<std::is_base_of<IJob, T>::value>>
void DispatchJob(T *job) {
    Run(job, typename T::tag());
}


int main(int argc, char **argv)
{
    #define POOL(x,i) \
    IJobPool x##Pool; \
    g_aPools[i] = &x##Pool;
    #include "pools.h"
    #undef POOL

    CNormalJob j1;
    CHttpJob j2;

    DispatchJob(&j1);
    DispatchJob(&j2);

    return 0;
}