#include "tbb/parallel_for.h"
#include "tbb/task_scheduler_init.h"
#include <iostream>
#include <vector>

struct mytask {
   mytask(size_t n)
   :_n(n)
   {}
   void operator()() {
      for (int i=0;i<1000000;++i) {}  // Deliberately run slow
      std::cerr << "[" << _n << "]";
   }
   size_t _n;
};

int main(int,char**) {

   //tbb::task_scheduler_init init;  // Automatic number of threads
   tbb::task_scheduler_init init(tbb::task_scheduler_init::default_num_threads());  // Explicit number of threads

   std::vector<mytask> tasks;
   for (int i=0;i<1000;++i)
      tasks.push_back(mytask(i));

   tbb::parallel_for(
                     tbb::blocked_range<size_t>(0,tasks.size()),
                     [&tasks](const tbb::blocked_range<size_t>& r) {
                        for (size_t i=r.begin();i<r.end();++i) tasks[i]();
                     }
                     );
   
   std::cerr << std::endl;
   
   return 0;
}