src/commons/pool.h

#ifndef COMMONS_POOL_H
#define COMMONS_POOL_H

#include <boost/circular_buffer.hpp>
#include <commons/array.h>

namespace commons {

  using namespace boost;

  template<typename T>
    class pool {
      public:
        pool(int size) : xs(size), ps(size) {
          for (size_t i = 0; i < xs.size(); i++)
            ps.push_back(&xs[i]);
        }

        T *take() {
          check(!ps.empty(), "taking from empty pool");
          T *p = ps[0];
          ps.pop_front();
          return p;
        }

        void drop(T *p) {
          check(ps.size() < ps.max_size(), "dropping into full pool");
          ps.push_back(p);
        }

        size_t size() {
          return ps.size();
        }

      private:
        array<T> xs;
        circular_buffer<T*> ps;
    };

}

#endif

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