mem_pool.hpp

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/*
 * Copyright (C) Sergey P. Derevyago, 2008-2009.
 *
 * Permission to copy, use, modify, sell and distribute this software is granted
 * provided this copyright notice appears in all copies.
 * This software is provided "as is" without express or implied warranty, and
 * with no claim as to its suitability for any purpose.
 *
 */

#ifndef __DERS__MEM_POOL_HPP__
#define __DERS__MEM_POOL_HPP__

#include <ders/config.hpp>
#include <new>
#include <stddef.h>

namespace ders {  // ::ders

class mem_pool {
      void* impl;

      mem_pool(const mem_pool&);
      mem_pool& operator=(const mem_pool&);

 public:
      mem_pool(size_t max_chunk_size=2*1024, size_t min_objs_in_chunk=4);
      ~mem_pool();

      void* allocate(size_t size);
      void deallocate(void* ptr, size_t size);
};

template<class T>
class mp_newbuf {
      mem_pool& mp;
      void* ptr;

      mp_newbuf(const mp_newbuf&);
      mp_newbuf& operator=(const mp_newbuf&);

 public:
      explicit mp_newbuf(mem_pool& m) : mp(m), ptr(m.allocate(sizeof(T))) {}
      ~mp_newbuf() { if (ptr) mp.deallocate(ptr, sizeof(T)); }

      mem_pool& pool() const { return mp; }
      void* get() const { return ptr; }
      T* rls(T* p) { ptr=0; return p; }
};

}  // namespace ::ders

#endif  // __DERS__MEM_POOL_HPP__

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