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fix_alloc.hpp

См. документацию.

/*
 * Copyright (C) Sergey P. Derevyago, 2003-2004.
 *
 * 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 __FIX_ALLOC_HPP__
 #define __FIX_ALLOC_HPP__

#include <stddef.h>

namespace fixed_alloc_private {

 void get_mem(void*& head, size_t type_sz);

 template <size_t SIZE>
 class void_alloc {
       static void* head;

  public:
       static void* alloc()
       {
        if (!head) get_mem(head, SIZE);

        void* ret=head;
        head=*(void**)head;

        return ret;
       }

       static void free(void* ptr)
       {
        *(void**)ptr=head;
        head=ptr;
       }
 };

 template <size_t SIZE>
 void* void_alloc<SIZE>::head;

}

template <class T>
class fixed_alloc {
 public:
      enum { SIZE=(sizeof(T)+sizeof(void*)-1)/sizeof(void*)*sizeof(void*) };

      static T* alloc()
      {
       return (T*)fixed_alloc_private::void_alloc<SIZE>::alloc();
      }

      static void free(void* ptr)
      {
       fixed_alloc_private::void_alloc<SIZE>::free(ptr);
      }
};

class sized_alloc {
  public:
      static void* alloc(size_t size);

      static void free(void* ptr, size_t size);
};

#endif

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