itk_alloc.h

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/*=========================================================================

  Program:   Insight Segmentation & Registration Toolkit
  Module:    $RCSfile: itk_alloc.h,v $
  Language:  C++
  Date:      $Date: 2009-02-05 19:05:01 $
  Version:   $Revision: 1.5 $

  Copyright (c) Insight Software Consortium. All rights reserved.
  See ITKCopyright.txt or http://www.itk.org/HTML/Copyright.htm for details.

     This software is distributed WITHOUT ANY WARRANTY; without even 
     the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR 
     PURPOSE.  See the above copyright notices for more information.

=========================================================================*/
#ifndef __itk_alloc_h
#define __itk_alloc_h

// That is an adaptor for working with any alloc provided below
template<class T, class Alloc>
class itk_simple_alloc {
  typedef Alloc alloc_type;
public:
  typedef typename Alloc::value_type alloc_value_type; // awf
  typedef T value_type;

#if !__STL_EAGER_TYPECHECK
  enum {
    chunk = sizeof(value_type)/sizeof(alloc_value_type)+(sizeof(value_type)%sizeof(alloc_value_type)>0)
  };
#else
  // note: any out-of-line template definitions will not see this.
#define chunk (sizeof(value_type)/sizeof(alloc_value_type)+(sizeof(value_type)%sizeof(alloc_value_type)>0))
#endif

  static value_type *allocate(size_t n)
    { return 0 == n? 0 : (value_type*) alloc_type().allocate(n * chunk, 0); }
  static value_type *allocate(void)
    { return (value_type*) alloc_type().allocate(chunk, 0); }
  static void deallocate(value_type *p, size_t n)
    { if (0 != n) alloc_type().deallocate(p, n * chunk); }
  static void deallocate(value_type *p)
    { alloc_type().deallocate((char*)p, chunk); }
  
#undef chunk
};
#endif