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The Windows Access Control Model: Part 2

, 27 Jun 2005
This second part of the Access Control series will program with the basic Access Control structures.
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/*
 *
 * Copyright (c) 2001
 * Dr John Maddock
 *
 * Permission to use, copy, modify, distribute and sell this software
 * and its documentation for any purpose is hereby granted without fee,
 * provided that the above copyright notice appear in all copies and
 * that both that copyright notice and this permission notice appear
 * in supporting documentation.  Dr John Maddock makes no representations
 * about the suitability of this software for any purpose.
 * It is provided "as is" without express or implied warranty.
 *
 */

#ifndef BOOST_DETAIL_ALLOCATOR_HPP
#define BOOST_DETAIL_ALLOCATOR_HPP

#include <boost/config.hpp>
#include <cstdlib>
#if defined(BOOST_NO_STDC_NAMESPACE)
namespace std{
using ::ptrdiff_t;
using ::size_t;
}
#endif

// see if we have SGI alloc class:
#if defined(BOOST_NO_STD_ALLOCATOR) && (defined(__SGI_STL_PORT) || defined(_STLPORT_VERSION) || defined(__GLIBCPP__) || defined(__STL_CONFIG_H))
#  define BOOST_HAVE_SGI_ALLOCATOR
#  include <memory>
#  if defined(__SGI_STL_PORT) || defined(_STLPORT_VERSION)
namespace boost{ namespace detail{
   typedef std::__sgi_alloc alloc_type;
}}
#  else
namespace boost{ namespace detail{
   typedef std::alloc alloc_type;
}}
#  endif
#endif


namespace boost{ namespace detail{

template <class T>
void allocator_construct(T* p, const T& t)
{ new (p) T(t); }

template <class T>
void allocator_destroy(T* p)
{ 
   (void)p; // warning suppression
   p->~T(); 
}

} }

#if !defined(BOOST_NO_STD_ALLOCATOR)

#include <memory>

#define BOOST_DEFAULT_ALLOCATOR(T) std::allocator< T >

namespace boost{ namespace detail{

template <class T, class A>
struct rebind_allocator
{
   typedef typename A::template rebind<T> binder;
   typedef typename binder::other type;
};

} // namespace detail
} // namespace boost

#elif !defined(BOOST_NO_MEMBER_TEMPLATES)

// no std::allocator, but the compiler supports the necessary syntax,
// write our own allocator instead:

#define BOOST_DEFAULT_ALLOCATOR(T) ::boost::detail::allocator< T >

namespace boost{ namespace detail{

template <class T>
class allocator
{
public:

   typedef T              value_type;
   typedef value_type *   pointer;
   typedef const T*       const_pointer;
   typedef T&             reference;
   typedef const T&       const_reference;
   typedef std::size_t    size_type;
   typedef std::ptrdiff_t difference_type;

   template <class U>
   struct rebind
   {
      typedef allocator<U> other;
   };

   allocator(){}
   
   template <class U>
   allocator(const allocator<U>&){}

   allocator(const allocator&){}

   template <class U>
   allocator& operator=(const allocator<U>&)
   { return *this; }

   ~allocator(){}

   pointer address(reference x) { return &x; }

   const_pointer address(const_reference x) const { return &x; }

   pointer allocate(size_type n, const void* = 0) 
   {
      #ifdef BOOST_HAVE_SGI_ALLOCATOR
      return n != 0 ?
         reinterpret_cast<pointer>(alloc_type::allocate(n * sizeof(value_type)))
         : 0;
      #else
      return n != 0 ?
         reinterpret_cast<pointer>(::operator new(n * sizeof(value_type)))
         : 0;
      #endif
   }

   void deallocate(pointer p, size_type n) 
   {
      #ifdef BOOST_HAVE_SGI_ALLOCATOR
      assert( (p == 0) == (n == 0) );
      if (p != 0)
         alloc_type::deallocate((void*)p, n);
      #else
      assert( (p == 0) == (n == 0) );
      if (p != 0)
         ::operator delete((void*)p);
      #endif
   }

   size_type max_size() const
   { return size_t(-1) / sizeof(value_type); }

   void construct(pointer p, const T& val) const
   { allocator_construct(p, val); }

   void destroy(pointer p) const
   { allocator_destroy(p); }
};

template <class T, class A>
struct rebind_allocator
{
   typedef typename A::template rebind<T> binder;
   typedef typename binder::other type;
};

} // namespace detail
} // namespace boost

#else

// no std::allocator, use workaround version instead,
// each allocator class must derive from a base class
// that allocates blocks of bytes:

#define BOOST_DEFAULT_ALLOCATOR(T) ::boost::detail::allocator_adapter<T, ::boost::detail::simple_alloc>

namespace boost{ namespace detail{

class simple_alloc
{
public:

   typedef void           value_type;
   typedef value_type *   pointer;
   typedef const void*    const_pointer;
   typedef std::size_t    size_type;
   typedef std::ptrdiff_t difference_type;

   simple_alloc(){}
   simple_alloc(const simple_alloc&){}

   ~simple_alloc(){}

   pointer allocate(size_type n, const void* = 0) 
   {
      #ifdef BOOST_HAVE_SGI_ALLOCATOR
      return n != 0 ?
         reinterpret_cast<pointer>(alloc_type::allocate(n))
         : 0;
      #else
      return n != 0 ?
         reinterpret_cast<pointer>(::operator new(n))
         : 0;
      #endif
   }

   void deallocate(pointer p, size_type n) 
   {
      #ifdef BOOST_HAVE_SGI_ALLOCATOR
      assert( (p == 0) == (n == 0) );
      if (p != 0)
         alloc_type::deallocate((void*)p, n);
      #else
      assert( (p == 0) == (n == 0) );
      if (p != 0)
         ::operator delete((void*)p);
      #endif
   }
};

template <class T, class Base>
class allocator_adapter : public Base
{
public:

   typedef T              value_type;
   typedef value_type *   pointer;
   typedef const T*       const_pointer;
   typedef T&             reference;
   typedef const T&       const_reference;
   typedef size_t         size_type;
   typedef std::ptrdiff_t difference_type;
   typedef Base      base_type;

   allocator_adapter(){}
   allocator_adapter(const base_type& x) : Base(x){}
   allocator_adapter& operator=(const base_type& x)
   {
      *(static_cast<base_type*>(this)) = x;
      return *this;
   }

   ~allocator_adapter(){}

   pointer address(reference x) { return &x; }

   const_pointer address(const_reference x) const { return &x; }

   pointer allocate(size_type n, const void* = 0) 
   {
      return n != 0 ?
         reinterpret_cast<pointer>(base_type::allocate(n * sizeof(value_type)))
         : 0;
   }

   void deallocate(pointer p, size_type n) 
   {
      assert( (p == 0) == (n == 0) );
      if (p != 0)
         static_cast<base_type*>(this)->deallocate((void*)p, n * sizeof(value_type));
   }

   size_type max_size() const
   { return size_t(-1) / sizeof(value_type); }

   void construct(pointer p, const T& val) const
   { allocator_construct(p, val); }

   void destroy(pointer p) const
   { allocator_destroy(p); }
};

template <class T, class A>
struct rebind_allocator
{
   typedef allocator_adapter<T, typename A::base_type> type;
};

} // namespace detail
} // namespace boost

#endif

#endif // include guard

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About the Author

oshah
Web Developer
United States United States
Mr. Shah is a reclusive C++/C# developer lurking somewhere in the depths of the city of London. He learnt physics at Kings' College London and obtained a Master in Science there. Having earned an MCAD, he teeters on the brink of transitioning from C++ to C#, unsure of which language to jump to. Fortunately, he also knows how to use .NET interop to merge code between the two languages (which means he won't have to make the choice anytime soon).
 
His interests (apart from programming) are walking, football (the real one!), philosophy, history, retro-gaming, strategy gaming, and any good game in general.
 
He maintains a website / blog / FAQ / junk at shexec32.serveftp.net, where he places the best answers he's written to the questions you've asked. If you can find him, maybe you can hire Mr. Shah to help you with anything C++[/CLI]/C#/.NET related Smile | :) .

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