Click here to Skip to main content
Click here to Skip to main content
Add your own
alternative version

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.
boost.zip
boost
config
compiler
platform
stdlib
detail
mpl
aux_
config
preprocessed
bcc
bcc551
gcc
msvc60
msvc70
mwcw
no_ctps
no_ttp
plain
preprocessor
range_c
preprocessor
arithmetic
detail
array
comparison
config
control
detail
edg
msvc
detail
facilities
iteration
detail
bounds
iter
list
detail
edg
logical
punctuation
repetition
detail
edg
msvc
selection
seq
detail
slot
detail
tuple
regex
v3
test
detail
included
type_traits
detail
utility
userfun.zip
ATL
release
UserFun.exe
LowLevel
release
LowLevel.exe
2000
release
2000.exe
whoami.zip
Whoami
release
Whoami.exe
//  (C) Copyright John Maddock 2000. 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 BOOST_TT_IS_POLYMORPHIC_HPP
#define BOOST_TT_IS_POLYMORPHIC_HPP

#include <boost/type_traits/is_class.hpp>
#include <boost/type_traits/remove_cv.hpp>
// should be the last #include
#include "boost/type_traits/detail/bool_trait_def.hpp"
#include <boost/detail/workaround.hpp>

namespace boost{
namespace detail{

template <class T>
struct is_polymorphic_imp1
{
# if BOOST_WORKAROUND(__MWERKS__, <= 0x2407) // CWPro7 should return false always.
    typedef char d1, (&d2)[2];
# else 
   typedef typename remove_cv<T>::type ncvT;
   struct d1 : public ncvT
   {
      d1();
#  if !defined(__GNUC__) // this raises warnings with some classes, and buys nothing with GCC
      ~d1()throw();
#  endif 
      char padding[256];
   };
   struct d2 : public ncvT
   {
      d2();
      virtual ~d2()throw();
#  ifndef BOOST_MSVC
      // for some reason this messes up VC++ when T has virtual bases:
      virtual void foo();
#  endif
      char padding[256];
   };
# endif 
   BOOST_STATIC_CONSTANT(bool, value = (sizeof(d2) == sizeof(d1)));
};

template <class T>
struct is_polymorphic_imp2
{
   BOOST_STATIC_CONSTANT(bool, value = false);
};

template <bool is_class>
struct is_polymorphic_selector
{
   template <class T>
   struct rebind
   {
      typedef is_polymorphic_imp2<T> type;
   };
};

template <>
struct is_polymorphic_selector<true>
{
   template <class T>
   struct rebind
   {
      typedef is_polymorphic_imp1<T> type;
   };
};

template <class T>
struct is_polymorphic_imp
{
   typedef is_polymorphic_selector< ::boost::is_class<T>::value> selector;
   typedef typename selector::template rebind<T> binder;
   typedef typename binder::type imp_type;
   BOOST_STATIC_CONSTANT(bool, value = imp_type::value);
};

} // namespace detail

BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_polymorphic,T,::boost::detail::is_polymorphic_imp<T>::value)

} // namespace boost

#include "boost/type_traits/detail/bool_trait_undef.hpp"

#endif

By viewing downloads associated with this article you agree to the Terms of Service and the article's licence.

If a file you wish to view isn't highlighted, and is a text file (not binary), please let us know and we'll add colourisation support for it.

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Share

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 | :) .

| Advertise | Privacy | Mobile
Web02 | 2.8.140814.1 | Last Updated 27 Jun 2005
Article Copyright 2005 by oshah
Everything else Copyright © CodeProject, 1999-2014
Terms of Service
Layout: fixed | fluid