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The Windows Access Control Model: Part 2

, 27 Jun 2005 CPOL
This second part of the Access Control series will program with the basic Access Control structures.
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//  (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.

//  See http://www.boost.org/libs/static_assert for documentation.

/*
 Revision history:
   02 August 2000
      Initial version.
*/

#ifndef BOOST_STATIC_ASSERT_HPP
#define BOOST_STATIC_ASSERT_HPP

#include <boost/config.hpp>

#ifdef __BORLANDC__
//
// workaround for buggy integral-constant expression support:
#define BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS
#endif

namespace boost{

// HP aCC cannot deal with missing names for template value parameters
template <bool x> struct STATIC_ASSERTION_FAILURE;

template <> struct STATIC_ASSERTION_FAILURE<true> { enum { value = 1 }; };

// HP aCC cannot deal with missing names for template value parameters
template<int x> struct static_assert_test{};

}

//
// Implicit instantiation requires that all member declarations be
// instantiated, but that the definitions are *not* instantiated.
//
// It's not particularly clear how this applies to enum's or typedefs;
// both are described as declarations [7.1.3] and [7.2] in the standard,
// however some compilers use "delayed evaluation" of one or more of
// these when implicitly instantiating templates.  We use typedef declarations
// by default, but try defining BOOST_USE_ENUM_STATIC_ASSERT if the enum
// version gets better results from your compiler...
//
// Implementation:
// Both of these versions rely on sizeof(incomplete_type) generating an error
// message containing the name of the incomplete type.  We use
// "STATIC_ASSERTION_FAILURE" as the type name here to generate
// an eye catching error message.  The result of the sizeof expression is either
// used as an enum initialiser, or as a template argument depending which version
// is in use...
// Note that the argument to the assert is explicitly cast to bool using old-
// style casts: too many compilers currently have problems with static_cast
// when used inside integral constant expressions.
//
#if !defined(BOOST_BUGGY_INTEGRAL_CONSTANT_EXPRESSIONS) && !defined(__MWERKS__)

#if defined(BOOST_MSVC)
// __LINE__ macro broken when -ZI is used see Q199057
// fortunately MSVC ignores duplicate typedef's.
#define BOOST_STATIC_ASSERT( B ) \
   typedef ::boost::static_assert_test<\
      sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)\
      > boost_static_assert_typedef_
#elif defined(BOOST_INTEL_CXX_VERSION)
// agurt 15/sep/02: a special care is needed to force Intel C++ issue an error 
// instead of warning in case of failure
# define BOOST_STATIC_ASSERT( B ) \
    typedef char BOOST_JOIN(boost_static_assert_typedef_, __LINE__) \
        [ ::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >::value ]
#else
// generic version
#define BOOST_STATIC_ASSERT( B ) \
   typedef ::boost::static_assert_test<\
      sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >)>\
         BOOST_JOIN(boost_static_assert_typedef_, __LINE__)
#endif

#else
// alternative enum based implementation:
#define BOOST_STATIC_ASSERT( B ) \
   enum { BOOST_JOIN(boost_static_assert_enum_, __LINE__) \
      = sizeof(::boost::STATIC_ASSERTION_FAILURE< (bool)( B ) >) }
#endif


#endif // BOOST_STATIC_ASSERT_HPP

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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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