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The Windows Access Control Model: Part 2

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27 Jun 2005CPOL43 min read 244.3K   7.2K   113  
This second part of the Access Control series will program with the basic Access Control structures.
// preprocessed version of 'boost/mpl/aux_/advance_forward.hpp' header
// see the original for copyright information

namespace boost {
namespace mpl {
namespace aux {

template< nttp_long N > struct advance_forward;

template<>
struct advance_forward<0>
{
    template< typename Iterator > struct apply
    {
        typedef Iterator iter0;
        typedef iter0 type;
    };

    // ETI workaround
    template<> struct apply<int>
    {
        typedef int type;
    };

};

template<>
struct advance_forward<1>
{
    template< typename Iterator > struct apply
    {
        typedef Iterator iter0;
        typedef typename iter0::next iter1;
        typedef iter1 type;
    };

    // ETI workaround
    template<> struct apply<int>
    {
        typedef int type;
    };

};

template<>
struct advance_forward<2>
{
    template< typename Iterator > struct apply
    {
        typedef Iterator iter0;
        typedef typename iter0::next iter1;
        typedef typename iter1::next iter2;
        typedef iter2 type;
    };

    // ETI workaround
    template<> struct apply<int>
    {
        typedef int type;
    };

};

template<>
struct advance_forward<3>
{
    template< typename Iterator > struct apply
    {
        typedef Iterator iter0;
        typedef typename iter0::next iter1;
        typedef typename iter1::next iter2;
        typedef typename iter2::next iter3;
        typedef iter3 type;
    };

    // ETI workaround
    template<> struct apply<int>
    {
        typedef int type;
    };

};

template<>
struct advance_forward<4>
{
    template< typename Iterator > struct apply
    {
        typedef Iterator iter0;
        typedef typename iter0::next iter1;
        typedef typename iter1::next iter2;
        typedef typename iter2::next iter3;
        typedef typename iter3::next iter4;
        typedef iter4 type;
    };

    // ETI workaround
    template<> struct apply<int>
    {
        typedef int type;
    };

};

template< nttp_long N > 
struct advance_forward
{
    template< typename Iterator > struct apply
    {
        typedef typename apply1< advance_forward<4>,Iterator >::type chunk_result_;
        typedef typename apply1<advance_forward<( (N - 4) < 0 ? 0 : N - 4 )>,chunk_result_>::type type;
    };
};

} // namespace aux
} // namespace mpl
} // namespace boost

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


Written By
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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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