Re: [Boost-users] Needs advices on design ( mpl or processor )

Hi Sorry, I have been away from my computer doing the weekend. I'm looking at your suggested code, and the questions you have raised now. I will answer as soon as possible. Best regards Allan W. Nielsen On Sun, Jan 8, 2012 at 7:32 PM, Larry Evans wrote:

On 01/07/12 17:28, Larry Evans wrote:

...

On 01/07/12 02:42, Allan Nielsen wrote: [snip]

...

void example1() {     // As you see, the expresions for calculating the offset get quite long,     // and are not easy to maintain.

Here's where I don't understand why the calculation are done outside the temple and then passed as args to the template. Why not have a template do the calculations and accumulate the results, somewhat like mpl::fold or the code I posted earlier?

...

    C< CompressedEnum,

       CompressedEnum::offset *                             CompressedEnum::size >,

       CompressedEnum

            CompressedEnum::offset *                                  CompressedEnum::size >::offset             *             CompressedEnum::offset *                                  CompressedEnum::size >::size        >     > c1;

}

[snip] The attached code produces output:

:eos_t::offset=9 :get_ol(T1)=2 :get_ol(T2)=0 :get_ol(T3)=0 :get<T3>=0 putting: :get<T1>=0 :get<T2>=1 :get<T3>=2

The output before the putting: lines is caused by the obviously erroneous initialization of the buffer (no Enum e's stored in the buffer, only unsigned ints).  The output after the putting: lines shows the effect of the put(Enum e).

However, be warned! I'm not sure all the casting within the get_ol and put_ol is portable.

Is this about what you want?

I've looked briefly at Vicente's bit_mask library and it looks more complicated; however, that extra complication is probably because it provides extra capabilities.

HTH.

-Larry

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