[Boost-users] Re: Exercices 3-3 and 3-4 (C++ Templates Metaprogramming)

From: Aleksey Gurtovoy (agurtovoy_at_[hidden])
Date: 2005-02-02 06:35:31

Philippe Mori writes:
> I'm not sure of the meaning of "twice twice" and "twice on itself"
> respectively.
>
> My guess would be for exercice 3 that I should do something like :
>
>     typedef twice<to_be_filled_1>::type T1;    // T1 would be T **
>
>     // The second time, I replace T (in to_be_fiiled_1) by
>     // T1 (in to_be_filled_2) , thus T2 is T1** which is also T****
>     typedef twice<to_be_filled_2>::type T2;
>
> while for exercice 4, we want something that would look like :
>
>     typdef twice<twice<to_be_filled_3a>to_be_filled_3b>::type T3;   
>
> Does I understand the questions correctly?

Yep.

-- 
Aleksey Gurtovoy
MetaCommunications Engineering