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

From: Philippe Mori (philippe_mori_at_[hidden])
Date: 2005-01-28 23:10:36

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?

For twice, I use the definition from section 3.3.2.

Philippe