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

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