Hi James, A typelist is, well, a list of types :) One easy way to create a list of types is to use std::pair to create a lisp-style list. Suppose I want to create a list of three types: int, char, and std::string. typedef std::pair< int, std::pair > > MyTypeList; The nil at the end is a type to mark the end of the list. I can access the first thing in the list like this: MyTypeList::first_type I can access the second thing in the list like this: MyTypeList::second_type::first_type In general, one uses recursive algorithms to manipulate these kinds of lists. You can write template metaprograms for these recursive algorithms. Horrors! :) (I do it all the time, its fun!) Cheers, Jeremy On 11/27/01 11:40 PM, "jamescurran@mvps.org" wrote:

Over on the Boost Developer group, there a lot of talk about how to best implement a typelist. Just so I can follow that discussion, could someone give me the basic thumbnail sketch of what exactly a typelist is, and what they are used for?

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-- Jeremy Siek http://www.osl.iu.edu/~jsiek Ph.D. Student, Indiana Univ. B'ton email: jsiek@osl.iu.edu C++ Booster (http://www.boost.org) office phone: (812) 855-3608