On Thu, Jun 11, 2009 at 1:36 AM, JOAQUIN M. LOPEZ MUÑOZ<joaquin@tid.es> wrote:
Currently, the default Sequence template arg is
class Sequence = fusion::vector< detail::default_hash<0>, detail::default_hash<1>, detail::default_hash<2> >
which implies the default K is 3. I propose to generalize this a bit so that we have something like
template<typename K> default_hash_sequence...;
such that default_hash_sequence<K> is the fusion sequence default_hash<0>,...,default_hash<K-1> (I don't know Fusion but I'm sure this can be done) and then put
class Sequence = default_hash_sequence<3>
So, a user can easily set
bloom_filter<foo,default_hash_sequence<K> >
with a K other than 3.
This makes sense, I like it! Why didn't I think of that earlier? :-D I think I can try my hand at making something like this, or at least have a metafunction default_hash_sequence_generator<K> that has a nested ::type that returns the actual fusion sequence. I think I can do some manual recursion with types, then just reach into it as the default template parameter: template <class Input, class Sequence = typename default_hash_sequence_generator<3>::type, ...> struct bloom_filter; This should be easily done if I know my Fusion well enough. ;-) Thanks for the suggestion, let me make this happen sooner than later. :-D -- Dean Michael Berris | Software Engineer, Friendster, Inc. blog.cplusplus-soup.com | twitter.com/mikhailberis | linkedin.com/in/mikhailberis | profiles.friendster.com/mikhailberis | deanberris.com