Re: [Boost-users] [Multi-Index] has_index<BMI,TAG> meta-function

Dominique Devienne writes:

On Tue, Jul 14, 2009 at 5:49 PM, JOAQUIN M. LOPEZ MUÑOZ

One last question tonight :)

Sorry it's been a little later than that. I've been offline for the last couple of days.

Similarly to how I can now statically enable/disable code based on which index is implemented by a BMI, can one also change that code based on whether the index is unique vs non-unique? Or ordered vs hashed? [...]

Use index_specifier_type_list instead of index_type_list (differences explained at http://tinyurl.com/nwe27r ) and resort to something like this: template<typename IndexSpecifier> struct is_unique_index:boost::mpl::false_{}; template struct is_unique_index< boost::multi_index::ordered_unique

:boost::mpl::true_{};

template struct is_unique_index< boost::multi_index::hashed_unique

:boost::mpl::true_{};

and similarly for ordered vs hashed. Joaquín M López Muñoz Telefónica, Investigación y Desarrollo