id,summary,reporter,owner,description,type,status,milestone,component,version,severity,resolution,keywords,cc
6282,filter and other views transform the sequence type,Robert Ramey,Joel Falcou,"code such as the following doesn't work.  That is, none of the views can produce a set type sequence.  Note this is diffferent from fusion so it is possible.  I also realize that this is non-trivial enhancement. Oh well.
{{{
    struct a {};
    struct b {};
    struct c {};
    struct d {};
    typedef boost::mpl::set<a, b, c> s1;
    BOOST_CONCEPT_ASSERT(( boost::mpl::AssociativeSequence<s1> ));
    typedef boost::mpl::set<c, d> s2;
    BOOST_CONCEPT_ASSERT(( boost::mpl::AssociativeSequence<s2> ));
    typedef boost::mpl::joint_view<s1, s2>::type sdiff;
    BOOST_CONCEPT_ASSERT(( boost::mpl::AssociativeSequence<sdiff> ));
}}}

I know it's correct as is - that is it works according to they it's described in the manual.  But it was hard to find my mistake.
",Feature Requests,new,To Be Determined,mpl,Boost Release Branch,Optimization,,,