[Boost-users] [multi_index] Announcing preview of ranked indices

Subject: [Boost-users] [multi_index] Announcing preview of ranked indices
From: Joaquin M Lopez Munoz (joaquin_at_[hidden])
Date: 2015-04-22 15:34:04

Hi,

It's been 11 years since first proposed, but here it is at last. I'm
releasing a prereview of ranked indices for Boost.MultiIndex:

  struct person
  {
    int         age;
    std::string name;
  };

  typedef multi_index_container<
    person,
    indexed_by<
      ranked_non_unique<member<person,int,&person::age> >,
      ordered_non_unique<member<person,std::string,&person::name>>>>
  multi_t;

  multi_t m={{40,"Joe"},{25,"Jill"},{30,"Kurt"},{32,"Sue"}};

  auto it=m.emplace(31,"Maggie").first;
  std::cout<<m.rank(it)<<" persons younger than "<<it->name<<"\n";

  auto n=m.size()/2;
  std::cout<<n<<" persons are less than "<<m.nth(n)->age<<" years old\n";

Ranked indices add a bunch of extra rank-related capabilities to the
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