Re: [boost] Class views on an associative container

26 Apr 2006

      Joaquin M Lopez Munoz <joaquin <at> tid.es> writes:
...
Hello,
With a little imagination, you can use Boost.MultiIndex,
and specially the key extraction framework it provides,
to achieve something similar to what you want (if I'm
getting you right):
A small update: actually, you can write type_info_extractor
in a more direct way:

template<typename Base>
struct type_info_extractor
{
  typedef std::type_info result_type;

  const std::type_info& operator()(const Base& x)const
  {
    return typeid(x);
  }
};

because composite_key<> takes care itself of the
chained ptr dereferencing stuff needed to go
from shared_ptr<A> to const A&.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo