Re: [boost] Proposal: Linear map

Subject: Re: [boost] Proposal: Linear map
From: Andrey Semashev (andrey.semashev_at_[hidden])
Date: 2012-07-18 11:12:11

On Wednesday 18 July 2012 08:01:09 Amir Ansari wrote:
> >> 2. Is there some specialization for flat_set with the same semantics as
> >> ptr_vector ?
> >
> >I'm not sure I understand. Do you intend to store pointers in flat_set? If
> >so, you can store std::unique_ptr's or shared_ptr's and specify your
> >custom ordering predicate to order pointers by their pointees.
> 
> The documentation for boost::ptr_vector says that using the smart pointers
> inside a vector isn't ideal... it's one of the reasons why ptr_vector
> exists. I was wondering if that logic applies still when flat_set holds
> pointers and is there a solution available?

If you have unique_ptr, standard containers can hold exclusive pointers, which 
practically defeats the efficiency penalty of storing shared_ptr's. Pointer 
containers also provide other features but if all you need is store pointers 
in containers, unique_ptr and STL containers are enough. The same applies to 
flat_set.