Re: [Boost-bugs] [Boost C++ Libraries] #3438: node algorithms not usable with custom pointer types

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #3438: node algorithms not usable with custom pointer types
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2009-09-12 17:07:34

#3438: node algorithms not usable with custom pointer types
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 Reporter:  anonymous     |       Owner:  igaztanaga
     Type:  Bugs          |      Status:  new       
Milestone:  Boost 1.41.0  |   Component:  intrusive 
  Version:  Boost 1.38.0  |    Severity:  Problem   
 Keywords:                |  
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Comment(by anonymous):

 why should it be constructible from 0?
 I know that the intrusive containers are only supposed to support certain
 types of pointers as their VoidPointer, but the algorithms don't have that
 restriction.
 not all pointer types want to be like raw pointers and are constructible
 from raw pointers.
 in fact, shared_ptr is not constructible from 0. (just an example, I'm not
 trying to use shared_ptrs).
 it does accept raw pointers, but not 0, as a template<class Y>
 shared_ptr(Y *) is not instantiated for 0.

 and the node algorithms can go far beyond using pointers. e.g. you could
 use file offsets as pointer types, with 0 being a valid offset, to build a
 tree that resides in a file.
 and it's a very easy fix with no downsides.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/3438#comment:3>
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