[boost] [Daniel Frey][Trac Policy] #979: ::boost::detail::empty_base could be improved

From: David Abrahams (dave_at_[hidden])
Date: 2007-05-23 06:39:40

I need to assign this ticket to Daniel Frey, who is the maintainer of
the operators library.  Does he have a Trac account?

I don't know who "daniel" is in the list of Trac users.  Maybe, for a
project this size, we ought to be using userids that we can
definitively associate with a person.


attached mail follows:

#979: ::boost::detail::empty_base could be improved
-------------------------------+--------------------------------------------
 Reporter:  sparent_at_[hidden]  |        Type:  Bugs            
   Status:  new                |   Milestone:  Boost 1.34.1    
Component:  iterator           |     Version:  release 1.34.0  
 Severity:  Problem            |    Keywords:  operator library
-------------------------------+--------------------------------------------
 The empty base class used by the operators library will not actually be
 empty if you have a class inheriting from operators and the first member
 also inherits from operators - the work around is to have an empty_base<T>
 to ensure a unique type - so you end up with:

 class my_class : equality_comparable<my_class, my_class,
 empty_base<my_class> >
 { ...

 Kind of gross - such a base could be included directly in the operator
 library.

 Sean

-- 
Ticket URL: <http://svn.boost.org/trac/boost/ticket/979>
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-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com