Re: [Boost-users] BOOST_FOREACH with Index

Subject: Re: [Boost-users] BOOST_FOREACH with Index
From: Eric Niebler (eric_at_[hidden])
Date: 2009-12-13 21:27:37

Nat Goodspeed wrote:
> Eric Niebler wrote:
> 
>>>>     Why not:
>>>>
>>>>      int index = 0;
>>>>
>>>>      BOOST_FOREACH(const Foo &f, foos)
>>>>      {
>>>>        // ... stuff ...
>>>>        ++index;
>>>>      }
> 
>> What value BOOST_FOREACH has comes primarily from its ability to 
>> simplify something that's already pretty darn simple -- a plain 
>> for(;;) loop. I strongly resist any effort to make BOOST_FOREACH more 
>> complicated, unless the wins are truly significant. In this case, I 
>> don't think they are.
> 
> Maybe this shouldn't be a BOOST_FOREACH feature at all. As with Python's 
> builtin enumerate() function, maybe what we want here is an iterator 
> adapter that dereferences to a std::pair<index_type, 
> original_iterator_value_type>?

This would fit in well with the proposed resolution of 
https://svn.boost.org/trac/boost/ticket/3469. I'll reference this 
discussion from that ticket. Thanks for the suggestion.

-- 
Eric Niebler
BoostPro Computing
http://www.boostpro.com