[Boost-users] Re: iterator_adaptor problem (mpl?)

From: David Abrahams (dave_at_[hidden])
Date: 2004-07-01 13:38:15

Angus Leeming <angus.leeming_at_[hidden]> writes:

> David Abrahams wrote:
>> Why struggle?
>> 
>> boost::transform_iterator should give you just what you need:
>
> Many thanks, David. 
>
> That's altogether much nicer. However, result_of is not part of boost 1.31.
> Attached is an implementation of my code that works fine with 1.31.
> Unfortunately, I can't create a 'const_first_iterator' from a
> 'first_iterator'. Ie, I need:
>
> store my_store;
> store const & my_const_store = my_store; // UGLY!
> store::const_first_iterator const begin = my_const_store.begin_first();
> store::const_first_iterator const end = my_const_store.end_first();
>
> Any further clues, or is this as far as I can go this way?

See the converting constructor described at
http://tinyurl.com/229ld#transform-iterator-synopsis.  As long as the
underlying iterators and unaryfunctions are convertible, the
initialization should work just fine.

> Angus
>
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-- 
Dave Abrahams
Boost Consulting
http://www.boost-consulting.com