Re: [boost] [range/iterator] operator[] forwarding

From: David Abrahams (dave_at_[hidden])
Date: 2006-10-11 17:40:45

Thorsten Ottosen <thorsten.ottosen_at_[hidden]> writes:

> Shunsuke Sogame wrote:
>> Hi gurus, under RC_1_34,
>> 
>>     #include <boost/range.hpp>
>>     #include <boost/iterator/counting_iterator.hpp>
>> 
>>     int main()
>>     {
>>         boost::make_iterator_range(
>>             boost::make_counting_iterator(0),
>>             boost::make_counting_iterator(5)
>>         )[2];
>>     }
>> 
>> 
>> VC++7.1 and GCC3.4 says a warning something like
>> "returning address of local variable or temporary".
>> 
>> counting_iterator is implemented by iterator_facade,
>> whose operator[] returns *value*.
>> In fact, the result type of iterator_facade's operator[] seems unspecified.
>> Is it possible to do forwarding of iterator's operator[], which is
>> tried by iterator_range?
>
> We could add operator() which would return operator[]()'s result by value.
>
> Is anybody opposed to that?

Probably.  What is the point of doing that?
-- 
Dave Abrahams
Boost Consulting
www.boost-consulting.com