Re: [boost] [iterator] counting_iterator::reference should bevalue_type?

Subject: Re: [boost] [iterator] counting_iterator::reference should bevalue_type?
From: Arno Schödl (aschoedl_at_[hidden])
Date: 2009-01-05 15:59:31

>> currently, counting_iterator<T>::reference is Incrementable const&. This makes
>> reverse_iterator< counting_iterator<T> >::dereference return a reference to a
>> temporary variable:
>>
>> typename super_t::reference dereference() const { return *boost::prior(this->base());
>> }
>>
>> IMO, the solution is to make counting_iterator return by value.
>
>But then it is no longer a C++03 random access iterator.  

The same is true for a random_access_traversal transform_iterator with a functor returning by value. Why is this so bad?

>Could you please open a Trac ticket for this one?

Done.

Arno

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