Re: [Boost-users] Re: HowTo Iterator Facade

From: Peter Dimov (pdimov_at_[hidden])
Date: 2004-12-04 18:08:10

David Abrahams wrote:
> Duane Murphy wrote:
>> I am implementing an iterator via iterator facade. The container
>> that the iterator is being used with can only return dereferenced
>> values by value (not by reference).
>> 
>> If I implement the dereference() function (for facade) by returning a
>> value (instead of reference) then it appears that the iterator works
>> properly. 
>> 
>> The most important operation that does _not_ work is that the
>> iterator 
>> cannot be used with bind(). (bind cannot be used with non-const
>> return types.) 
> 
> Sorry, I can't imagine what you mean.  Of course bind works with
> non-const return types: [...]

Probably the following:

    std::for_each( first, last, boost::bind( f, _1 ) );

When *first returns a non-const rvalue, bind can't take it.