Re: [Boost-users] [Range] invalid initialization of non-const type with adaptors

Subject: Re: [Boost-users] [Range] invalid initialization of non-const type with adaptors
From: Denis Taniguchi (taniguchi_at_[hidden])
Date: 2010-05-10 10:45:41

On Mon, 2010-05-10 at 15:35 +0100, Neil Groves wrote:
> On Mon, May 10, 2010 at 2:24 PM, Mathias Gaunard
> <mathias.gaunard_at_[hidden]> wrote:
>         Neil Groves wrote:
>         
>                 This can't easily be remedied since the Range Concept
>                 is non-copyable, and we obviously can't pass a const
>                 reference as the target to the fill algorithm. Making
>                 the Range Concept cheaply copyable would mean that the
>                 standard containers were no longer a model of the
>                 Range Concepts. I am currently investigating extending
>                 the sub_range
>         
>         
>         It should be perfectly ok to make iterator_range and sub_range
>         cheaply copyable, since they just wrap iterators.
>         No need to extend the range concepts for that; iterator_range
>         would simply provide more than those concepts.
>         
>         
>         
> 
> 
> The rationale for providing new concepts that extend the sub_range is
> that we can then implement new containers and new algorithms in terms
> of concepts similar to those that Alexandrescu describes. 
> 
> 
> As you have suggested this is actually a very simple extension to
> sub-range and allows efficient interoperability between iterator
> ranges and Alexandrescu style ranges. I'm finding this to be very nice
> when implementing ranges that do not map well to iterators, such as an
> unbounded integer range.
> 
> 
> I'm in the very early stages of exploring these ideas.
> 

Looking forward to see it in next revisions of boost.
Thank you all for the replies, and I'll try to post more meaningful
examples next time.

Regards 

> 
> Regards,
> Neil Groves
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