Re: [boost] [range] range_size<T> deprecation, updated docs etc.

From: Sergey Shandar (sergey_at_[hidden])
Date: 2007-11-10 04:15:29

Thorsten Ottosen wrote:
> David Abrahams skrev:
>   
>> on Fri Nov 09 2007, Thorsten Ottosen <nesotto-AT-cs.aau.dk> wrote:
>>
>>     
>>> Dear all,
>>>
>>> As suggested by several people, I have started to rely on 
>>> range_difference<T>::type in all places of the library.
>>>
>>> I have also updated the docs w.r.t new concepts and are working on 
>>> polishing them.
>>>
>>> 1.35 will introduce a new function
>>>
>>>     template< class T >
>>>     BOOST_DEDUCED_TYPENAME range_difference<T>::type size( const T& r );
>>>       
>> Really, you're returning the difference_type and not the size_type?
>>     
>
> Yes, that was the intension. Iterators don't have a size_type per se, 
> and so it complicated the whole thing a little to make the user worry 
> about this.
>
> -Thorsten
> _______________________________________________
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>   
Would it be better to use a meta-function 'make_unsigned' which converts 
signed type to its correspondent unsigned type? For example:

signed int => unsigned int
::std::ptrdif_t => ::std::size_t
etc.

I've used it for my iterator range: 
http://tools.assembla.com/cbear/browser/trunk/cbear.berlios.de/range.