Re: [boost] [range] Extended... maybe?

Subject: Re: [boost] [range] Extended... maybe?
From: Thorsten Ottosen (thorsten.ottosen_at_[hidden])
Date: 2009-04-16 15:03:15

Vladimir.Batov_at_[hidden] skrev:
> I am trying something looking fairly reasonable:
> 
>         string str1 = boost::replace_all_copy(str, 'x', '0');
> 
> It obviously fails to compile with: 
> 
>         error: no matching function for call to 'begin(const char&)'
>         error: no matching function for call to 'end(const char&)'
> 
> as replace_all_copy() wants boost::ranges for the 2nd and 3rd parameters:
> 
>         replace_all_copy(
>                 const SequenceT &, 
>                 const Range1T &, 
>                 const Range2T &);
>  
> and 'x' and '0' are not boost::ranges. Would that be sensible to extend 
> boost::range along the following lines to allow string_algo to work with 
> individual characters?
> 
> namespace boost
> {
>     template<>
>     struct range_iterator<char>
>     {
>         typedef char* type;
>     };
>     template<>
>     struct range_const_iterator<char>
>     {
>         typedef char const* type;
>     };
>     namespace range_detail
>     {
>         template<> inline char const* boost_range_begin(char const& c)
>         {
>             return &c;
>         }
>         template<> inline char const* boost_range_end(char const& c)
>         {
>             return &c + 1;
>         }
>     }
> }

I think single_element_range(x) has been proposed
several times. Maybe Neil could include it in range_ex?

-Thorsten