Re: [boost] [HP Tru64][xpressive] help needed

From: Eric Niebler (eric_at_[hidden])
Date: 2007-10-08 10:55:11

Markus Schöpflin wrote:
> The Tru64/CXX std library implements copy as:
> 
>    while (first != last) *result++ = *first++;
> 
> XPressive uses copy in format_backref_ like this:
> 
>          else if(BOOST_XPR_CHAR_(char_type, '&') == *cur) // whole match
>          {
>              ++cur;
>              out = std::copy(
>                this->sub_matches_[ 0 ].first,
>                this->sub_matches_[ 0 ].second,
>                out);
>          }
> 
> This results in calls of the post increment operator of 
> case_converting_iterator, which returns a copy of the iterator object. The 
> assignment operator then modifies this copy and not the original iterator, 
> nullifying the changes done to the iterator object in the assignment operator.
> 
> The test executes OK when I replace the implementation of copy with the 
> following code:
> 
>    while (first != last)
>    {
>      *result = *first;
>      ++first;
>      ++result;
>    }

Ah, ha! A million thanks Markus! I'll find a work around. And credit you 
for your help, of course.

-- 
Eric Niebler
Boost Consulting
www.boost-consulting.com