Re: [Boost-users] boost::iterator_adaptor

From: Delfin Rojas (drojas_at_[hidden])
Date: 2006-05-12 15:09:18

> Grisha Spivak wrote:
>
> <snip>
>
>     it[2] = -22;
>     it[3] = it[5];
>     std::cout << arr[2*2] << ' ' << arr[3*2] << ' ' << 
> arr[5*2] << '\n';
> 
> It prints "-22 33 55" instead of "-22 55 55" (which I 
> expected) - so "it[3] = it[5];" assignment didn't modifies array.
> Is it intended behaviour? Or maybe I'm doing something wrong?
> 
> 

If you change it[3] = it[5]; with it[3] = 55; it will work. The problem is
your iterator_facade::operator[] returns a
boost::detail::operator_brackets_proxy which, I'm not sure why, does not
seem to implement operator=(operator_brackets_proxy const &). There may be a
good reason for this but perhaps the author(s) of the library can answer
that.

-delfin