Re: [Boost-users] [iterator_facade] Help with const iterator for binary file

From: Steven Watanabe (watanabesj_at_[hidden])
Date: 2008-01-11 19:59:12

AMDG

nicola wrote:
> Hi,
> I have a class modeling a record-based read-only binary file and I have 
> written a random access iterator based on iterator_facade to iterate 
> over the records. The class looks like this:
>
> class my_binary_file {
>
> <snip>
>  
>       explicit my_binary_file_iterator(my_binary_file* ff, unsigned int n) : ff_ptr_(ff), rec_num_(n) { }
>   

my_binary_file* is *not* const here.

>      
>  <snip>
>  
>    };
>    
> public:
>    typedef my_binary_file_iterator iterator;
>    
>    iterator begin() *const* { return iterator(this, 0); }
>   

this is a pointer to const.  The constructor of iterator requires a 
pointer to non-const.

In Christ,
Steven Watanabe