Boost logo

Boost :

Subject: Re: [boost] Constant iterator of Single Pass Range
From: Karsten Ahnert (karsten.ahnert_at_[hidden])
Date: 2014-05-06 15:59:44

> All containers are at least forward ranges, not merely single pass ones.
> Since iterating a forward range does not change it, there is no problem
> for it
> to have a `const` `begin()` and `end()` methods (returning const
> iterators).
> What I had issue with is single pass range. Consider something that behaves
> like `std::istream`. The `std::istream_iterator` can be only constructed
> from
> non-const reference to `std::istream`, because the
> `std::istream_iterator::operator++` (and the constructor itself) call the
> `std::istream::operator>>`, which is non-const.

I have exactly the same problem. The iterator approach to treat the
range as a pair of iterators is not sufficient for me, since it bloats
the last iterator. I would like to store all informations in the range
and just pass pointers to the range to the iterators, like Erik Niebler
explains in his posts single pass ranges.

Boost list run by bdawes at, gregod at, cpdaniel at, john at