base64 iterators can't be used with iterator_advance

[Johel Ernesto Guerrero Peña <johelegp@…>]

#include <boost/container/string.hpp>
#include <boost/archive/iterators/binary_from_base64.hpp>

int main()
{
    using String = boost::container::string;
    using Iterator = boost::archive::iterators::binary_from_base64<String::iterator>;

    String s;
    s.assign(Iterator{s.begin()},Iterator{s.end()});
}

This code causes a ​compilation error because all overloads of iterator_advance in boost/intrusive/detail/iterator.hpp are disabled.

I tried changing the 54th line in boost/intrusive/detail/iterator.hpp from

      < ::boost::move_detail::is_same

to

      < ::boost::move_detail::is_convertible

because the transform_iterator synopsis mentions that it should be convertible, and it worked.

However, I'm not sure about the correctness of this solution, nor if the problem really lies in the serialization component and not elsewhere.

[Robert Ramey]

forwarding this to the maintainer of boost::intrusive

Robert Ramey

[Ion Gaztañaga]

Thanks for the report. Commit:

​https://github.com/boostorg/intrusive/commit/db14782f0f7aa72b502b6296f0543ac0457d497e

fixes this problem.