Add include for add_const

[cho-m]

While testing 1.88.0.beta1 in Homebrew (Homebrew/homebrew-core#217231), I saw a build error for ncmpcpp:

  In file included from ./curses/menu.h:25:
  In file included from /opt/homebrew/include/boost/range/detail/any_iterator.hpp:22:
  /opt/homebrew/include/boost/range/detail/any_iterator_interface.hpp:30:26: error: no template named 'add_const'; did you mean 'std::add_const'?
     30 |                 typename add_const<
        |                          ^

From glance, it looks like Boost add_const is wanted for

range/include/boost/range/detail/any_iterator_interface.hpp

Line 30 in a18dbf5

typename add_const<

[computerquip-work]

Ran into this as well, seems to prevent compilation entirely with no way to work around (without hacking in an add_const.hpp include just before). Change LGTM, I have to use similar locally.

[jwakely]

This patch was not merged to the release branch, so boost-1.90.0 still has this bug.

[adentinger]

@jwakely I have the same problem, so I created an issue for it: #163

[doronbehar]

Please boost maintainers, it'd be nice to include this patch in the 1.88 - 1.90 releases.

[jwakely]

Please boost maintainers, it'd be nice to include this patch in the 1.88 - 1.90 releases.

That's impossible, those releases have already been done (and Boost very rarely does a .1 release like 1.90.1).

But it would be nice if it could get fixed for the next release. It's really silly how often things are fixed on the devel branch and not merged to the (completely separate and unrelated) release branch. The boost branch workflow is error prone and encourages this mistake.