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Cannot be used with Boost.Sort because boost::range::sort is used internally #1445

@AlanIWBFT

Description

@AlanIWBFT

The following snippet doesn't compile:
https://godbolt.org/z/1TdazEzjT

#include <boost/geometry.hpp>
#include <boost/sort/sort.hpp>

int main()
{
    return 0;
}

output:

In file included from /app/boost/include/boost/sort/spreadsort/integer_sort.hpp:25,
                 from /app/boost/include/boost/sort/spreadsort/spreadsort.hpp:27,
                 from /app/boost/include/boost/sort/sort.hpp:16,
                 from <source>:2:
/app/boost/include/boost/sort/spreadsort/detail/constants.hpp:12:11: error: 'namespace boost::sort { }' conflicts with a previous declaration
   12 | namespace sort {
      |           ^~~~
In file included from /app/boost/include/boost/detail/algorithm.hpp:47,
                 from /app/boost/include/boost/graph/graph_utility.hpp:27,
                 from /app/boost/include/boost/graph/biconnected_components.hpp:22,
                 from /app/boost/include/boost/geometry/algorithms/detail/overlay/graph/graph_util.hpp:12,
                 from /app/boost/include/boost/geometry/algorithms/detail/overlay/graph/detect_biconnected_components.hpp:19,
                 from /app/boost/include/boost/geometry/algorithms/detail/overlay/traverse.hpp:20,
                 from /app/boost/include/boost/geometry/algorithms/detail/overlay/overlay.hpp:37,
                 from /app/boost/include/boost/geometry/algorithms/detail/overlay/intersection_insert.hpp:34,
                 from /app/boost/include/boost/geometry/algorithms/detail/intersection/interface.hpp:18,
                 from /app/boost/include/boost/geometry/algorithms/detail/intersection/gc.hpp:19,
                 from /app/boost/include/boost/geometry/algorithms/difference.hpp:19,
                 from /app/boost/include/boost/geometry/algorithms/detail/relate/implementation_gc.hpp:18,
                 from /app/boost/include/boost/geometry/algorithms/detail/covered_by/implementation_gc.hpp:16,
                 from /app/boost/include/boost/geometry/algorithms/covered_by.hpp:25,
                 from /app/boost/include/boost/geometry/algorithms/detail/buffer/buffered_piece_collection.hpp:33,
                 from /app/boost/include/boost/geometry/algorithms/detail/buffer/buffer_inserter.hpp:30,
                 from /app/boost/include/boost/geometry/algorithms/detail/buffer/implementation.hpp:25,
                 from /app/boost/include/boost/geometry/algorithms/buffer.hpp:22,
                 from /app/boost/include/boost/geometry/geometry.hpp:63,
                 from /app/boost/include/boost/geometry.hpp:17,
                 from <source>:1:
/app/boost/include/boost/range/algorithm/sort.hpp:30:27: note: previous declaration 'namespace boost::range { }::sort'
   30 | inline RandomAccessRange& sort(RandomAccessRange& rng)
      |                           ^~~~
In file included from /app/boost/include/boost/sort/spreadsort/detail/spreadsort_common.hpp:24,
                 from /app/boost/include/boost/sort/spreadsort/detail/integer_sort.hpp:24,
                 from /app/boost/include/boost/sort/spreadsort/integer_sort.hpp:26:
/app/boost/include/boost/sort/pdqsort/pdqsort.hpp:29:11: error: 'namespace boost::sort { }' conflicts with a previous declaration
   29 | namespace sort {
      |           ^~~~
/app/boost/include/boost/range/algorithm/sort.hpp:30:27: note: previous declaration 'namespace boost::range { }::sort'
   30 | inline RandomAccessRange& sort(RandomAccessRange& rng)
      |                           ^~~~
/app/boost/include/boost/sort/spreadsort/detail/spreadsort_common.hpp:29:11: error: 'namespace boost::sort { }' conflicts with a previous declaration
   29 | namespace sort {
      |           ^~~~
/app/boost/include/boost/range/algorithm/sort.hpp:30:27: note: previous declaration 'namespace boost::range { }::sort'
   30 | inline RandomAccessRange& sort(RandomAccessRange& rng)
      |                           ^~~~
...

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