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#### Index stored in mapped file using Boost.Interprocess

    #include <iostream>

    #include <boost/interprocess/managed_mapped_file.hpp>

    #include <boost/geometry.hpp>
    #include <boost/geometry/geometries/point.hpp>
    #include <boost/geometry/index/rtree.hpp>

    namespace bi = boost::interprocess;
    namespace bg = boost::geometry;
    namespace bgm = bg::model;
    namespace bgi = bg::index;

    int main()
    {
        typedef bgm::point<float, 2, bg::cs::cartesian> point_t;

        typedef point_t value_t;
        typedef bgi::linear<32, 8> params_t;
        typedef bgi::indexable<value_t> indexable_t;
        typedef bgi::equal_to<value_t> equal_to_t;
        typedef bi::allocator<value_t, bi::managed_mapped_file::segment_manager> allocator_t;
        typedef bgi::rtree<value_t, params_t, indexable_t, equal_to_t, allocator_t> rtree_t;

        {
            bi::managed_mapped_file file(bi::open_or_create, "data.bin", 1024*1024);
            allocator_t alloc(file.get_segment_manager());
            rtree_t * rtree_ptr = file.find_or_construct<rtree_t>("rtree")(params_t(), indexable_t(), equal_to_t(), alloc);

            std::cout << rtree_ptr->size() << std::endl;

            rtree_ptr->insert(point_t(1.0, 1.0));
            rtree_ptr->insert(point_t(2.0, 2.0));

            std::cout << rtree_ptr->size() << std::endl;
        }

        {
            bi::managed_mapped_file file(bi::open_or_create, "data.bin", 1024*1024);
            allocator_t alloc(file.get_segment_manager());
            rtree_t * rtree_ptr = file.find_or_construct<rtree_t>("rtree")(params_t(), indexable_t(), equal_to_t(), alloc);

            std::cout << rtree_ptr->size() << std::endl;

            rtree_ptr->insert(point_t(3.0, 3.0));
            rtree_ptr->insert(point_t(4.0, 4.0));

            std::cout << rtree_ptr->size() << std::endl;
        }

        return 0;
    }

##### Expected results

    0
    2
    2
    4