Add support for custom pointers. (#258)

* Add support for custom pointers. * Add comment * lowercase `OpenMP` in `CMakeLists.txt`
2026-08-29 08:34:39 +08:00 · 2024-11-02 17:48:08 -04:00
parent 2d0b499273
commit debe606647
5 changed files with 75 additions and 11 deletions
@@ -0,0 +1,64 @@
+#include <boost/interprocess/managed_mapped_file.hpp>
+#include <scoped_allocator>
+#include <parallel_hashmap/phmap.h>
+#include <vector>
+#include <cstdint>
+#include <iostream>
+
+using mmap_file_t = boost::interprocess::managed_mapped_file;
+
+template <typename T>
+using bi_alloc_t = boost::interprocess::allocator<T, boost::interprocess::managed_mapped_file::segment_manager>;
+
+template <typename T>
+using scoped_alloc_t = std::scoped_allocator_adaptor<T>;
+
+void simple_map() {
+   struct LatpLon {
+      int32_t latp;
+      int32_t lon;
+   };
+
+   using nodestore_pair_t = std::pair<const uint64_t, LatpLon>;
+   using map_t            = phmap::flat_hash_map<const uint64_t, LatpLon, std::hash<uint64_t>, std::equal_to<uint64_t>,
+                                                 bi_alloc_t<nodestore_pair_t>>;
+
+   auto mmap_file =
+      boost::interprocess::managed_mapped_file(boost::interprocess::open_or_create, "map_iv.dat", 1000000);
+   map_t* map = mmap_file.find_or_construct<map_t>("node_store")(mmap_file.get_segment_manager());
+
+   for (unsigned int i = 0; i < 1000; ++i) {
+      LatpLon p = {10, 10};
+      map->emplace(i, p);
+   }
+
+   std::cout << map->at(10).latp << " " << map->at(10).lon << std::endl;
+}
+
+void scoped_map() {
+   using way_t           = std::vector<uint64_t, bi_alloc_t<uint64_t>>;
+   using waystore_pair_t = std::pair<const uint64_t, way_t>;
+   using map_t           = phmap::flat_hash_map<const uint64_t, way_t, std::hash<uint64_t>, std::equal_to<uint64_t>,
+                                                std::scoped_allocator_adaptor<bi_alloc_t<waystore_pair_t>>>;
+
+   auto mmap_file =
+      boost::interprocess::managed_mapped_file(boost::interprocess::open_or_create, "map_iv.dat", 1000000);
+   map_t* map = mmap_file.find_or_construct<map_t>("ways_store")(mmap_file.get_segment_manager());
+
+   for (unsigned int i = 0; i < 1000; ++i) {
+      std::vector<uint64_t> init = {1, 2, 3, 4};
+      map->emplace(std::piecewise_construct, std::forward_as_tuple(i), std::forward_as_tuple(init.begin(), init.end()));
+   }
+
+   std::cout << map->at(10).size() << std::endl;
+   for (auto const& i : map->at(10))
+      std::cout << i << " ";
+   std::cout << std::endl;
+}
+
+int main()
+{
+    simple_map();
+    scoped_map();
+    return 0;
+}