You still leak instances, because you do a redundant `construct<>` call before emplacing. Always simplify: [Live On Coliru](https://coliru.stacked-crooked.com/a/4d1a689fc03f3910) ```c++ #include <boost/interprocess/allocators/allocator.hpp> #include <boost/interprocess/managed_mapped_file.hpp> // FOR COLIRU #include <boost/interprocess/managed_shared_memory.hpp> #include <boost/unordered_map.hpp> #include <iostream> namespace bip = boost::interprocess; // Define your types using Id = int; struct Timer { int id; }; // Define allocators for shared memory // using Segment = bip::managed_shared_memory; using Segment = bip::managed_mapped_file; // FOR COLIRU template <typename T> using Allocator = bip::allocator<T, Segment::segment_manager>; template <typename K, typename V, typename H = std::hash<K>, typename Eq = std::equal_to<K>> using Map = boost::unordered_map<K, V, H, Eq, Allocator<std::pair<K const, V>>>; using Timers = Map<Id, Timer>; int main() { // Create managed shared memory Segment segment(bip::open_or_create, "MySharedMemory", 65536); // Construct the unordered map in shared memory Timers* timers = segment.find_or_construct<Timers>("TimerInstanceMap") // (10, segment.get_segment_manager()); timers->emplace(100, Timer{100}); timers->emplace(200, Timer{200}); // Accessing the instance for (Id id : {100, 150, 200}) if (auto it = timers->find(id); it != timers->end()) std::cout << "Found timer instance with id: " << it->second.id << std::endl; else std::cout << "Timer instance not found." << std::endl; for (auto const& pair : *timers) std::cout << "Timer Id: " << pair.first << ", Timer Instance Id: " << pair.second.id << std::endl; // Cleanup: You may want to remove the shared memory segment std::remove("MySharedMemory"); // FOR COLIRU // Segment::remove("MySharedMemory"); } ``` On Sat, Sep 28, 2024, at 11:47 AM, Murali Kishore via Boost wrote:
Thanks, it worked.
On Sat, Sep 28, 2024 at 2:36 PM Joaquin M López Muñoz via Boost < boost@lists.boost.org> wrote:
El 28/09/2024 a las 9:49, Murali Kishore via Boost escribió:
[...]
// Define the unordered_map type typedef boost::unordered_map<timer_id_t, timer_instance_t, std::hash<timer_id_t>, std::less<timer_id_t>, MapAllocator> timer_instance_map_t;
You have to use std::equal_to<timer_id_t> rather than std::less<timer_id_t>. Please try and let us know if that solves your issue.
Joaquin M Lopez Munoz
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-- Regards, Murali Kishore
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