C++ - implementing std::unique_ptr and custom deleter not releasing memory properly
I'm deploying to production and I'm having a hard time understanding I've tried everything I can think of but This might be a silly question, but I'm working with a memory management scenario while using `std::unique_ptr` with a custom deleter in my C++ project... I have a class `Resource` that manages a dynamic array of integers, and I'm using a custom deleter to delete that array when the `unique_ptr` goes out of scope. However, I noticed that the memory isn't being released as expected, leading to potential memory leaks. Here's a simplified version of my code: ```cpp #include <iostream> #include <memory> class Resource { public: Resource(size_t size) : size(size), data(new int[size]) {} ~Resource() { std::cout << "Resource destroyed\n"; } size_t size; int* data; }; void customDeleter(Resource* r) { std::cout << "Custom deleter called\n"; delete[] r->data; delete r; } int main() { std::unique_ptr<Resource, decltype(&customDeleter)> res(new Resource(10), customDeleter); // Do something with res return 0; } ``` When I run the program, I see the output from the destructor of `Resource`, but the custom deleter message sometimes doesn't print, and I'm left wondering if the memory is being properly cleaned up. I've also tried to add debug messages in the custom deleter, but they're inconsistent. Additionally, I've ensured that I'm using C++17, and I'm compiling with `-Wall` to catch any warnings. My development environment is set up with GCC 11.2.0. Is there a question with how I'm configuring the `std::unique_ptr`, or is there another aspect of C++ memory management that I might be overlooking? Any insights or best practices for ensuring that the custom deleter works as intended would be greatly appreciated! I'm working on a web app that needs to handle this. Has anyone else encountered this? My development environment is Linux. I'd really appreciate any guidance on this. Thanks in advance! Am I approaching this the right way? Thanks for any help you can provide! Am I missing something obvious? I'm working with Cpp in a Docker container on Linux. Any suggestions would be helpful.