Inconsistent Behavior with Custom Deleters in std::unique_ptr for Array Types
I'm migrating some code and I am encountering an issue while using `std::unique_ptr` with a custom deleter for dynamically allocated arrays in C++. The intention is to manage an array of objects of a class type, but I'm facing inconsistent behavior upon deletion. Here is a simplified version of my code: ```cpp #include <iostream> #include <memory> class MyClass { public: MyClass() { std::cout << "MyClass constructed" << std::endl; } ~MyClass() { std::cout << "MyClass destructed" << std::endl; } }; void customDeleter(MyClass* ptr) { std::cout << "Custom deleter called" << std::endl; delete[] ptr; } int main() { std::unique_ptr<MyClass[], decltype(&customDeleter)> ptr(new MyClass[5], customDeleter); return 0; } ``` In this code, I expected the custom deleter to be called when the `std::unique_ptr` goes out of scope, and the destructors for `MyClass` instances should be invoked as well. However, I only see the output from the custom deleter being called, but not from the destructors of `MyClass` instances. Instead, I get a memory leak warning from my static analysis tool. I have tried replacing `delete[] ptr;` with `for (size_t i = 0; i < 5; ++i) delete ptr[i];` in the `customDeleter`, which does call the destructors, but it seems redundant and not very elegant. I also considered using `std::unique_ptr<MyClass>` for each element instead of an array, but that complicates the management. Is there a recommended way to handle custom deleters for arrays with `std::unique_ptr`? Am I using the array version of `std::unique_ptr` incorrectly, or is there a better design pattern for this situation? I am compiling with GCC 11.2 and using C++17 standards. My development environment is macOS. For reference, this is a production microservice. Thanks for taking the time to read this!