std::unique_ptr not releasing resources after handling in custom deleter
Does anyone know how to I've been banging my head against this for hours. I'm working with an scenario with `std::unique_ptr` that uses a custom deleter. The question arises when an exception is thrown during construction of the object being managed by the `unique_ptr`. I expected the custom deleter to be called and resource to be released, but it seems that the pointer remains allocated, resulting in a memory leak. Here’s a simplified version of my code: ```cpp #include <iostream> #include <memory> #include <stdexcept> struct CustomDeleter { void operator()(int* ptr) const { std::cout << "Deleting resource: " << *ptr << '\n'; delete ptr; } }; int main() { try { std::unique_ptr<int, CustomDeleter> ptr(new int(42)); // Simulate an behavior during some operation throw std::runtime_error("Something went wrong"); } catch (const std::exception& e) { std::cout << "Caught exception: " << e.what() << '\n'; } // ptr goes out of scope here, but was not deleted } ``` When I run this code, I see the exception message, but the `Deleting resource` line never prints, indicating that the `CustomDeleter` is not invoked. I made sure that my `unique_ptr` is in the correct scope, and I expected it to be destroyed when the exception is thrown. Did I miss something about how `std::unique_ptr` handles exceptions, or is there a best practice to ensure the resources are cleaned up properly in such situations? I've also tried checking if the custom deleter throws its own exceptions, but that doesn’t seem to be the case. Any insights would be appreciated. I've been using C++ for about a year now.