std::vector causing segmentation fault when resizing in C++20 with custom allocator
This might be a silly question, but This might be a silly question, but I'm working with a segmentation fault when trying to resize a `std::vector` that uses a custom allocator in C++20. The allocator is designed to track memory usage, and it seems to work well when allocating and deallocating individual objects. However, when I attempt to resize the vector, I get a segmentation fault. Here's a simplified version of my allocator: ```cpp template <typename T> class TrackingAllocator { public: using value_type = T; TrackingAllocator() noexcept {} template <class U> TrackingAllocator(const TrackingAllocator<U>&) noexcept {} T* allocate(std::size_t n) { std::cout << "Allocating " << n << " elements" << std::endl; return static_cast<T*>(::operator new(n * sizeof(T))); } void deallocate(T* p, std::size_t n) noexcept { std::cout << "Deallocating " << n << " elements" << std::endl; ::operator delete(p); } }; ``` I then create a vector using this allocator: ```cpp std::vector<int, TrackingAllocator<int>> vec; vec.push_back(1); vec.push_back(2); vec.resize(5); ``` The call to `resize` causes a segmentation fault, and the behavior message indicates an invalid memory access. I've verified that my `allocate` and `deallocate` functions are being called correctly, and I've ensured that the memory is being managed properly. I've also tried adding additional debug output in the `resize` method and noticed that it's trying to allocate more memory than my allocator allows. Could this be related to the way the vector manages its internal state during resizing, or do I need to implement additional methods in my custom allocator? I'm using GCC 10.2 on Ubuntu 20.04. Any insights or suggestions would be greatly appreciated! For context: I'm using C++ on Windows. For reference, this is a production application. I appreciate any insights!