std::vector resizing issues when using custom allocators in C++20
I just started working with I'm working on a personal project and I'm working with a question with `std::vector` when using a custom allocator that I implemented for my project... The vector is not resizing as expected, and I'm experiencing memory-related issues that seem to stem from the allocator. In particular, when I try to push back elements, I get a runtime behavior: `terminate called after throwing an instance of 'std::bad_alloc'`. Here's a simplified version of my allocator: ```cpp template <typename T> class CustomAllocator { public: using value_type = T; CustomAllocator() noexcept {} template <typename U> CustomAllocator(const CustomAllocator<U>&) noexcept {} T* allocate(std::size_t n) { if (n > std::size_t(-1) / sizeof(T)) throw std::bad_alloc(); return static_cast<T*>(::operator new(n * sizeof(T))); } void deallocate(T* p, std::size_t) noexcept { ::operator delete(p); } }; ``` And here’s how I am using the vector: ```cpp std::vector<int, CustomAllocator<int>> vec; for (int i = 0; i < 10; ++i) { vec.push_back(i); } ``` This code seems to cause `std::bad_alloc` behavior when the vector tries to resize after the initial capacity is reached. I have verified that my allocator is indeed being used by checking it with `std::allocator_traits`. I've also tried to adjust the allocation logic, but nothing seems to work. The compiler I'm using is GCC 11.2 with C++20 standard enabled. Any insights into what might be causing this scenario or how I can resolve it would be greatly appreciated. I'm particularly concerned if I might be missing something regarding the allocator requirements in C++20 that could be influencing the behavior. My development environment is Windows. I'm working on a application that needs to handle this. Any advice would be much appreciated.