#include <cassert>
#include <memory>

struct Item {
    int value;
    explicit Item(int n) noexcept : value(n) {}
    ~Item() noexcept {}
};

int main() {
    std::allocator<Item> allocator;
    Item* storage = allocator.allocate(1);
    Item* item = std::construct_at(storage, 42);
    assert(item->value == 42);
    std::destroy_at(item);
    allocator.deallocate(storage, 1);
}