Chapter 9

1. This means that two instances of the same allocator are always equal, which in turn means that both allocators can allocate and deallocate each other's memory.
2. If two instances of the same allocator can allocate and deallocate each other's memory.
3. Yes.
4. Yes.
5. When a container is copied, its allocator is also copied.
6. It provides the container with the ability to create a copy of the allocator it was provided for a different type.
7. For std::list, n ==1; for std::vector, n can be any number.