Instead of returning a raw pointer, `LinearAllocator.construct(...)` now returns a `destruct_ptr`, which is similar to `unique_ptr`, but does not deallocate the memory and only calls the destructor instead.
Instead of returning a raw pointer, `LinearAllocator.construct(...)` now returns a `destruct_ptr`, which is similar to `unique_ptr`, but does not deallocate the memory and only calls the destructor instead.