有关auto_ptr的一些注意事项

http://www.codeproject.com/KB/tips/CBP_for_memory_allocation.aspx

Use auto_ptr more often than you currently do when allocating so that deallocation is handled automatically. Remember the following guidelines when dealing with auto_ptrs.

• An existing non-const auto_ptr can be reassigned to own a different object by using its reset() function.
• The auto_ptr::reset() function deletes the existing owned object before owning the new one.
• Only one auto_ptr can own an object. So after one auto_ptr (say, P1) has been assigned to another auto_ptr (say, P2) do not use P1 any longer to call a method on the object as P1 is reset to NULL. Remember that the copy of an auto_ptr is not equivalent to the original.
• Do not put auto_ptrs into standard containers. This is because doing this creates a copy of the auto_ptr and as mentioned above, the copy of an auto_ptr is not equivalent to the original.
• Dereferencing an auto_ptr is the only allowed operation on a const auto_ptr.
• auto_ptr cannot be used to manage arrays.