Question

I’ve been looking for a way to do safe vectors and maps of dynamic pointers, when I realized C++11 adds unique_ptrs. I looked into how to use them on Google, but have been unsuccessful in looking for details. What I need to know are the following:

1. What, exactly, is different between pointers and unique_ptrs besides automatic memory collection?
2. How would I go about removing a unique_ptr from a vector or map? Is there any special code I have to use besides erasing the iterator?

Answer 1

1. Nothing. A unique_ptr is just a wrapper around a pointer, which deletes the pointer when the unique_ptr is destroyed. It has no overhead (just like the auto_ptr template it replaces).
2. Nope — it will just work. The difficulty actually comes from inserting the pointer into the vector or map — whereas you must move the unique_ptr into the container.