Copy content of one STL container to another

Question

How could I create a copy of an unordered_map from an existing one? Could I use assignment operator or I need to iterate it one by one? Also, I am using shared_ptr as the value in the map. Did I need to take extra care because it is shared_ptr?

typedef unordered_map<string, shared_ptr<classA>>MAP1;
MAP1 map1;
map1["abc"] = make_shared<classA>();
MAP2 map2 = map1; ?? //can I use assignment operator??

Thanks.

Answer 1

Yes you can.

Regarding shared_ptr, if you want the copied pointers to point to the same values then no. If you want two separate copy (deep copy), then you need to do the copying yourself.