I have a map like this:

```
map<prmNode,vector<prmEdge>,prmNodeComparator> nodo2archi;

```

I need to have an identical copy of this map. How is the fast way to make this?
I have tried this: 

```
map<prmNode,vector<prmEdge>,prmNodeComparator> copiamap( nodo2archi );

```

but it doesn't work. The copiamap is empty.
Thank you very much