C++ Map of Vector of Structs?

Answer 1

Either you forgot to #include the right headers or didn't import the std namespace. I suggest the following:

#include <map>
#include <vector>

std::map<unsigned short, std::vector<struct dv_nexthop_cost_pair> > dv;

Answer 2

use typedef

typedef std::map<unsigned short, std::vector<struct dv_nexthop_cost_pair> > dvnexthopemap;
dvnexthopemap db;