Question

Can`t I perform typedef inside the class?

#include <vector>
using namespace std;
    class List {
    public:
           typedef int Data;
           class iterator;
           pair<iterator,bool> insert(const Data nodeId); //<-error
    private:
    class Node {
        typedef vector<NodeId> DepList;//<-error
    };
    }

I get an error missing type specifier - int assumed. Note: C++ does not support default-int

Answer 1

You can.

I guess the error is on the line with the pair. Have you included the right header:

#include <utility>

Also, if you don’t have using namespace std; or usgin std::pair;, you need to write std::pair, instead of just pair.

P.S. Please, don’t use using namespace std;, especially header files.

EDIT Looking at your edit, you need #include <vector>, too.
EDIT2: You haven’t defined NodeId, but you have used it for the typedef