[mlpack-git] [mlpack/mlpack] Serialize a class with "map<int, Node*>" (#811)

[kc420]

I wrote a class like this:
```
class Node
{
public:
  //Node *root;
  map<int, Node*> root;
  template<typename Archive>
  void Serialize(Archive &ar, unsigned int /**/)
  {
    ar & data::CreateNVP(root, "root");
  }
};

class Pad
{
public:
  Node *tree;
  template<typename Archive>
  void Serialize(Archive &ar, unsigned int /**/)
  {
    ar & data::CreateNVP(tree, "tree");
  }
};
```

I found that I can't use a map contains a pointer like this(but it's okay if replaced  by a "Node *")
Did I wrote something wrong or it's impossible to do that?

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