Question

I am trying to define a class

class BTree
{
private:
     map<std::string,BTree*> *node;
public:

    BTree(void);
    ~BTree(void);
    void Insert(BTree *);
};

on compiling the code the compiler gives me an error

error C2899: typename cannot be used outside a template declaration  
error C2143: syntax error : missing ';' before '<'  
error C4430: missing type specifier - int assumed. Note: C++ does not support default-int  
error C2238: unexpected token(s) preceding ';'  
error C2899: typename cannot be used outside a template declaration  

I have tried to change the map to something simple like map<int,int> node it still gives me the same error. Am I missing something ?

Answer 1

This is likely because you don’t have the std namespace listed in a using. The type map isn’t in the global namespace so so map isn’t resolvable. Try the following

class BTree {
private:
  std::map<std::string, BTree*> *node;

  ...
};