class ClassVarDecNode : public AST{
 public:
  ClassVarDecNode(string staticOrFieldKeyword, string classVarType, AST* listVarNameNode, char semicolon, AST* classVarDecNode);
  ~ClassVarDecNode();
  void visit();

 private:
  string staticOrFieldKeyword;
  string classVarType;
  AST* listVarNameNode;
  char semicolon;
  AST* classVarDecNode;
};

ClassVarDecNode::ClassVarDecNode(string staticOrFieldKeyword, string classVarType, AST* listVarNameNode, char semicolon, AST* classVarDecNode):
  AST(),
  staticOrFieldKeyword( staticOrFieldKeyword ),
  classVarType( classVarType ),
  listVarNameNode( listVarNameNode ),
  semicolon( semicolon ),
  classVarDecNode( classVarDecNode )
{}

$$ = new ClassVarDecNode("somestring", "somestring", someListNode, ';', NULLPOINTER);

terminate called after throwing an instance of 'std::logic_error'
  what():  basic_string::_M_construct null not valid
Aborted