src/02/01/binary_tree.h


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struct node {
  int data;
  struct node *left;
  struct node *right;
};

typedef struct node Node;
typedef void(Visitor)(Node* node);
enum Traversal { INORDER = 1, PREORDER = 2, POSTORDER = 4 };

Node *initialize(int data);
void traverse(Node *node, Visitor visitor, enum Traversal traversal);
void destroy(Node *head);