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#include "binary_tree.h"
#include <stdlib.h>
Node *initialize(int data) {
Node *item = malloc(sizeof(Node));
item->data = data;
item->left = NULL;
item->right = NULL;
return item;
}
void traverse(Node *node, Visitor visitor, enum Traversal traversal) {
if (!node)
return;
switch (traversal) {
case PREORDER:
visitor(node);
traverse(node->left, visitor, traversal);
traverse(node->right, visitor, traversal);
break;
case INORDER:
traverse(node->left, visitor, traversal);
visitor(node);
traverse(node->right, visitor, traversal);
break;
case POSTORDER:
traverse(node->left, visitor, traversal);
traverse(node->right, visitor, traversal);
visitor(node);
break;
default:
visitor(node);
break;
}
}
static void destructor(Node *node) { free(node); }
void destroy(Node *head) { traverse(head, destructor, POSTORDER); }
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