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  1. #include <iostream>
  2.  
  3. class BST{
  4. private:
  5.     class node{
  6.     public:
  7.         char data;
  8.         node *left;
  9.         node *right;
  10.  
  11.         node(char ch) : data(ch), left(nullptr), right(nullptr) {}
  12.     };
  13.     node *root;//pointer to the root
  14.  
  15.     static void visit_inorder(const node*, void(*)(char)) ;
  16.     static void insert(node*&n, char data);
  17.  
  18. public:
  19.     BST() : root(nullptr) {}
  20.  
  21.     void insert(char data);
  22.  
  23.     // call a function for each element.
  24.     void visit_inorder(void(*f)(char)) const { visit_inorder(root, f); }
  25. };
  26.  
  27. void BST::insert(BST::node*& n, char data)
  28. {
  29.     if (data < n->data)
  30.     {
  31.         if (n->left)
  32.             insert(n->left, data);
  33.         else
  34.             n->left = new node(data);
  35.     }
  36.     else if (data > n->data)
  37.     {
  38.         if (n->right)
  39.             insert(n->right, data);
  40.         else
  41.             n->right = new node(data);
  42.     }
  43. }
  44.  
  45. void BST::insert(char data)
  46. {
  47.     if (root == nullptr)
  48.         root = new node(data);
  49.     else
  50.         insert(root, data);
  51. }
  52.  
  53. void BST::visit_inorder(const BST::node* n, void(*func)(char))
  54. {
  55.     if (!n)
  56.         return;
  57.  
  58.     visit_inorder(n->left, func);
  59.     func(n->data);
  60.     visit_inorder(n->right, func);
  61. }
  62.  
  63. void print_element(char element)
  64. {
  65.     std::cout << element << '\n';
  66. }
  67.  
  68. int main()
  69. {
  70.     BST bst;
  71.     bst.insert('P');
  72.     bst.insert('B');
  73.     bst.insert('Z');
  74.     bst.insert('R');
  75.     bst.insert('C');
  76.  
  77.     bst.visit_inorder(print_element);
  78. }
  79.  
Success #stdin #stdout 0s 3428KB
comments (?)
stdin 
Standard input is empty
stdout 
B
C
P
R
Z
https://ideone.com/csUAz4
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
secret

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