Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <p>Well... basically you are calling non-existing function. When you use <code>get_key(xPtr)</code> inside a BST you are calling <code>BSD::get_key(Node*)</code>. You are allowed to call <code>Node::get_key(Node*)</code> but since it's not a static function (which you'd call by <code>Node::get_key(xPtr)</code>) you have to use the object:</p> <pre><code>if (key &lt; xPtr-&gt;get_key(xPtr)) </code></pre> <p>If you wanted to use it like:</p> <pre><code>Node::get_key(xPtr) </code></pre> <p>you have to mark <code>Node::get_key(Node*)</code> as <code>static</code>:</p> <pre><code>// Node.h class BST; class Node { string m_key; string m_data; Node *m_left; Node *m_right; public: Node(string key, string data) : m_key(key), m_data(data) {} ~Node(); static string get_key(Node *ptr); static string get_data(Node *ptr); static Node* get_left(Node *ptr); static Node* get_right(Node *ptr); }; </code></pre> <p>but even better would be:</p> <pre><code>// Node.h class BST; class Node { string m_key; string m_data; Node *m_left; Node *m_right; public: Node(string key, string data) : m_key(key), m_data(data) {} ~Node(); string get_key(); string get_data(); Node* get_left(); Node* get_right(); }; </code></pre> <p>and:</p> <pre><code>// BSD.cpp string Node::get_key() { return m_key; } string Node::get_data() { return m_data; } Node* Node::get_left() { return m_left; } Node* Node::get_right() { return m_right; } </code></pre> <p>Then you'd be able to use it like this:</p> <pre><code>void BST::insert(string key, string data) { Node* yPtr = NULL; Node* xPtr = m_root; while (xPtr != NULL) { yPtr = xPtr; if (key &lt; xPtr-&gt;get_key()) { // actual object-oriented programming } } } </code></pre> <p>On a side note: don't use <code>using namespace std</code> in header to declare its usage globally - it's not a good thing to do.</p>
    singulars
    1. This table or related slice is empty.
    1. POHow to retrieve data out of a private string
      singulars
      1. PTQuestion
    1. PTAnswer
    1. USMateusz Kubuszok
    1. USMateusz Kubuszok
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POHow to retrieve data out of a private string
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTAcceptedByOriginator
    1. This table or related slice is empty.
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload