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Learning Qlik Sense: The Official Guide

You're reading from   Learning Qlik Sense: The Official Guide Get to grips with the vision of Qlik Sense for next generation business intelligence and data discovery

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Product type Paperback
Published in Feb 2015
Publisher
ISBN-13 9781782173359
Length 230 pages
Edition 1st Edition
Languages
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Toc

Table of Contents (14) Chapters Close

Preface 1. Coding with C++ FREE CHAPTER 2. Variables and Memory 3. If, Else, and Switch 4. Looping 5. Functions and Macros 6. Objects, Classes, and Inheritance 7. Dynamic Memory Allocation 8. Actors and Pawns 9. Templates and Commonly Used Containers 10. Inventory System and Pickup Items 11. Monsters 12. Spell Book Index

Constructors and destructors

The constructor in your C++ code is a simple little function that runs once when the C++ object is first created. The destructor runs once when the C++ object is destroyed. Say we have the following program:

#include <iostream>
#include <string>
using namespace std;
class Player
{
private:
  string name;  // inaccessible outside this class!
public:
  string getName(){ return name; }
// The constructor!
  Player()
  {
    cout << "Player object constructed" << endl;
    name = "Diplo";
  }
  // ~Destructor (~ is not a typo!)
  ~Player()
  {
    cout << "Player object destroyed" << endl;
  }
};

int main()
  {
    Player player;
    cout << "Player named '" << player.getName() << "'" << endl;
  }
  // player object destroyed here

So here we have created a Player object. The output of this code will be as follows:

Player object constructed
Player...
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