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03.25.2008 at 02:56PM PDT, ID: 23268801
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When are contstructors and destructors needed in C++
Tags: C++
I am a VB programmer teaching myself C++.  There is a section on classes that I understand except for the part on Constuctors and Destructors.  What advantage is there in using them and why would I not use the default which means less code?

example from book,

Cat::Cat(int inialAge)    //constructor
{
     itsAge=initialAge;
}
Cat::~Cat   //destructor
{
}
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Question Stats
Zone: Programming
Question Asked By: drleewood
Solution Provided By: jaime_olivares
Participating Experts: 1
Solution Grade: B
Views: 0
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03.25.2008 at 04:16PM PDT, ID: 21207380

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03.25.2008 at 05:01PM PDT, ID: 21207630

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03.25.2008 at 05:22PM PDT, ID: 21207734

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03.25.2008 at 04:16PM PDT, ID: 21207380
Well, your example is too tiny to notice the importance of constructors and destructors.
Classes can have lots of complex members: single values, other objects, collections (arrays, lists, etc), graphical resources, database resources, etc.
Some of these members need to be initialized and lately released.

In a constructor you initialize all the members that need to.
In a destructor you finalize and release memory of some members that need to.

 
03.25.2008 at 05:01PM PDT, ID: 21207630
Could you expand a little on when you need to use constructors and destructors.  Is it a matter of minimizing memory use?  Should I get into the habit of using them all the time?  Like I said I am trying to learn C++ from a book.  Thanks.
 
03.25.2008 at 05:22PM PDT, ID: 21207734
well there are lots of issues you have to learn to clearly understand the benefits and requirements of constructors and destructors.
in C and C++ you are responsible for freeing all the memory you use, this is not the case of a high-level language like visual basic.
by example, you can have a class like:

class myClass
{
private:
      otherClass *collection;

public:
      // public constructor
      myClass()
      {
              collection = new otherClass[10];   // dinamically create an array
      }
     // required destructor
     ~myClass()
     {
            // this is required to avoid a memory leak, because you dinamically created the array
            delete collection;
     }
     // other method here
}
Accepted Solution
 
 
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