classA::classA (int iCount ) {
for (int i=1;i<=iCount;i++) {
m_pSuit = new classB(i);
m_pSuit++;
}
Dynamic Array of Pointers
Author
Hi folks,
For the last half an hour, I am staring at my IDE and trying to figure
out how to allocate an array of pointers to an another class from a class
again.
Would somebody give me a pointer ( without use of vectors ) please ?
During this half an hour, All I can come up with is to drop the idea of declaring an array of pointers but sticking to a cursor pointer to mark the position of my data; What I mean is smtg like in a constructor:
Dunno why not the use of vectors but here...
//I think that is right...might need one less * on the Class**Class** array=new Class*[5];
I think you need to be a little clearer on what you want:
Do you want one class to define an array of another?
I would really, really recommend vectors, but ill help you either way ;)
Do you want one class to define an array of another?
I would really, really recommend vectors, but ill help you either way ;)
Author
Thank you guys,
I guess the pointer to a pointer approach will work.
BTW; How can I delete an array on the heap, in this case
a one that is using pointer to a pointer , again with
delete[] as we do for arrays ?
And I can't use vectors because I haven't learned it yet but
I will be there hopefully ; )
Thanks again!
I guess the pointer to a pointer approach will work.
BTW; How can I delete an array on the heap, in this case
a one that is using pointer to a pointer , again with
delete[] as we do for arrays ?
And I can't use vectors because I haven't learned it yet but
I will be there hopefully ; )
Thanks again!
Author
Quote:Original post by ender7771
I think you need to be a little clearer on what you want:
Do you want one class to define an array of another?
What I am trying to do is :
one class to define a dynamic array of another : )
Quote:Original post by _ArmuT_Quote:Original post by ender7771
I think you need to be a little clearer on what you want:
Do you want one class to define an array of another?
What I am trying to do is :
one class to define a dynamic array of another : )
So you want to create an array of pointers to objects?
int n = 5; // first create the array of pointers Class2 ** Array = new Class2 *[ n ]; for ( int i = 0; i < n; i++ ) { // then create an object for each element in the array Array = new Class2();<br> }<br><br> // be sure to delete both the objects and the array itself<br> for ( int j = 0; j < n; j++ ) {<br> delete Array[ j ];<br> }<br> delete [] Array;<br></pre>
Author
Quote:
So you want to create an array of pointers to objects?// be sure to delete both the objects and the array itself for ( int j = 0; j < n; j++ ) { delete Array[ j ]; } delete [] Array;
What you are saying is I have to delete every object stored in my array
manually and also I have to delete the array itself ( double pointer) in
order to prevent memory leak ?
Thanks for your time ..
Quote:Original post by _ArmuT_Quote:
So you want to create an array of pointers to objects?// be sure to delete both the objects and the array itself for ( int j = 0; j < n; j++ ) { delete Array[ j ]; } delete [] Array;
What you are saying is I have to delete every object stored in my array
manually and also I have to delete the array itself ( double pointer) in
order to prevent memory leak ?
Thanks for your time ..
Yep. Also, be sure to use delete[] Array to delect the array (not delete Array), or bad things will happen.
Quote:Original post by _ArmuT_
What you are saying is I have to delete every object stored in my array
manually and also I have to delete the array itself ( double pointer) in
order to prevent memory leak ?
Yes sir, which is why everyone here is strongly suggesting that you use std::vector and spare yourself the trouble. Or at the very least, you should consider using some of the smart pointer classes found in the boost library.
Quote:Original post by small_black_sun
So you want to create an array of pointers to objects?int n = 5; // first create the array of pointers Class2 ** Array = new Class2 *[ n ]; for ( int i = 0; i < n; i++ ) { // then create an object for each element in the array Array = new Class2();<br> }<br><br> // be sure to delete both the objects and the array itself<br> for ( int j = 0; j < n; j++ ) {<br> delete Array[ j ];<br> }<br> delete [] Array;<br></pre><!–QUOTE–></td></tr></table></BLOCKQUOTE><!–/QUOTE–><!–ENDQUOTE–><br><br><b>No.</b><br><br>If any of the constructors or allocation functions in your code throw an exception, you're going to leak a lot of memory. At the very least:<br><br><pre><br>int n = 5;<br>Class2 **Array = new Class2 *[n];<br>int i;<br><br>try <br>{<br> for (i = 0; i < n; ++i)<br> Array<span style="font-weight:bold;"> = new Class2();<br>}<br>catch(…)<br>{<br> while (–i > 0) <br> delete Array<span style="font-weight:bold;">;<br> delete [] Array;<br> throw;<br>}<br><br>while (–i > 0) <br> delete Array<span style="font-weight:bold;">;<br>delete [] Array;<br></pre><br><br>
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