Databases
StackOverflow2013
Postsdbo
POC++: delete object or delete members?
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POC++: delete object or delete members?
    primarykey
    data
    text
    <p>I would like to ask about the functional difference; maybe ask for an example scenario, where I should choose from one of the options in the main method below:</p> <pre><code>#include &lt;iostream&gt; using namespace std; class A{ private: int x, y; public: A(int, int); }; class B{ private: int *x, *y; public: B(int, int); ~B(); }; A:: A(int x, int y){ this-&gt;x = x; this-&gt;y = y; } B:: B(int x, int y){ this-&gt;x = new int(x); this-&gt;y = new int(y); } B:: ~B(){ delete this-&gt;x; delete this-&gt;y; } int main(){ int x = 0, y = 0; A* objA = new A(x, y); // line 1 B objB1(x, y); // line 2 B* objB2 = new B(x, y); // line 3 delete objA; delete objB2; return 0; } </code></pre> <p>I understand that the second declaration in the main method <code>B objB1(x, y)</code> is obviously different from the other 2, but can someone please explain the functional difference between the constructors in lines labelled 1 and 3? Is there any bad practice in either of the declarations?</p> <p>Thanks</p> <p>NAX</p> <p><strong>UPDATE</strong></p> <p>First of all, I appreciate all of the answers that everyone is giving, I am really getting some good insight. I have edited the code above as a few of the answers pointed out that I haven't deleted the objects that I used, which is fair and all, but that was not the purpose of my question. I just wanted to gain some insight on the functional difference between the different approaches to creating the classes. And thanks to all that targeted that point. I am reading through the answers still.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USnaxchange
    1. USnaxchange
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    3. PO
      singulars
      1. PTAnswer
    1. VO
      singulars
      1. POC++: delete object or delete members?
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. POC++: delete object or delete members?
      1. USAndy.G
      1. VTFavorite
    1. COStick with the `A` class and line 2 declaration.
      singulars
      1. POC++: delete object or delete members?
      1. USchris
    2. CORead [this](http://dl.dropbox.com/u/6101039/Modern%20C%2B%2B.pdf), then look carefully at your code and consider what may be "bad practice".
      singulars
      1. POC++: delete object or delete members?
      1. USWhozCraig
    3. CO@naxchange Are you actually asking about differences between lines labeled 1 and 3, or the classes A and B? Because apart from constructing different types of objects, those two line are identical.
      singulars
      1. POC++: delete object or delete members?
      1. USyzt
 

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