Visit Our UNIX and Linux User Community


Does m_pMyObj = NULL; is the same as delete(m_pMyObj )?


 
Thread Tools Search this Thread
Top Forums Programming Does m_pMyObj = NULL; is the same as delete(m_pMyObj )?
# 1  
Old 12-25-2007
Does m_pMyObj = NULL; is the same as delete(m_pMyObj )?

Hello all
I need at some point to clear the class instance created im doing it from outside the class with this method:

Code:
void MyObj::ClearInstance()
{
  m_pMyObj = NULL;
}

My question is do I cause memory leak here?
Do I need to delete this instance also or instead?
# 2  
Old 12-26-2007
Quote:
Originally Posted by umen
My question is do I cause memory leak here?
Do I need to delete this instance also or instead?
Assuming this is C++, then the answer is maybe. It depends entirely what type the variable is. Some types do have overloaded assignments that do allocate/delete or AddRef/Release as appropriate (eg ATL).

Previous Thread | Next Thread
Test Your Knowledge in Computers #588
Difficulty: Easy
A linear search algorithm is also known as sequential search.
True or False?

10 More Discussions You Might Find Interesting

1. UNIX for Advanced & Expert Users

Rsync with --delete but do not delete peer dirs on target

rsync with --delete won't honor the delete if the source is something/*. I want the delete to work, but not to delete directories on the target that are peer to the intended directory. For example, using these source and target file structures: Source on desktop: ~/ Money/ ... (4 Replies)
Discussion started by: JavaMeister
4 Replies

2. Programming

Mismatched free() / delete / delete [] line no missing

Could you tell me the possibilities of the reason to get the Mismatched free() / delete / delete . I unable to see the line no in the valgrind report. it displays the function name. with that function name, I am not able to find where exactly the issue is there.I am getting the Mismatched free()... (3 Replies)
Discussion started by: SA_Palani
3 Replies

3. Shell Programming and Scripting

Script needed to delete to the list of files in a directory based on last created & delete them

Hi My directory structure is as below. dir1, dir2, dir3 I have the list of files to be deleted in the below path as below. /staging/retain_for_2years/Cleanup/log $ ls -lrt total 0 drwxr-xr-x 2 nobody nobody 256 Mar 01 16:15 01-MAR-2015_SPDBS2 drwxr-xr-x 2 root ... (2 Replies)
Discussion started by: prasadn
2 Replies

4. Shell Programming and Scripting

Redirecting standard out to /dev/null goes to file "/dev/null" instead

I apologize if this question has been answered else where or is too elementary. I ran across a KSH script (long unimportant story) that does this: if ; then CAS_SRC_LOG="/var/log/cas_src.log 2>&1" else CAS_SRC_LOG="/dev/null 2>&1" fithen does this: /usr/bin/echo "heartbeat:... (5 Replies)
Discussion started by: jbmorrisonjr
5 Replies

5. UNIX for Dummies Questions & Answers

/dev/null 2>&1 Versus /dev/null 2>1

How are these two different? They both prevent output and error from being displayed. I don't see the use of the "&" echo "hello" > /dev/null 2>&1 echo "hello" > /dev/null 2>1 (3 Replies)
Discussion started by: glev2005
3 Replies

6. Shell Programming and Scripting

Delete specific line containing null after '='

Hi, I'm genrating a file from sql and the file looks like : $value1=A $value2=B $value3= $value4= $value5=C I want to delete those two lines which has Null after '='. Could you please guide me how to do it either using sed or awk ? (9 Replies)
Discussion started by: santanu83_cse
9 Replies

7. Shell Programming and Scripting

Insert string 'NULL' where there is a null value

I have an input file having 7 fields delimited by , eg : 1,ABC,hg,1,2,34,3 2,hj,YU,2,3,4, 3,JU,kl,4,5,7, 4,JK,KJ,3,56,4,5 The seventh field here in some lines is empty, whereas the other lines there is a value. How do I insert string NULL at this location (7th loc) for these lines where... (8 Replies)
Discussion started by: zilch
8 Replies

8. Shell Programming and Scripting

PHP: how can I delete empty/NULL elements from a multi-dimensional array.

Hi all I have a file that i'm running and exec(cat ./dat) against..and putting its contents into any array, then doing an exploding the array into a multi-dimension array... The 15 multi-dimensional arrays have elements that are null/empty, I would like to remove/unset these elements and then... (2 Replies)
Discussion started by: zeekblack
2 Replies

9. Shell Programming and Scripting

compare null with non-null

I've got a very peculiar situation. I'm trying to find out if we can compare null fields with non-null. I've output csv files from SQL and Oracle. I need to compare each field from the files, and then find out any differences. The files usualy have over 500 fields, and send the resule to DBA.... (8 Replies)
Discussion started by: nitin
8 Replies

10. UNIX for Advanced & Expert Users

Null Value

Hello All, I have a file of the format **** 123 abc ABC 456 bcd BCD 789 def 112 ghi GHI 223 jkl 344 mno MNO **** I am trying to extract the lines that have no values in the third field (in this case, this would be 789 def 223 jkl Can anyone please help??... (1 Reply)
Discussion started by: Khoomfire
1 Replies

Featured Tech Videos