C++

Forum

 
Returning memory location?

sparky (54)
Hello,
How do I return a memory location from a member function of a class? Any assistance will be really appreciated.
1
2
3
4
5
6
7
8
9
10
 
char *ClassName::memberFunctionName(const int &info)
{
 NodeType *current;
 
 static char address;

 address = &current;

 return address;
}

Duthomhas (13206)
That is a dangerous thing to do. What are you trying to accomplish?
sparky (54)
I am trying to create a member function of a class that searches a linked list for a particular value, and when it finds that value, it returns the address of the node where the info is stored. Here is an example:

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
 
char *ClassName::memberFunctionName(const int &info)
{
   ClassName *current;
   static char [10] address;
   bool found = false;
   current = head; // head is defined in the header file
  
   while(current->info != NULL && !found)
   {
       if(current->info == info)
       {
           found = true;

       }
        else
               current = current->next;
       
   }

   address = &current; 
    if (found)
            return address;
    else 
            return NULL;
}
Duthomhas (13206)
I think you are a little confused on how pointers work. You might want to take a read through the tutorial section of this site.

Don't use static values. Just return the found current address.
1
2
3
4
5
6
 
while (current != NULL)
  {
  if (current->info == info) break;
  current = current->next;
  }
return current;

Good luck!
sparky (54)
Your right Duoas. So Ive redone it and it now works. Thanks
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
 
ClassName *ClassName::memberFunctionName(const int &info)
{
   ClassName *current;
   //static char [10] address;
   bool found = false;
   current = head; // head is defined in the header file
  
   while(current->info != NULL && !found)
   {
       if(current->info == info)
       {
           found = true;
       }
        else
               current = current->next;       
   }
   //address = &current; 
    
if (found)
            return current;
    else 
            return NULL;
}

Duthomhas (13206)
Glad to have been of help. :-)
Topic archived. No new replies allowed.