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RE: Pointer question |
Categories
C++
Code
Topic:
RE: Pointer question|
Author: Ole Kristian Brattli |
Time: 01.12.2000 17:39 |
Text:
|
>
> > and what does it mean when you use 2 "*" > > like: > > **ptr ? > > This means a pointer to a pointer to a (whatever object ptr is). It is used some times when dealing with multidimensional arrays, among others. > regards, Gunnstein C-point of view: When passing a pointer to a procedure as a parameter, it is passed as a copy. Pointers solve the problem of not being able to manipulate the actual object this pointer reffers to. Now imagine that you want to change the value of the pointer it self... Jupp, a copy of your pointer arrives, is changed by your procedure, and is never returned. To solve this tricky litle piece of nightmare we announce: **pointers. A pointer to a pointer. the copy of the **pointer that is available in the procedure holds the address of the "object" you want to manipulate: the *pointer. Allowing you to perform what ever changes you want to do to your *pointer That really all the magic there is to it. BR -Ole |
Message threads
| Topic: | Author: | Time: |
|
|---|---|---|---|
| Pointer question | Geir Haugom | 10.11.2000 10:32 | |
| RE: Pointer question | Gunnstein Lye | 10.11.2000 10:32 | |
| RE: Pointer question | Ole Kristian Brattli | 01.12.2000 17:39 |
