void* and sizeof()

Posted on 16th Feb 2014 07:03 pm by admin

Hi,

Using void* and sizeof is it possible to get the value of the object ?

I understand that dereferencing a void pointer is not directly possible. Is there a way (like casting) or something else to get the value of the object.

The problem is I wouldn't know the type of the object to cast to, I would only know the size of the object and a void pointer to the object.

something similar to what qsort does in stdlib.h, using merely the void pointer and sizeof, I think it manages to access the object, otherwise wouldn't be able to sort it.

Below shown is an example in which inside the function f1, I am suppose to access the object.

Code: class ClassA{};//Inside f1, I have to access the value of the object that pPtr1 points tovoid f1(void* pPtr1, const int pSizeOfObj){}int main(){ ClassA objA; f1(&objA, sizeof(objA)); return(0);}Thanks,

Your Answer:

Login to answer

Other forums

Display the user's weight lost in the past week
Hello everyone,

I am working on a weight loss app for my site, and I want to display the user

Help with writing "$" with fopen
I just can't get my syntax correct. Could someone help me please? I am trying to write a connect fil

Is there something wrong?
Hi all,

Just a quick question... can someone look at this code and see if something is wrong?

[Need Help] php timing issues
I don't know what is going wrong. I need some help with being able to set an image at 9:00am Colorad

A problem with my GD class
Hello,

I created a nice (and simple for now) GD class.
The problem is , it works great on

PHP Code To Change Font Color in Table Cell
I would appreciate help with the following snippet of my php code. I am just trying to change the f

calendar dates and hours compare problem
i have a calendar in wordpress, everything works great except that i can make 2 meetings at the same

my sql select id and then update problem.
I need to select some auto incremented ids out of a database and then use those id in a where statem

Post, not working, please help
The error is:
Method Not Allowed
The requested method POST is not allowed for the URL /student

ldap connection
We are using ldap to get user information from the domain controller. It was working before. Recentl