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 ?

Did you know?Explore Trending and Topic pages for more stories like this.
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,
No comments posted yet

Your Answer:

Login to answer
324 Like 33 Dislike
Previous forums Next forums
Other forums

Operator precedence assistance.
I did a quick Google search and couldn't quite find the answer I wanted in terms I could understand,

help with multi-update
Now sure how to ask this really....
10g database if that matters.

I have a customer

Why is my row count 0?
Here's the MySQL query i'm running. It basically pulls data from 2 tables based on some data passed.

Page doesn't expand for content
Hi. I've been testing a query I made. It's here http://lapr1.6te.net/inquerito.php
The page doesn

need to apply an if/else statement to Tim Thumb script
Not sure how to work this. I essentially want to call a variety of image sizes based on which style

php unable to sent email
Hi, guys, I try to send a email through php but unfortunately the mail unable to sent. Here is my co

Php navigation
I have four buttons on a php page.
If i click a button it will redirect to different php pages.

checkbox update
I am having a brain fart right now and i cant remember how to do this. if anyone could help that wou

Is it possible to put an entire 500-page book in a database with PHP?
I am working on an intranet and I was wondering if its possible to code php with mysql to enter a fu

Problem with array max size.
Hi to everyone,
I've got a homework about filling a bidimensional array un spiral shape, I alre

Sign up to write
Sign up now if you have flare of writing..
Login   |   Register
Follow Us
Indyaspeak @ Facebook Indyaspeak @ Twitter Indyaspeak @ Pinterest RSS



 
© indyaspeak.com. All Rights Reserved.
Play Free Quiz and Win Cash