We help IT Professionals succeed at work.

Check out our new AWS podcast with Certified Expert, Phil Phillips! Listen to "How to Execute a Seamless AWS Migration" on EE or on your favorite podcast platform. Listen Now

x

Casting

mdoland
mdoland asked
on
Medium Priority
296 Views
Last Modified: 2010-04-02
Why does this work in C, but not C++? When compiled as a .c-file, it works, but not as a C++-file.

Atype A;
A = func();

It says can't cast (void *) to (void struct *)    ... or something like that.
If you can't solve it now, I can give some more hints.
Mike
Comment
Watch Question

Commented:
The error you described says 'cannot cast (void*) to (void struct *)'
So i think Atype is a typedef to a struct pointer, for example
struct A {
.
};
typedef struct A *Atype;

C allows pointer casts with no limits, at least at the standard warning level. That means
you can cast a float* to a char* without a (char*) before the float.
Under C++, this is treated much more critical as under C ... I think because too many errors
resulted of such typecasts.

P.S: In my personal opinion, it's not good to read if you typedef pointers without
some hints ... for example, 'typedef struct A *Atype' -> no one will see that 'Atype' is a pointer
without seeing the typedef line. But 'typedef struct A *pAType' gives some hint that the
'pAType' type refers to a pointer :)
Commented:
Unlock this solution with a free trial preview.
(No credit card required)
Get Preview

Commented:
And the autograder hits again!
Thank you *so much* for your consideration!
Unlock the solution to this question.
Thanks for using Experts Exchange.

Please provide your email to receive a free trial preview!

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

OR

Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.