Is there a way to avoid crash when static cast is used

Question

Hi

Refer code below:

https://www.sololearn.com/compiler-playground/cZGbHJVaI9b2

Question is related to static_cast... Refer function called Test4.

Code line
derived* pd = static_cast<derived*>(pb);

is trying to convert base class pointer to derived class pointer where base class pointer pb was holding reference of base object

So this cast is failed as I have used static_cast....

Now If i am trying to uncomment the code line pd->display1();, it obviously crashes.

I know I should be using dynamic_cast, but is there a chance to avoid such crash without using costly dynamic cast?
https://code.sololearn.com/cZGbHJVaI9b2/?ref=app

Answer 1

I can't click the link in your post. It doesn't seem like a code URL as well, so could you re-post the link to the code.

Answer 2

https://code.sololearn.com/cZGbHJVaI9b2

but It doesn't crash for me !?

anyway to same class pointer(up/down cast) you must use dynamic_cast and to see if cast was successful you can check if the pointer isnt nullptr

Answer 3

Prashanth Kumar thanks

I have also updated question text to attach code

Just uncomment line 90 and it will crash....

Answer 4

Ketan Lalcheta

To downcast you must use dynamic_cast
not static_cast

line 85

Answer 5

I am already using dynamic cast in test5 function...

I just wanted to check is there a way to avoid atleast crash if static cast is used ? Or no way at all or any tweak and it is bound to crash