Casting twice in the same line

Question

I saw this code in project.

b\'s type is void*:

void *b = ...;
int a = (int) (unsigned long) b;

Is this line

Answer 1

I see this in my project too.

For my case, the content of 'b' is populated by other sources/middleware used for inter-process communication.

Once 'b' is populated, the program will get the contents of 'b' with a cast to the correct field 'a'. the application then uses 'a' for processing.

My project uses char* instead of void* though.