/dpt/ - Daily Programming Thread

test.c: In function ‘function’:
test.c:3:15: error: parameter ‘message’ has incomplete type
struct mgs message;
^~~~~~~

Well...

(gcc (Ubuntu 7.3.0-27ubuntu1~18.04) 7.3.0)

Ok thanks
I'm on gcc version Ubuntu 8.2.0-7ubuntu1 and it compiled without errors, just warnings

Shit, is that what they meant when they said they'd be removing support for "K&R style function definitions" or something in C20? Wasn't aware you could do that.

// heap allocates memory for thing which will need to be manually freed later
Thing * load_thing_from_file();

vs
// caller is free to control the allocation of their thing however they like
void load_thing_from_file(Thing *output);

I guess the second version is the standard C approach and I can see the advantages, but when would one prefer to use the first version instead? I do see it sometimes.

deleted and reposted for readability

Trying to get multiprocessing to work using Python, the first process should run all the time while rest of the code gets executed by the second process. It looks like this
def main():
process_one = Process(target=first_function())
process_one.start()
process_two = Process(target=second_function())
process_two.start()
return

main()

What happens is that the program stays in the continuous loop that's supposed to be handed off to a new process called process_one instead of continuing to start the second process. How can I fix this? Please tell in simple terms, I've touched programming for the first time yesterday.

At least sin(), cos() tan() and sqrt()

Haskell

IEC 61131-3

What for?

The first approach makes sense for an OOP approach with a constructor which allocates and initializes the object paired with a destructor which cleans up and frees all the bits and pieces dangling inside.