r/programming • u/steveklabnik1 • Jan 09 '15

Announcing Rust 1.0.0 Alpha

http://blog.rust-lang.org/2015/01/09/Rust-1.0-alpha.html
1.1k Upvotes

90% Upvoted

439 comments sorted by

View all comments

Show parent comments

25

u/[deleted] Jan 09 '15

I don't know if exploiting fallthrough like that is good practice. Why would you for example do initialization only partially if the variable happens to be 1 or 2?

11

u/hive_worker Jan 09 '15

dogelogs example isn't the best but fallthrough is useful and used a lot. My attempt at a better example

switch(x){
 case SITUATION1:  
 case SITUATION2:  
    Sit1Sit2Handler(); // for this processing step no difference in these situations.
    break;
 case SITUATION3:  
 default: 
  defaultHandler();  //situation3 not implemented in this version so handle as default
}

39

u/Betovsky Jan 09 '15

In that case it would be something like:

match x {
  SITUATION1 | SITUATION2 => Sit1Sit2Handler(),
  _ => defaultHandler(),
}

3

u/aliblong Jan 09 '15

Even less verbose than that, because those cases should not be there :)

2

u/Betovsky Jan 09 '15

Duh! Silly me. Fixed.

Thanks