Warning

This post was published 89 days ago. The information described in this article may have changed.

Info

This post is auto-generated from RSS feed The Rust Programming Language Forum - Latest topics. Source: Boilerplate reduction - labels for if-expressions

It would be nice if we could label any scope, and then break from them. Similar to (Break with label), but with a better example: I had a complicated set of nested if branching and wanted to break out of them

'my_label : if my_bool
{  // ... do stuff to see if we need to do something else instead
  if stop_this_stuff
  { break 'my_label;
  }
}

it should be equivalent to :

'my_label : loop
{  if my_bool
  {  // ... do stuff to see if we need to do something else instead
    if stop_this_stuff
    { break 'my_label;
    }
  }
  break 'my_loop;
}

(which is the current workaround, I also wrote a macro to generate this, but it looks too ugly)

I guess I could just turn my if-conditions into while-loops that break at the end of the loop. But implementing labels for 'if' statements should be incredibly straightforward for compiler developers, given the equivalence with other syntax.

4 posts - 3 participants

Read full topic

🏷️ Rust_feed