Call-ie return on behalf of caller?

[Artur Skawina via Digitalmars-d-learn]

On 06/04/15 00:37, Tofu Ninja via Digitalmars-d-learn wrote:
> Is there a way other than exceptions for a called function to force the caller to return?
> 
> Specifically, I know the return type of the caller(its always bool) and under certain circumstances I would like the caller to just give up and return false if the called function fails. With as little boiler plate as possible on the call site. In c++ I could do it very easily with macros, but I am failing to see a similar way to do it in D other than maybe string mixins but that seems like a bit much to do every time I want to call this thing.
> 
> I would be willing to put some boilerplate code in the beginning of the caller, I could just put that in a mixin.
> 
> I know exceptions are really what I should be using but they are such a pain to work with. I don't want to have to put try catch blocks every time I call the caller.
> 
> Any ideas?

Without a preprocessing step, you probably won't find anything
that's much better than:

   enum caught(string C, string R = "typeof(return).init") =
      `try {`~C~`} catch return (`~R~`);`;

   bool f(int a) nothrow {
      mixin (caught!q{ code_that_throws(a); });
      return 1;
   }

artur