Q: Exception design questions

[Daniel Keep]

Henning Hasemann wrote:
> why exactly do you use this pattern? Why not
> 
> auto ex = new SqlProgrammingException("text");
> with(ex) {
>   setSql(operation);
>   setProperty("ValueRow", i);
>   setProperty("ValueType", t);
> }
> throw ex;
> 
> Ok that are 2 additional lines and a temporary variable but that
> shouldnt be a problem, or?
> 
> Henning

I suspect he uses it *because* it's shorter and avoids the temporary
variable. :P  If I didn't hate member call chaining so much, I'd
probably be tempted to do the same; using with makes the code a bit
unwieldy.

Not terribly constructive, but wouldn't it be nice if D had
statements-as-expressions?  Then it would simplify to:

throw with(new SqlProgrammingException("text")) {
  setSql(operation);
  setProperty("ValueRow", i);
  setProperty("ValueType", t);
}

One line longer for the closing brace, but removes the need for both the
temporary and the chained function call.

It's not going to happen, but we can dream, right? :P

	-- Daniel