On Wednesday, 19 July 2017 at 16:13:28 UTC, Swoorup Joshi wrote:
On Wednesday, 19 July 2017 at 15:31:08 UTC, ag0aep6g wrote:
On 07/19/2017 03:30 PM, sontung wrote:
So I was thinking of some sort of syntax like this:

     if(int i = someFunc(); i >= 0)
     {
         // use i
     }
Thoughts on this sort of feature?

I'd prefer a new variant of `with`:

----
with (int i = someFunc()) if (i >= 0)
{
    // use i
}
----

It's slightly more verbose, but the meaning is clearer (arguable). It extends automatically to other control structures like `switch`.

I wouldn't have this new `with (declaration)` have the magic lookup rules of the existing `with (expression)`. It would be a simpler tool that I'd probably use more than the existing `with`.

I really prefer this over if. This just made sense, just at a glance

Me too.
Would also allow

with(char c = foo()) switch(x)
{
   // use c
}

so no need to switch over the new declared variable, but still beeing able to use it there

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