tryTo: non-throwing variant of std.conv.to

[Per Nordlöw]

On Wednesday, 15 August 2018 at 09:26:26 UTC, Seb wrote:
>> If so, AFAICT, existing std.conv.to should be implemented on 
>> top of std.conv.tryTo.
>
> Well, for now you can use `ifThrown` from std.exception:
>
> https://dlang.org/phobos/std_exception.html#ifThrown
>
> ---
> "foo".to!int.ifThrown(42)

But the whole idea is to avoid both throwing and catching 
exceptions at all. As this results in orders of magnitudes of 
drop in performance for the throwing case. That's the reason why 
Folly has this aswell.

Thanks anyway, Seb.