how to get the \uxxxx unicode code from a char

[jicman via Digitalmars-d-learn]

On Tuesday, 14 October 2014 at 20:13:17 UTC, Brad Anderson wrote:
> On Tuesday, 14 October 2014 at 20:08:03 UTC, Brad Anderson 
> wrote:
>> On Tuesday, 14 October 2014 at 20:05:07 UTC, Brad Anderson 
>> wrote:
>>> https://github.com/D-Programming-Language/phobos/blob/master/std/json.d#L579
>>
>> Oops. Linked the the parser section. I actually don't see any 
>> unicode escape encoder in here. Perhaps he meant the upcoming 
>> JSON module.
>
> Here we go.
>
> https://github.com/s-ludwig/std_data_json/blob/4ecb90626055269f4897902404741f1173fb5e8e/source/stdx/data/json/generator.d#L451
>
> Sönke's is pretty sophisticated. You could probably just use 
> the non-surrogate supporting simple branch.

thanks.  the problem is that I am still in D1. ;-)  over 300K 
lines of code and growing...