Obtaining argument names in (variadic) functions

[data pulverizer via Digitalmars-d-learn]

On Wednesday, 16 March 2016 at 20:53:42 UTC, JR wrote:
> On Wednesday, 16 March 2016 at 20:24:38 UTC, data pulverizer 
> wrote:
>> Hi D gurus,
>>
>> is there a way to obtain parameter names within the function 
>> body? I am particularly interested in variadic functions. 
>> Something like:
>>
>> void myfun(T...)(T x){
>>     foreach(i, arg; x)
>>         writeln(i, " : ", arg);
>> }
>>
>> void main(){
>>     myfun(a = 2, b = "two", c = 2.0);
>> }
>>
>> // should print
>> a : 2
>> b : two
>> c : 2.0
>>
>> Thanks in advance
>>
>> Loving the mixins and tuples
>
> You can do it precisely like that if the variables/symbols you 
> pass as (template) arguments are properly declared first.
>
> http://dpaste.dzfl.pl/0b452efeaaab
>
>
> void printVars(Args...)()
> if (Args.length > 0)
> {
>     import std.stdio : writefln;
>
>     foreach (i, arg; Args) {
>         writefln("%s\t%s:\t%s", typeof(Args[i]).stringof, 
> Args[i].stringof, arg);
>     }
> }
>
> void main() {
>     int abc = 3;
>     string def = "58";
>     float ghi = 3.14f;
>     double jkl = 3.14;
>
>     printVars!(abc,def,ghi,jkl)();
> }

That's brilliant! Thanks JR