Obtaining argument names in (variadic) functions

[JR via Digitalmars-d-learn]

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)();
}