Is it possible to filter variadics?

[TheFlyingFiddle via Digitalmars-d-learn]

On Tuesday, 3 November 2015 at 23:41:10 UTC, maik klein wrote:
> Is it possible to filter variadics for example if I would call
>
> void printSumIntFloats(Ts...)(Ts ts){...}
>
> printSumIntFloats(1,1.0f,2,2.0f);
>
> I want to print the sum of all integers and the sum of all 
> floats.
>
>
> //Pseudo code
> void printSumIntFloats(Ts...)(Ts ts){
>     auto sumOfInts = ts
>                       .filter!(isInteger)
>                       .reduce(a => a + b);
>     writeln(sumOfInts);
>     ...
> }
>
> Is something like this possible?

It is possible: I don't think that reduce works on tuples but you 
could do something like this.

import std.traits, std.meta;
void printsumIntFloats(Ts...)(Ts ts)
{
    alias integers = Filter!(isInteger, Ts);
    alias floats   = Filter!(isFloatingPoint, Ts);
    alias int_t    = CommonType!(integers);
    alias float_t  = CommonType!(floats);

    int_t intres = 0;
    float_t floatres = 0;
    foreach(i, arg; ts)
    {
       static if(isInteger!(Ts[i]))
           intres += arg;
       else
           floatres += arg;
    }
    writeln(intres);
    writeln(floatres);
}