Tuple enhancement

[Edwin van Leeuwen via Digitalmars-d]

On Monday, 17 October 2016 at 13:35:12 UTC, Steven Schveighoffer 
wrote:
>
> Why not something like this:
>
> Val get(T, Val)(auto ref T item, string memberName, Val 
> defaultValue)
> {
>    switch(memberName)
>    {
>    foreach(n; __traits(allMembers, T))
>    {
>       static if(is(typeof(__traits(getMember, item, n)) : Val))
>         case n: mixin("return item." ~ n ~ ";");
>    }
>    default:
>      return defaultValue;
>    }
> }

I like the general solution, although I probably would just 
expect it to fail compiling if no member is present or return 
Val.init if no defaultValue is passed.