On 10/17/16 9:42 AM, Edwin van Leeuwen wrote:
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.

Hm... this could work:

Val get(Val, T)(auto ref T item, string memberName, Val defaultValue = Val.init)

int x = t.get("a", 1);
int x = t.get!int("a");

-Steve

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