Re: How to search for an enum by values and why enum items aren't unique

[Meta via Digitalmars-d-learn]

On Wednesday, 27 July 2016 at 13:59:54 UTC, stunaep wrote:
So how would I make a function that takes an enum and an id as 
a parameter and returns a member in the enum? I tried for quite 
some time to do this but it wont let me pass Test as a 
parameter unless I use templates. I finally came up with this 
but it wont let me return null when there's nothing found

E findEnumMember(E)(int id) if (is(E == enum)) {
        auto found = [EnumMembers!E].find!(a => a.id == id)();
        if(!found.empty)
                return found.front;
        else
                ...What do I return? null gives error
}

If you're going to do it like this your only real options are to 
return a Nullable!E or throw an exception if the id isn't found.