Re: Nothrow std.conv.to with explicit default value

[Per Nordlöw via Digitalmars-d-learn]

On Wednesday, 20 June 2018 at 09:54:29 UTC, Per Nordlöw wrote:
T toDefaulted(T)(scope const(char)[] value,
                 T defaultValue) @safe pure nothrow @nogc
if (is(T == enum))
{
    switch (value)
    {
        static foreach (index, member; __traits(allMembers, T))
        {
        case member:
            return cast(T)(index);
        }

Oops, this doesn't work for enums with "holes". How do I most 
easily fix that?

This is my solution:

T toDefaulted(T)(scope const(char)[] value, T defaultValue) @safe 
pure nothrow @nogc
if (is(T == enum))
{
    switch (value)
    {
        static foreach (member; __traits(allMembers, T))
        {
        case member:
            mixin(`return T.` ~ member ~ `;`);
        }
    default:
        return defaultValue;
    }
}

Is there a way to avoid compile-time-string-concat plus mixin 
here?