Converting a POD struct to a class at compile-time ?

[Klb via Digitalmars-d-learn]

Hello, I'd like to know if it's possible, using CTFE, mixin etc 
to convert a POD struct to a class at compile time.

I've reached the step where the string to mix-in is generated but 
I cant mix it:

-------------------------------------------------------------
import std.stdio;
import std.traits, std.typetuple;

static private template genClassFromStruct(S) if (is(S == struct) 
&(__traits(isPOD, S)))
{
    auto values = S.init.tupleof;
    auto types = typeid(typeof(values));
    auto names = __traits(allMembers, S);

    string genClassFromStruct()
    {
        string members;
        foreach(int i,t; RepresentationTypeTuple!S)
        {
            members ~= t.stringof ~ " " ~ names[i] ~ ";\r";
        }

        return
            "class c" ~ S.stringof ~
            "{" ~ ";\r"~
                members ~
            "}";
    }
}

struct foo{ int a; float b;}
//mixin( genClassFromStruct!foo );

void main(string args[])
{
    foo Foo;
    //auto c = new cfoo;

    writeln( genClassFromStruct!foo );
}
-------------------------------------------------------------

The problem appends when un-commenting the mixin:

Error: static variable _names_field_0 cannot be read at compile 
time.