import std;

struct Foo
{
   int a;
   string b;
}

struct Point
{
   float x, y, z;
}

struct NF(T)
{
   static foreach (i, f; T.tupleof)
       mixin(q{Nullable!(typeof(f)) } ~ __traits(identifier, T.tupleof[i]) ~ ";");
}

void printNF(X)(auto ref const X val) if (is(X : NF!Y, Y))
{
   static if (is(X : NF!Y, Y))
       writefln!"original type: %s"(Y.stringof);
       
   foreach (i, f; val.tupleof)
       writefln!"%s: %s"(__traits(identifier, val.tupleof[i]), f.isNull ? "null" : f.get.to!string);
}

void main()
{
   auto nfPoint = NF!Point();
   nfPoint.y = 3.14;

   auto nfFoo = NF!Foo();
   nfFoo.a = 42;

   printNF(nfPoint);
   printNF(nfFoo);
}