GetBoxType method.

GetBoxType.cs

private Type GetBoxType<T>()
{
  var t = typeof(T);
  string typeName = t.FullName + "Box";
  foreach (var existingType in _moduleBuilder.GetTypes())
  {
    if (existingType.FullName == typeName)
    {
      return existingType;
    }
  }

  return CreateBoxType(t, typeof (Box<T>), typeName);
}