D/C++ Interfacing

D Code:
  extern (C++, b2d) {
    extern (C++, class) struct Array(T){};

    extern (C++, class) struct ImageCodec {
      final Array!ImageCodec builtinCodecs();
    };

    class Image {
      final int width();
      final int height();
    }

    extern (C++, ImageUtils) {
      final int readImageFromFile(Image dst, Array!ImageCodec codecs, const char* filename);
    }
}

C++ Code:
D Code:
  extern (C++, b2d) {
    extern (C++, class) struct Array(T){};

    extern (C++, class) struct ImageCodec {
      final Array!ImageCodec builtinCodecs();
    };

    class Image {
      final int width();
      final int height();
    }

    extern (C++, ImageUtils) {
      final static int readImageFromFile(Image dst, Array!ImageCodec codecs, const char* filename);
    }
}

C++ Code:
template<typename T> class Array {};
typedef Array<ImageCodec> ImageCodecArray;
class Image {};
class ImageCodec {};

ImageCodecArray ImageCodec::builtinCodecs() noexcept { }

int ImageUtils::readImageFromFile(Image& dst, const ImageCodecArray& codecs, const char* fileName) noexcept { }