@Override
 protected MatrixByteBuffered2x2DType newMatrixFrom(final MatrixReadable2x2DType m) {
   final ByteBuffer buf = ByteBuffer.allocate(200);
   final MatrixByteBuffered2x2DType mr = MatrixByteBufferedM2x2D.newMatrixFromByteBuffer(buf, 0L);
   MatrixM2x2D.copy(m, mr);
   return mr;
 }
 @Override
 protected MatrixByteBuffered2x2DType newMatrix() {
   final ByteBuffer buf = ByteBuffer.allocate(200);
   final MatrixByteBuffered2x2DType mr = MatrixByteBufferedM2x2D.newMatrixFromByteBuffer(buf, 0L);
   MatrixM2x2D.setIdentity(mr);
   return mr;
 }
 @Override
 protected MatrixByteBuffered2x2DType newMatrixAtIndexFromSize(
     final long size, final long offset) {
   final ByteBuffer buf = ByteBuffer.allocate((int) size);
   final MatrixByteBuffered2x2DType mr =
       MatrixByteBufferedM2x2D.newMatrixFromByteBuffer(buf, offset);
   return mr;
 }
  @Test
  public void testImplementationSpecificMemoryLayout0() {
    final ByteBuffer b = ByteBuffer.allocate(4 * 8);
    b.order(ByteOrder.BIG_ENDIAN);

    final MatrixByteBuffered2x2DType m = MatrixByteBufferedM2x2D.newMatrixFromByteBuffer(b, 0L);

    m.setRowColumnD(0, 0, Double.longBitsToDouble(0x0102030405060708L));
    m.setRowColumnD(1, 0, Double.longBitsToDouble(0x1112131415161718L));

    m.setRowColumnD(0, 1, Double.longBitsToDouble(0x4142434445464748L));
    m.setRowColumnD(1, 1, Double.longBitsToDouble(0x5152535455565758L));

    Assert.assertEquals(0x0102030405060708L, b.getLong(0));
    Assert.assertEquals(0x1112131415161718L, b.getLong(8));

    Assert.assertEquals(0x4142434445464748L, b.getLong(16));
    Assert.assertEquals(0x5152535455565758L, b.getLong(24));
  }