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diff --git a/demos/spectrum/3rdparty/fftreal/TestAccuracy.h b/demos/spectrum/3rdparty/fftreal/TestAccuracy.h
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+/*****************************************************************************
+
+ TestAccuracy.h
+ Copyright (c) 2005 Laurent de Soras
+
+--- Legal stuff ---
+
+This library is free software; you can redistribute it and/or
+modify it under the terms of the GNU Lesser General Public
+License as published by the Free Software Foundation; either
+version 2.1 of the License, or (at your option) any later version.
+
+This library is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public
+License along with this library; if not, write to the Free Software
+Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+
+*Tab=3***********************************************************************/
+
+
+
+#if ! defined (TestAccuracy_HEADER_INCLUDED)
+#define TestAccuracy_HEADER_INCLUDED
+
+#if defined (_MSC_VER)
+ #pragma once
+ #pragma warning (4 : 4250) // "Inherits via dominance."
+#endif
+
+
+
+/*\\\ INCLUDE FILES \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
+
+
+
+template <class FO>
+class TestAccuracy
+{
+
+/*\\\ PUBLIC \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
+
+public:
+
+ typedef typename FO::DataType DataType;
+ typedef long double BigFloat; // To get maximum accuracy during intermediate calculations
+
+ static int perform_test_single_object (FO &fft);
+ static int perform_test_d (FO &fft, const char *class_name_0);
+ static int perform_test_i (FO &fft, const char *class_name_0);
+ static int perform_test_di (FO &fft, const char *class_name_0);
+
+
+
+/*\\\ PROTECTED \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
+
+protected:
+
+
+
+/*\\\ PRIVATE \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
+
+private:
+
+ enum { NBR_ACC_TESTS = 10 * 1000 * 1000 };
+ enum { MAX_NBR_TESTS = 10000 };
+
+ static void compute_tf (DataType s [], const DataType x [], long length);
+ static void compute_itf (DataType x [], const DataType s [], long length);
+ static int compare_vect_display (const DataType x_ptr [], const DataType y_ptr [], long len, BigFloat &max_err_rel);
+ static BigFloat
+ compute_power (const DataType x_ptr [], long len);
+ static BigFloat
+ compute_power (const DataType x_ptr [], const DataType y_ptr [], long len);
+ static void compare_vect (const DataType x_ptr [], const DataType y_ptr [], BigFloat &power, long &max_err_pos, long len);
+
+
+
+/*\\\ FORBIDDEN MEMBER FUNCTIONS \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/
+
+private:
+
+ TestAccuracy ();
+ ~TestAccuracy ();
+ TestAccuracy (const TestAccuracy &other);
+ TestAccuracy & operator = (const TestAccuracy &other);
+ bool operator == (const TestAccuracy &other);
+ bool operator != (const TestAccuracy &other);
+
+}; // class TestAccuracy
+
+
+
+#include "TestAccuracy.hpp"
+
+
+
+#endif // TestAccuracy_HEADER_INCLUDED
+
+
+
+/*\\\ EOF \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\*/