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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed
+ * with this work for additional information regarding copyright
+ * ownership. The ASF licenses this file to you under the Apache
+ * License, Version 2.0 (the "License"); you may not use this file
+ * except in compliance with the License. You may obtain a copy of
+ * the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_SAL_QA_INC_VALUEEQUAL_HXX
+#define INCLUDED_SAL_QA_INC_VALUEEQUAL_HXX
+
+#include <sal/config.h>
+
+#include <cmath>
+
+#define PREC_float 1
+#define PREC_double 2
+#define PREC_long_double 3
+
+template<class T>
+bool is_equal(T x, T y, sal_Int16 _nPrec)
+{
+ if (!(std::isfinite(x) && std::isfinite(y))) {
+ return x == y;
+ }
+
+ // due to the fact that this check looks only if both values are equal
+ // we only need to look on one value
+
+ // 14 digits will announce the checkPrecisionSize
+
+ sal_Int32 nPRECISION;
+ switch(_nPrec)
+ {
+ case PREC_float:
+ nPRECISION = 6;
+ break;
+ case PREC_double:
+ nPRECISION = 14;
+ break;
+ case PREC_long_double:
+ nPRECISION = 20;
+ break;
+ default:
+ nPRECISION = 2;
+ }
+
+ if (x < 0)
+ {
+ x = -x;
+ }
+ if (y < 0)
+ {
+ y = -y;
+ }
+
+ if (_nPrec != PREC_long_double)
+ {
+ printf("double equal: %.20f\n", x);
+ printf(" %.20f\n", y);
+ }
+ //here nPrecOfN is the number after dot
+ sal_Int32 nBeforeDot = sal_Int32( log10(x) );
+ if ( nBeforeDot < 0)
+ {
+ nBeforeDot = 0;
+ }
+ //printf("nPRECISION is %d\n", nPRECISION);
+ sal_Int32 nPrecOfN = -nPRECISION + nBeforeDot;
+
+ if (_nPrec != PREC_long_double)
+ printf("nPrecOfN is %" SAL_PRIdINT32 "\n", nPrecOfN);
+
+ double nPrec = pow(0.1, -nPrecOfN);
+
+ if (_nPrec != PREC_long_double)
+ printf(" prec: %.20f\n", nPrec);
+
+ double nDelta = fabs( x - y ) ;
+
+ if (_nPrec != PREC_long_double)
+ {
+ printf(" delta: %.20f\n", nDelta);
+ printf(" nPrec: %.20f\n", nPrec);
+ printf("delta must be less or equal to prec\n\n");
+ }
+
+ if (nDelta > nPrec)
+ {
+ // values are not equal
+ return false;
+ }
+
+ // values are equal
+ return true;
+}
+
+bool is_float_equal(float x, float y)
+{
+ return is_equal<float>(x, y, PREC_float);
+}
+bool is_double_equal(double x, double y)
+{
+ return is_equal<double>(x, y, PREC_double);
+}
+
+#endif // INCLUDED_SAL_QA_INC_VALUEEQUAL_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */