1 files changed, 120 insertions, 0 deletions
diff --git a/sal/qa/inc/valueequal.hxx b/sal/qa/inc/valueequal.hxx
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+++ b/sal/qa/inc/valueequal.hxx
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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: */