Line data    Source code

       1             : /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
       2             : /*
       3             :  * This file is part of the LibreOffice project.
       4             :  *
       5             :  * This Source Code Form is subject to the terms of the Mozilla Public
       6             :  * License, v. 2.0. If a copy of the MPL was not distributed with this
       7             :  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
       8             :  *
       9             :  * This file incorporates work covered by the following license notice:
      10             :  *
      11             :  *   Licensed to the Apache Software Foundation (ASF) under one or more
      12             :  *   contributor license agreements. See the NOTICE file distributed
      13             :  *   with this work for additional information regarding copyright
      14             :  *   ownership. The ASF licenses this file to you under the Apache
      15             :  *   License, Version 2.0 (the "License"); you may not use this file
      16             :  *   except in compliance with the License. You may obtain a copy of
      17             :  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
      18             :  */
      19             : 
      20             : #include <math.h>
      21             : 
      22             : #define PREC_float 1
      23             : #define PREC_double 2
      24             : #define PREC_long_double 3
      25             : 
      26             : template<class T>
      27         105 : bool is_equal(T x, T y, sal_Int16 _nPrec)
      28             : {
      29             :     // due to the fact that this check looks only if both values are equal
      30             :     // we only need to look on one value
      31             : 
      32             :     // 14 digits will announce the checkPrecisionSize
      33             : 
      34             :     sal_Int32 nPRECISION;
      35         105 :     switch(_nPrec)
      36             :     {
      37             :     case PREC_float:
      38          50 :         nPRECISION = 6;
      39          50 :         break;
      40             :     case PREC_double:
      41          55 :         nPRECISION = 14;
      42          55 :         break;
      43             :     case PREC_long_double:
      44           0 :         nPRECISION = 20;
      45           0 :         break;
      46             :     default:
      47           0 :         nPRECISION = 2;
      48             :     }
      49             : 
      50         105 :     if (x < 0)
      51             :     {
      52          41 :         x = -x;
      53             :     }
      54         105 :     if (y < 0)
      55             :     {
      56          41 :         y = -y;
      57             :     }
      58             : 
      59         105 :     if (_nPrec != PREC_long_double)
      60             :     {
      61         105 :         printf("double equal: %.20f\n", x);
      62         105 :         printf("              %.20f\n", y);
      63             :     }
      64             :     //here nPrecOfN is the number after dot
      65         105 :     sal_Int32 nBeforeDot = sal_Int32( log10(x) );
      66         105 :     if ( nBeforeDot < 0)
      67             :     {
      68          10 :          nBeforeDot = 0;
      69             :     }
      70             :     //printf("nPRECISION is  %d\n", nPRECISION);
      71         105 :     sal_Int32 nPrecOfN = -nPRECISION + nBeforeDot;
      72             : 
      73         105 :     if (_nPrec != PREC_long_double)
      74         105 :         printf("nPrecOfN is  %" SAL_PRIdINT32 "\n", nPrecOfN);
      75             : 
      76         105 :     double nPrec = pow(0.1, -nPrecOfN);
      77             : 
      78         105 :     if (_nPrec != PREC_long_double)
      79         105 :         printf("        prec: %.20f\n", nPrec);
      80             : 
      81         105 :     double nDelta = fabs( x - y ) ;
      82             : 
      83         105 :     if (_nPrec != PREC_long_double)
      84             :     {
      85         105 :         printf("       delta: %.20f\n", nDelta);
      86         105 :         printf("       nPrec: %.20f\n", nPrec);
      87         105 :         printf("delta must be less or equal to prec\n\n");
      88             :     }
      89             : 
      90         105 :     if (nDelta > nPrec)
      91             :     {
      92             :         // values are not equal
      93          17 :         return false;
      94             :     }
      95             : 
      96             :     // values are equal
      97          88 :     return true;
      98             : }
      99             : 
     100          50 : bool is_float_equal(float x, float y)
     101             : {
     102          50 :     return is_equal<float>(x, y, PREC_float);
     103             : }
     104          55 : bool is_double_equal(double x, double y)
     105             : {
     106          55 :     return is_equal<double>(x, y, PREC_double);
     107             : }
     108             : 
     109             : /* vim:set shiftwidth=4 softtabstop=4 expandtab: */