include/tools/fract.hxx

   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 #ifndef _FRACT_HXX
  20 #define _FRACT_HXX
  21
  22 #include "tools/toolsdllapi.h"
  23 #include <tools/solar.h>
  24
  25 class SvStream;
  26
  27 class TOOLS_DLLPUBLIC SAL_WARN_UNUSED Fraction
  28 {
  29 private:
  30     long            nNumerator;
  31     long            nDenominator;
  32
  33 public:
  34                     Fraction() { nNumerator = 0; nDenominator = 1; }
  35                     Fraction( const Fraction & rFrac );
  36                     Fraction( long nNum, long nDen=1 );
  37                     Fraction( double dVal );
  38
  39     bool            IsValid() const;
  40
  41     long            GetNumerator() const { return nNumerator; }
  42     long            GetDenominator() const { return nDenominator; }
  43
  44     operator        long() const;
  45     operator        double() const;
  46
  47     Fraction&       operator=( const Fraction& rfrFrac );
  48
  49     Fraction&       operator+=( const Fraction& rfrFrac );
  50     Fraction&       operator-=( const Fraction& rfrFrac );
  51     Fraction&       operator*=( const Fraction& rfrFrac );
  52     Fraction&       operator/=( const Fraction& rfrFrac );
  53
  54     void            ReduceInaccurate( unsigned nSignificantBits );
  55
  56     friend inline   Fraction operator+( const Fraction& rVal1, const Fraction& rVal2 );
  57     friend inline   Fraction operator-( const Fraction& rVal1, const Fraction& rVal2 );
  58     friend inline   Fraction operator*( const Fraction& rVal1, const Fraction& rVal2 );
  59     friend inline   Fraction operator/( const Fraction& rVal1, const Fraction& rVal2 );
  60
  61     TOOLS_DLLPUBLIC friend          bool operator==( const Fraction& rVal1, const Fraction& rVal2 );
  62     friend inline   bool operator!=( const Fraction& rVal1, const Fraction& rVal2 );
  63     TOOLS_DLLPUBLIC friend          bool operator< ( const Fraction& rVal1, const Fraction& rVal2 );
  64     TOOLS_DLLPUBLIC friend          bool operator> ( const Fraction& rVal1, const Fraction& rVal2 );
  65     friend inline   bool operator<=( const Fraction& rVal1, const Fraction& rVal2 );
  66     friend inline   bool operator>=( const Fraction& rVal1, const Fraction& rVal2 );
  67
  68     TOOLS_DLLPUBLIC friend SvStream& operator>>( SvStream& rIStream, Fraction& rFract );
  69     TOOLS_DLLPUBLIC friend SvStream& operator<<( SvStream& rOStream, const Fraction& rFract );
  70 };
  71
  72 inline Fraction::Fraction( const Fraction& rFrac )
  73 {
  74     nNumerator   = rFrac.nNumerator;
  75     nDenominator = rFrac.nDenominator;
  76 }
  77
  78 inline Fraction& Fraction::operator=( const Fraction& rFrac )
  79 {
  80     nNumerator   = rFrac.nNumerator;
  81     nDenominator = rFrac.nDenominator;
  82     return *this;
  83 }
  84
  85 inline bool Fraction::IsValid() const
  86 {
  87     return (nDenominator > 0);
  88 }
  89
  90 inline Fraction::operator long() const
  91 {
  92     if ( nDenominator > 0 )
  93         return (nNumerator / nDenominator);
  94     else
  95         return 0;
  96 }
  97
  98 inline Fraction operator+( const Fraction& rVal1, const Fraction& rVal2 )
  99 {
 100     Fraction aErg( rVal1 );
 101     aErg += rVal2;
 102     return aErg;
 103 }
 104
 105 inline Fraction operator-( const Fraction& rVal1, const Fraction& rVal2 )
 106 {
 107     Fraction aErg( rVal1 );
 108     aErg -= rVal2;
 109     return aErg;
 110 }
 111
 112 inline Fraction operator*( const Fraction& rVal1, const Fraction& rVal2 )
 113 {
 114     Fraction aErg( rVal1 );
 115     aErg *= rVal2;
 116     return aErg;
 117 }
 118
 119 inline Fraction operator/( const Fraction& rVal1, const Fraction& rVal2 )
 120 {
 121     Fraction aErg( rVal1 );
 122     aErg /= rVal2;
 123     return aErg;
 124 }
 125
 126 inline bool operator !=( const Fraction& rVal1, const Fraction& rVal2 )
 127 {
 128     return !(rVal1 == rVal2);
 129 }
 130
 131 inline bool operator <=( const Fraction& rVal1, const Fraction& rVal2 )
 132 {
 133     return !(rVal1 > rVal2);
 134 }
 135
 136 inline bool operator >=( const Fraction& rVal1, const Fraction& rVal2 )
 137 {
 138     return !(rVal1 < rVal2);
 139 }
 140
 141 #endif
 142
 143 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */