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.
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   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 INCLUDED_TOOLS_FRACT_HXX
  20 #define INCLUDED_TOOLS_FRACT_HXX
  21
  22 #include <sal/types.h>
  23 #include <tools/toolsdllapi.h>
  24
  25 class SvStream;
  26
  27 // This class uses the platform defined type 'long' as valid values but do all
  28 // calculations using sal_Int64 with checks for 'long' overflows.
  29 class TOOLS_DLLPUBLIC SAL_WARN_UNUSED Fraction
  30 {
  31     struct Impl;
  32
  33     Impl* mpImpl;
  34
  35     bool            HasOverflowValue();
  36
  37 public:
  38                     Fraction();
  39                     Fraction( const Fraction & rFrac );
  40                     Fraction( long nNum, long nDen=1 );
  41                     Fraction( double dVal );
  42                     ~Fraction();
  43
  44     bool            IsValid() const;
  45
  46     long            GetNumerator() const;
  47     long            GetDenominator() const;
  48
  49     operator        long() const;
  50     operator        double() const;
  51
  52     Fraction&       operator=( const Fraction& rfrFrac );
  53
  54     Fraction&       operator+=( const Fraction& rfrFrac );
  55     Fraction&       operator-=( const Fraction& rfrFrac );
  56     Fraction&       operator*=( const Fraction& rfrFrac );
  57     Fraction&       operator/=( const Fraction& rfrFrac );
  58
  59     void            ReduceInaccurate( unsigned nSignificantBits );
  60
  61     TOOLS_DLLPUBLIC friend Fraction operator+( const Fraction& rVal1, const Fraction& rVal2 );
  62     TOOLS_DLLPUBLIC friend Fraction operator-( const Fraction& rVal1, const Fraction& rVal2 );
  63     TOOLS_DLLPUBLIC friend Fraction operator*( const Fraction& rVal1, const Fraction& rVal2 );
  64     TOOLS_DLLPUBLIC friend Fraction operator/( const Fraction& rVal1, const Fraction& rVal2 );
  65
  66     TOOLS_DLLPUBLIC friend bool operator==( const Fraction& rVal1, const Fraction& rVal2 );
  67     TOOLS_DLLPUBLIC friend bool operator!=( const Fraction& rVal1, const Fraction& rVal2 );
  68     TOOLS_DLLPUBLIC friend bool operator< ( const Fraction& rVal1, const Fraction& rVal2 );
  69     TOOLS_DLLPUBLIC friend bool operator> ( const Fraction& rVal1, const Fraction& rVal2 );
  70     TOOLS_DLLPUBLIC friend bool operator<=( const Fraction& rVal1, const Fraction& rVal2 );
  71     TOOLS_DLLPUBLIC friend bool operator>=( const Fraction& rVal1, const Fraction& rVal2 );
  72
  73     TOOLS_DLLPUBLIC friend SvStream& ReadFraction( SvStream& rIStream, Fraction& rFract );
  74     TOOLS_DLLPUBLIC friend SvStream& WriteFraction( SvStream& rOStream, const Fraction& rFract );
  75 };
  76
  77 TOOLS_DLLPUBLIC Fraction operator+( const Fraction& rVal1, const Fraction& rVal2 );
  78 TOOLS_DLLPUBLIC Fraction operator-( const Fraction& rVal1, const Fraction& rVal2 );
  79 TOOLS_DLLPUBLIC Fraction operator*( const Fraction& rVal1, const Fraction& rVal2 );
  80 TOOLS_DLLPUBLIC Fraction operator/( const Fraction& rVal1, const Fraction& rVal2 );
  81 TOOLS_DLLPUBLIC bool operator !=( const Fraction& rVal1, const Fraction& rVal2 );
  82 TOOLS_DLLPUBLIC bool operator <=( const Fraction& rVal1, const Fraction& rVal2 );
  83 TOOLS_DLLPUBLIC bool operator >=( const Fraction& rVal1, const Fraction& rVal2 );
  84
  85 #endif
  86
  87 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */