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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_TOOLS_FRACT_HXX
#define INCLUDED_TOOLS_FRACT_HXX
#include <boost/rational.hpp>
#include <sal/log.hxx>
#include <tools/toolsdllapi.h>
class SvStream;
// This class uses the platform defined type 'long' as valid values but do all
// calculations using sal_Int64 with checks for 'long' overflows.
class TOOLS_DLLPUBLIC SAL_WARN_UNUSED Fraction
{
private:
bool valid;
boost::rational<sal_Int64> value;
bool HasOverflowValue();
public:
Fraction() { valid = true; }
Fraction( const Fraction & rFrac );
Fraction( long nNum, long nDen=1 );
Fraction( double dVal );
bool IsValid() const;
long GetNumerator() const;
long GetDenominator() const;
operator long() const;
operator double() const;
Fraction& operator=( const Fraction& rfrFrac );
Fraction& operator+=( const Fraction& rfrFrac );
Fraction& operator-=( const Fraction& rfrFrac );
Fraction& operator*=( const Fraction& rfrFrac );
Fraction& operator/=( const Fraction& rfrFrac );
void ReduceInaccurate( unsigned nSignificantBits );
friend inline Fraction operator+( const Fraction& rVal1, const Fraction& rVal2 );
friend inline Fraction operator-( const Fraction& rVal1, const Fraction& rVal2 );
friend inline Fraction operator*( const Fraction& rVal1, const Fraction& rVal2 );
friend inline Fraction operator/( const Fraction& rVal1, const Fraction& rVal2 );
TOOLS_DLLPUBLIC friend bool operator==( const Fraction& rVal1, const Fraction& rVal2 );
friend inline bool operator!=( const Fraction& rVal1, const Fraction& rVal2 );
TOOLS_DLLPUBLIC friend bool operator< ( const Fraction& rVal1, const Fraction& rVal2 );
TOOLS_DLLPUBLIC friend bool operator> ( const Fraction& rVal1, const Fraction& rVal2 );
friend inline bool operator<=( const Fraction& rVal1, const Fraction& rVal2 );
friend inline bool operator>=( const Fraction& rVal1, const Fraction& rVal2 );
TOOLS_DLLPUBLIC friend SvStream& ReadFraction( SvStream& rIStream, Fraction& rFract );
TOOLS_DLLPUBLIC friend SvStream& WriteFraction( SvStream& rOStream, const Fraction& rFract );
};
inline Fraction::Fraction( const Fraction& rFrac )
{
valid = rFrac.valid;
if ( valid )
value.assign( rFrac.value.numerator(), rFrac.value.denominator() );
}
inline long Fraction::GetNumerator() const
{
if ( !valid ) {
SAL_WARN( "tools.fraction", "'GetNumerator()' on invalid fraction" );
return 0;
}
return value.numerator();
}
inline long Fraction::GetDenominator() const {
if ( !valid ) {
SAL_WARN( "tools.fraction", "'GetDenominator()' on invalid fraction" );
return -1;
}
return value.denominator();
}
inline Fraction& Fraction::operator=( const Fraction& rFrac )
{
if ( this != &rFrac ) {
valid = rFrac.valid;
if ( valid )
value.assign( rFrac.value.numerator(), rFrac.value.denominator() );
}
return *this;
}
inline bool Fraction::IsValid() const
{
return valid;
}
inline Fraction::operator long() const
{
if ( !valid ) {
SAL_WARN( "tools.fraction", "'operator long()' on invalid fraction" );
return 0;
}
return boost::rational_cast<long>(value);
}
inline Fraction operator+( const Fraction& rVal1, const Fraction& rVal2 )
{
Fraction aErg( rVal1 );
aErg += rVal2;
return aErg;
}
inline Fraction operator-( const Fraction& rVal1, const Fraction& rVal2 )
{
Fraction aErg( rVal1 );
aErg -= rVal2;
return aErg;
}
inline Fraction operator*( const Fraction& rVal1, const Fraction& rVal2 )
{
Fraction aErg( rVal1 );
aErg *= rVal2;
return aErg;
}
inline Fraction operator/( const Fraction& rVal1, const Fraction& rVal2 )
{
Fraction aErg( rVal1 );
aErg /= rVal2;
return aErg;
}
inline bool operator !=( const Fraction& rVal1, const Fraction& rVal2 )
{
return !(rVal1 == rVal2);
}
inline bool operator <=( const Fraction& rVal1, const Fraction& rVal2 )
{
return !(rVal1 > rVal2);
}
inline bool operator >=( const Fraction& rVal1, const Fraction& rVal2 )
{
return !(rVal1 < rVal2);
}
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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