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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 <sal/types.h>
#include <tools/toolsdllapi.h>
#include <tools/long.hxx>
#include <ostream>
#include <type_traits>
class SvStream;
class SAL_WARN_UNUSED TOOLS_DLLPUBLIC Fraction final
{
/// these two fields form a boost::rational, but I didn't want to put more boost headers into the global space
sal_Int32 mnNumerator = 0;
sal_Int32 mnDenominator = 1;
bool mbValid = true;
public:
Fraction() = default;
Fraction( const Fraction & rFrac ) = default;
Fraction( Fraction && rFrac ) = default;
explicit Fraction( double dVal );
Fraction( double nNum, double nDen );
Fraction( sal_Int64 nNum, sal_Int64 nDen );
// just to prevent ambiguity between the sal_Int64 and double constructors
template<typename T1, typename T2> Fraction(
T1 nNum, T2 nDen,
typename std::enable_if<std::is_integral<T1>::value && std::is_integral<T2>::value, int>::type = 0)
: Fraction( sal_Int64(nNum), sal_Int64(nDen) ) {}
bool IsValid() const { return mbValid; }
sal_Int32 GetNumerator() const;
sal_Int32 GetDenominator() const;
explicit operator sal_Int32() const;
#if SAL_TYPES_SIZEOFPOINTER == 8
explicit operator ::tools::Long() const { return operator sal_Int32(); }
#endif
explicit operator double() const;
Fraction& operator=( const Fraction& rfrFrac ) = default;
Fraction& operator=( Fraction&& rfrFrac ) = default;
Fraction& operator=( double v ) { return operator=(Fraction(v)); }
Fraction& operator+=( const Fraction& rfrFrac );
Fraction& operator-=( const Fraction& rfrFrac );
Fraction& operator*=( const Fraction& rfrFrac );
Fraction& operator/=( const Fraction& rfrFrac );
Fraction& operator+=( double v ) { return operator+=(Fraction(v)); }
Fraction& operator-=( double v ) { return operator-=(Fraction(v)); }
Fraction& operator*=( double v ) { return operator*=(Fraction(v)); }
Fraction& operator/=( double v ) { return operator/=(Fraction(v)); }
void ReduceInaccurate( unsigned nSignificantBits );
/// Multiply the two fractions represented here and reduce inaccuracy to 32-bits, used by vcl
static Fraction MakeFraction(tools::Long nN1, tools::Long nN2, tools::Long nD1, tools::Long nD2);
// Compute value usable as hash.
size_t GetHashValue() const;
TOOLS_DLLPUBLIC friend Fraction operator+( const Fraction& rVal1, const Fraction& rVal2 );
TOOLS_DLLPUBLIC friend Fraction operator-( const Fraction& rVal1, const Fraction& rVal2 );
TOOLS_DLLPUBLIC friend Fraction operator*( const Fraction& rVal1, const Fraction& rVal2 );
TOOLS_DLLPUBLIC friend Fraction 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 );
TOOLS_DLLPUBLIC friend 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 );
TOOLS_DLLPUBLIC friend bool operator>=( const Fraction& rVal1, const Fraction& rVal2 );
};
TOOLS_DLLPUBLIC Fraction operator+( const Fraction& rVal1, const Fraction& rVal2 );
TOOLS_DLLPUBLIC Fraction operator-( const Fraction& rVal1, const Fraction& rVal2 );
TOOLS_DLLPUBLIC Fraction operator*( const Fraction& rVal1, const Fraction& rVal2 );
TOOLS_DLLPUBLIC Fraction operator/( const Fraction& rVal1, const Fraction& rVal2 );
TOOLS_DLLPUBLIC bool operator !=( const Fraction& rVal1, const Fraction& rVal2 );
TOOLS_DLLPUBLIC bool operator <=( const Fraction& rVal1, const Fraction& rVal2 );
TOOLS_DLLPUBLIC bool operator >=( const Fraction& rVal1, const Fraction& rVal2 );
inline Fraction operator+( double v1, const Fraction& rVal2 ) { return Fraction(v1) + rVal2; }
inline Fraction operator-( double v1, const Fraction& rVal2 ) { return Fraction(v1) - rVal2; }
inline Fraction operator*( double v1, const Fraction& rVal2 ) { return Fraction(v1) * rVal2; }
inline Fraction operator/( double v1, const Fraction& rVal2 ) { return Fraction(v1) / rVal2; }
inline Fraction operator+( const Fraction& rVal1, double v2 ) { return rVal1 + Fraction(v2); }
inline Fraction operator-( const Fraction& rVal1, double v2 ) { return rVal1 - Fraction(v2); }
inline Fraction operator*( const Fraction& rVal1, double v2 ) { return rVal1 * Fraction(v2); }
inline Fraction operator/( const Fraction& rVal1, double v2 ) { return rVal1 / Fraction(v2); }
template<typename charT, typename traits>
inline std::basic_ostream<charT, traits> & operator <<(
std::basic_ostream<charT, traits> & rStream, const Fraction& rFraction)
{
rStream << "(" << rFraction.GetNumerator() << "/" << rFraction.GetDenominator() << ")";
return rStream;
}
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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