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| -rw-r--r-- | include/tools/fract.hxx | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/include/tools/fract.hxx b/include/tools/fract.hxx new file mode 100644 index 0000000000..e1305ca8a8 --- /dev/null +++ b/include/tools/fract.hxx @@ -0,0 +1,122 @@ +/* -*- 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: */ |