527 lines
13 KiB
C++
Executable File
527 lines
13 KiB
C++
Executable File
/****************************************************************************
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* Core Library Version 1.7, August 2004
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* Copyright (c) 1995-2004 Exact Computation Project
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* All rights reserved.
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*
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* This file is part of CGAL (www.cgal.org).
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* You can redistribute it and/or modify it under the terms of the GNU
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* Lesser General Public License as published by the Free Software Foundation,
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* either version 3 of the License, or (at your option) any later version.
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*
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* Licensees holding a valid commercial license may use this file in
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* accordance with the commercial license agreement provided with the
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* software.
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*
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* This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
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* WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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*
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*
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* File: RealRep.h
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* Synopsis:
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* Internal Representation for Real
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*
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* Written by
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* Koji Ouchi <ouchi@simulation.nyu.edu>
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* Chee Yap <yap@cs.nyu.edu>
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* Chen Li <chenli@cs.nyu.edu>
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* Zilin Du <zilin@cs.nyu.edu>
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* Sylvain Pion <pion@cs.nyu.edu>
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*
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* WWW URL: http://cs.nyu.edu/exact/
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* Email: exact@cs.nyu.edu
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*
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* $URL$
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* $Id$
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* SPDX-License-Identifier: LGPL-3.0+
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***************************************************************************/
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#ifndef _CORE_REALREP_H_
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#define _CORE_REALREP_H_
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#include "BigFloat.h"
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namespace CORE {
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class Real;
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class RealRep {
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public:
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extLong mostSignificantBit;
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public:
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RealRep() : refCount(1) {}
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virtual ~RealRep() {}
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virtual int ID() const = 0;
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virtual long longValue() const = 0;
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virtual double doubleValue() const = 0;
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virtual BigInt BigIntValue() const = 0;
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virtual BigRat BigRatValue() const = 0;
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virtual BigFloat BigFloatValue() const = 0;
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virtual BigFloat approx(const extLong&, const extLong&) const = 0;
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virtual Real operator-() const = 0;
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virtual bool isExact() const = 0;
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virtual int sgn() const = 0;
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virtual bool isZeroIn() const = 0;
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virtual BigFloat sqrt(const extLong&) const = 0;
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virtual BigFloat sqrt(const extLong&, const BigFloat&) const = 0;
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virtual void ULV_E(extLong &, extLong&, extLong&,
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extLong&, extLong&, extLong&) const = 0;
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virtual extLong flrLgErr() const = 0;
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virtual extLong clLgErr() const = 0;
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virtual unsigned long degree() const = 0;
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virtual unsigned long length() const = 0;
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virtual unsigned long height() const = 0;
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virtual std::string toString(long prec, bool sci) const = 0;
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virtual std::ostream& operator<<(std::ostream& o) const = 0;
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public:
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void incRef() {
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++refCount;
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}
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void decRef() {
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if (--refCount == 0)
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delete this;
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}
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int getRefCount() const {
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return refCount;
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}
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private:
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int refCount;
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};//realRep class
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template <class T>
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class Realbase_for : public RealRep {
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public:
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CORE_NEW(Realbase_for)
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CORE_DELETE(Realbase_for)
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Realbase_for(const T& k);
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~Realbase_for() {}
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int ID() const;
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long longValue() const {
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return ker.longValue();
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}
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double doubleValue() const {
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return ker.doubleValue();
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}
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BigInt BigIntValue() const {
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return BigInt(ker);
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}
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BigRat BigRatValue() const {
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return BigRat(ker);
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}
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BigFloat BigFloatValue() const {
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return BigFloat(ker);
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}
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BigFloat approx(const extLong&, const extLong&) const;
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Real operator-() const;
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bool isExact() const {
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return true;
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}
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int sgn() const {
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return ker > 0.0 ? 1 : ( ker == 0.0 ? 0 : -1);
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}
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bool isZeroIn() const {
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return ker == 0.0;
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}
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BigFloat sqrt(const extLong&) const;
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BigFloat sqrt(const extLong&, const BigFloat&) const;
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void ULV_E(extLong &, extLong&, extLong&, extLong&, extLong&, extLong&) const;
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extLong flrLgErr() const {
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return CORE_negInfty;
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}
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extLong clLgErr() const {
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return CORE_negInfty;
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}
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unsigned long degree() const {
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return 1;
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}
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unsigned long length() const;
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unsigned long height() const;
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std::string toString(long, bool) const {
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std::stringstream st;
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st << ker;
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return st.str();
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}
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std::ostream& operator<<(std::ostream& o) const {
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return o << ker;
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}
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private:
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T ker;
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};//Realbase_for class
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template <class T>
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void * Realbase_for<T>::operator new( size_t size)
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{ return MemoryPool<Realbase_for<T> >::global_allocator().allocate(size); }
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template <class T>
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void Realbase_for<T>::operator delete( void *p, size_t )
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{ MemoryPool<Realbase_for<T> >::global_allocator().free(p); }
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typedef Realbase_for<long> RealLong;
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typedef Realbase_for<double> RealDouble;
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typedef Realbase_for<BigInt> RealBigInt;
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typedef Realbase_for<BigRat> RealBigRat;
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typedef Realbase_for<BigFloat> RealBigFloat;
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enum { REAL_LONG, REAL_DOUBLE, REAL_BIGINT, REAL_BIGRAT, REAL_BIGFLOAT };
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// constructors
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template<>
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inline RealLong::Realbase_for(const long& l) : ker(l) {
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mostSignificantBit = (ker != 0 ) ? extLong(flrLg(ker)) : CORE_negInfty;
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}
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template<>
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inline RealDouble::Realbase_for(const double& d) : ker(d) {
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mostSignificantBit = BigFloat(ker).MSB();
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}
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template<>
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inline RealBigInt::Realbase_for(const BigInt& l) : ker(l) {
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mostSignificantBit = (sign(ker)) ? extLong(floorLg(ker)) : CORE_negInfty;
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}
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template<>
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inline RealBigRat::Realbase_for(const BigRat& l) : ker(l) {
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mostSignificantBit = BigFloat(ker).MSB();
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}
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template<>
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inline RealBigFloat::Realbase_for(const BigFloat& l) : ker(l) {
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mostSignificantBit = ker.MSB();
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}
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// ID()
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template<>
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inline int RealLong::ID() const {
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return REAL_LONG;
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}
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template<>
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inline int RealDouble::ID() const {
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return REAL_DOUBLE;
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}
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template<>
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inline int RealBigInt::ID() const {
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return REAL_BIGINT;
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}
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template<>
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inline int RealBigRat::ID() const {
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return REAL_BIGRAT;
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}
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template<>
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inline int RealBigFloat::ID() const {
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return REAL_BIGFLOAT;
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}
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// cast functions
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template<>
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inline long RealLong::longValue() const {
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return ker;
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}
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template<>
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inline long RealDouble::longValue() const {
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return static_cast<long>(ker);
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}
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template<>
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inline double RealLong::doubleValue() const {
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return static_cast<double>(ker);
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}
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template<>
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inline double RealDouble::doubleValue() const {
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return ker;
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}
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template<>
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inline BigInt RealBigInt::BigIntValue() const {
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return ker;
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}
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template<>
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inline BigInt RealBigRat::BigIntValue() const {
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return ker.BigIntValue();
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}
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template<>
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inline BigInt RealBigFloat::BigIntValue() const {
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return ker.BigIntValue();
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}
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template<>
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inline BigRat RealBigRat::BigRatValue() const {
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return ker;
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}
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template<>
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inline BigRat RealBigFloat::BigRatValue() const {
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return ker.BigRatValue();
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}
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template<>
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inline BigFloat RealBigFloat::BigFloatValue() const {
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return ker;
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}
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// isExact()
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template<>
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inline bool RealBigFloat::isExact() const {
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return ker.isExact();
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}
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// sign()
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template<>
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inline int RealBigInt::sgn() const {
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return sign(ker);
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}
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template<>
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inline int RealBigRat::sgn() const {
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return sign(ker);
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}
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template<>
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inline int RealBigFloat::sgn() const {
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return ker.sign();
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}
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// isZeroIn()
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template<>
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inline bool RealBigInt::isZeroIn() const {
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return sign(ker) == 0;
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}
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template<>
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inline bool RealBigRat::isZeroIn() const {
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return sign(ker) == 0;
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}
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template<>
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inline bool RealBigFloat::isZeroIn() const {
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return ker.isZeroIn();
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}
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// approx
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template <class T>
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inline BigFloat Realbase_for<T>::approx(const extLong& r, const extLong& a) const {
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BigFloat x;
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x.approx(ker, r, a);
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return x;
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}
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template <>
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inline BigFloat RealLong::approx(const extLong& r, const extLong& a) const {
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BigFloat x;
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x.approx(BigInt(ker), r, a);
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return x;
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}
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template <>
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inline BigFloat RealDouble::approx(const extLong& r, const extLong& a) const {
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BigFloat x;
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x.approx(BigRat(ker), r, a);
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return x;
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}
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// sqrt
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template <class T>
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inline BigFloat Realbase_for<T>::sqrt(const extLong& a) const {
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return BigFloat(ker).sqrt(a);
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}
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template <class T>
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inline BigFloat Realbase_for<T>::sqrt(const extLong& a, const BigFloat& A) const {
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return BigFloat(ker).sqrt(a, A);
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}
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// ULV_E()
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template<>
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inline void RealLong::ULV_E(extLong &up, extLong &lp, extLong &v2p,
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extLong &v2m, extLong &v5p, extLong &v5m) const {
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// TODO : extract the power of 5.
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up = lp = v2p = v2m = v5p = v5m = EXTLONG_ZERO;
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if (ker == 0)
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return;
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// Extract the power of 2.
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unsigned long exp = 0;
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unsigned long tmp_ker = ker;
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while ((tmp_ker&1) != 0) {
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tmp_ker = tmp_ker/2;
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++exp;
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}
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up = clLg(tmp_ker);
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lp = 0;
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v2p = exp;
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}
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template<>
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inline void RealDouble::ULV_E(extLong &up, extLong &lp, extLong &v2p,
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extLong &v2m, extLong &v5p, extLong &v5m) const {
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// TODO : can probably be made faster using frexp() or such.
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// TODO : extract the power of 5.
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BigRat R = BigRat(ker);
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up = ceilLg(numerator(R));
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v2m = ceilLg(denominator(R));
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lp = v2p = v5m = v5p = EXTLONG_ZERO;
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}
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template<>
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inline void RealBigInt::ULV_E(extLong &up, extLong &lp, extLong &v2p,
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extLong &v2m, extLong &v5p, extLong &v5m) const {
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up = lp = v2p = v2m = v5p = v5m = EXTLONG_ZERO;
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if (ker == 0)
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return;
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// Extract power of 5.
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int exp5;
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BigInt remainder5;
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getKaryExpo(ker, remainder5, exp5, 5);
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v5p = exp5;
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// Extract power of 2.
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int exp2 = getBinExpo(remainder5);
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up = ceilLg(remainder5) - exp2;
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v2p = exp2;
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}
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template<>
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inline void RealBigRat::ULV_E(extLong &up, extLong &lp, extLong &v2p,
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extLong &v2m, extLong &v5p, extLong &v5m) const {
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up = lp = v2p = v2m = v5p = v5m = EXTLONG_ZERO;
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if (ker == 0)
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return;
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// Extract power of 5.
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int exp5;
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BigInt num5, den5;
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getKaryExpo(numerator(ker), num5, exp5, 5);
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if (exp5 != 0) {
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v5p = exp5;
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den5 = denominator(ker);
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} else {
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getKaryExpo(denominator(ker), den5, exp5, 5);
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v5m = exp5;
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}
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// Now we work with num5/den5.
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int exp2 = getBinExpo(num5);
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if (exp2 != 0) {
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v2p = exp2;
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} else {
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exp2 = getBinExpo(den5);
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v2m = exp2;
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}
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up = ceilLg(num5) - v2p;
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lp = ceilLg(den5) - v2m;
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}
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template<>
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inline void RealBigFloat::ULV_E(extLong &up, extLong &lp, extLong &v2p,
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extLong &v2m, extLong &v5p, extLong &v5m) const {
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// TODO : extract power of 5.
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up = lp = v2p = v2m = v5p = v5m = EXTLONG_ZERO;
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BigRat R = ker.BigRatValue();
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up = ceilLg(numerator(R));
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v2m = ceilLg(denominator(R));
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}
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// flrLgErr && clLgErr
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template<>
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inline extLong RealBigFloat::flrLgErr() const {
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return ker.flrLgErr();
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}
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template<>
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inline extLong RealBigFloat::clLgErr() const {
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return ker.clLgErr();
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}
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// height && length
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template<>
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inline unsigned long RealLong::length() const {
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return clLg(1+ core_abs(ker));
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} // length is (log_2(1+ker^2)) /2.
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template<>
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inline unsigned long RealLong::height() const {
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return clLg(core_max(1L, core_abs(ker)));
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} // height is max{1, |ker|}
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template<>
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inline unsigned long RealDouble::length() const {
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BigRat R = BigRat(ker);
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long ln = 1 + ceilLg(numerator(R));
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long ld = 1 + ceilLg(denominator(R));
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return (ln>ld) ? ln : ld; ///< an upper bound on log_2(sqrt(num^2+den^2))
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}
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template<>
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inline unsigned long RealDouble::height() const {
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BigRat R = BigRat(ker);
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long ln = ceilLg(numerator(R));
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long ld = ceilLg(denominator(R));
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return (ln>ld) ? ln : ld; ///< an upper bound on log_2(max(|num|, |den|))
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}
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template<>
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inline unsigned long RealBigInt::length() const {
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return ceilLg(1 + abs(ker));
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}
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template<>
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inline unsigned long RealBigInt::height() const {
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BigInt r(abs(ker));
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if (r<1)
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r = 1;
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return ceilLg(r);
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}
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template<>
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inline unsigned long RealBigFloat::length() const {
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// Chen Li: A bug fixed.
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// The statement in the older version with the bug was:
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// BigRat R = BigRat(ker);
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// The BigRat(BigFloat) actually is a
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// conversion operator (defined in BigFloat.h), _NOT_
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// an ordinary class constructor! The C++ language
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// specify that an intialization is not an assignment
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// but a constructor operation!
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// Considering that BigRat(BigFloat) is a conversion
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// operator not really a constructor. The programmer's
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// intent is obvious to do an assignment.
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// However, the g++ seems to be confused by the above
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// initialization.
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BigRat R = ker.BigRatValue();
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long ln = 1 + ceilLg(numerator(R));
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long ld = 1 + ceilLg(denominator(R));
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return ( ln > ld ) ? ln : ld;
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}
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template<>
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inline unsigned long RealBigFloat::height() const {
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// Chen Li: A bug fixed. The old statement with the bug was:
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// BigRat R = BigRat(ker);
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// Detailed reasons see above (in RealBigFloat::length()!
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BigRat R = ker.BigRatValue();
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long ln = ceilLg(numerator(R));
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long ld = ceilLg(denominator(R));
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return ( ln > ld ) ? ln : ld;
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}
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template<>
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inline unsigned long RealBigRat::length() const {
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long ln = 1 + ceilLg(numerator(ker));
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long ld = 1 + ceilLg(denominator(ker));
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return ( ln > ld ) ? ln : ld;
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}
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template<>
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inline unsigned long RealBigRat::height() const {
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long ln = ceilLg(numerator(ker));
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long ld = ceilLg(denominator(ker));
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return (ln > ld ) ? ln : ld;
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}
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// toString()
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template<>
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inline std::string RealBigInt::toString(long, bool) const {
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return ker.get_str();
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}
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template<>
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inline std::string RealBigRat::toString(long, bool) const {
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return ker.get_str();
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}
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template<>
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inline std::string RealBigFloat::toString(long prec, bool sci) const {
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return ker.toString(prec, sci);
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}
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} //namespace CORE
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#endif // _CORE_REALREP_H_
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