forked from bartvdbraak/blender
156 lines
4.6 KiB
C++
156 lines
4.6 KiB
C++
/**
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* $Id$
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* ***** BEGIN GPL LICENSE BLOCK *****
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* The Original Code is Copyright (C) 2001-2002 by NaN Holding BV.
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* All rights reserved.
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*
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* The Original Code is: all of this file.
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*
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* Contributor(s): none yet.
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*
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* ***** END GPL LICENSE BLOCK *****
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*/
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#include <math.h>
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#include <iostream>
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template <class T>
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class NM_Scalar {
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public:
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NM_Scalar() {}
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explicit NM_Scalar(T value, T error = 0.0) :
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m_value(value), m_error(error) {}
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T getValue() const { return m_value; }
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T getError() const { return m_error; }
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operator T() const { return m_value; }
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NM_Scalar operator-() const {
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return NM_Scalar<T>(-m_value, m_error);
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}
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NM_Scalar& operator=(T value) {
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m_value = value;
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m_error = 0.0;
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return *this;
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}
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NM_Scalar& operator+=(const NM_Scalar& x) {
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m_value += x.m_value;
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m_error = (fabs(m_value) * (m_error + 1.0) +
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fabs(x.m_value) * (x.m_error + 1.0)) /
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fabs(m_value + x.m_value);
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return *this;
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}
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NM_Scalar& operator-=(const NM_Scalar& x) {
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m_value -= x.m_value;
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m_error = (fabs(m_value) * (m_error + 1.0) +
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fabs(x.m_value) * (x.m_error + 1.0)) /
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fabs(m_value - x.m_value);
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return *this;
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}
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NM_Scalar& operator*=(const NM_Scalar& x) {
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m_value *= x.m_value;
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m_error += x.m_error + 1.0;
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return *this;
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}
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NM_Scalar& operator/=(const NM_Scalar& x) {
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m_value /= x.m_value;
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m_error += x.m_error + 1.0;
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return *this;
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}
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private:
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T m_value;
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T m_error;
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};
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template <class T>
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inline NM_Scalar<T> operator+(const NM_Scalar<T>& x, const NM_Scalar<T>& y) {
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return x.getValue() == 0.0 && y.getValue() == 0.0 ?
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NM_Scalar<T>(0.0, 0.0) :
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NM_Scalar<T>(x.getValue() + y.getValue(),
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(fabs(x.getValue()) * (x.getError() + 1.0) +
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fabs(y.getValue()) * (y.getError() + 1.0)) /
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fabs(x.getValue() + y.getValue()));
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}
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template <class T>
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inline NM_Scalar<T> operator-(const NM_Scalar<T>& x, const NM_Scalar<T>& y) {
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return x.getValue() == 0.0 && y.getValue() == 0.0 ?
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NM_Scalar<T>(0.0, 0.0) :
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NM_Scalar<T>(x.getValue() - y.getValue(),
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(fabs(x.getValue()) * (x.getError() + 1.0) +
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fabs(y.getValue()) * (y.getError() + 1.0)) /
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fabs(x.getValue() - y.getValue()));
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}
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template <class T>
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inline NM_Scalar<T> operator*(const NM_Scalar<T>& x, const NM_Scalar<T>& y) {
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return NM_Scalar<T>(x.getValue() * y.getValue(),
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x.getError() + y.getError() + 1.0);
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}
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template <class T>
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inline NM_Scalar<T> operator/(const NM_Scalar<T>& x, const NM_Scalar<T>& y) {
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return NM_Scalar<T>(x.getValue() / y.getValue(),
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x.getError() + y.getError() + 1.0);
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}
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template <class T>
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inline std::ostream& operator<<(std::ostream& os, const NM_Scalar<T>& x) {
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return os << x.getValue() << '[' << x.getError() << ']';
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}
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template <class T>
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inline NM_Scalar<T> sqrt(const NM_Scalar<T>& x) {
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return NM_Scalar<T>(sqrt(x.getValue()),
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0.5 * x.getError() + 1.0);
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}
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template <class T>
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inline NM_Scalar<T> acos(const NM_Scalar<T>& x) {
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return NM_Scalar<T>(acos(x.getValue()), x.getError() + 1.0);
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}
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template <class T>
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inline NM_Scalar<T> cos(const NM_Scalar<T>& x) {
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return NM_Scalar<T>(cos(x.getValue()), x.getError() + 1.0);
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}
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template <class T>
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inline NM_Scalar<T> sin(const NM_Scalar<T>& x) {
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return NM_Scalar<T>(sin(x.getValue()), x.getError() + 1.0);
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}
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template <class T>
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inline NM_Scalar<T> fabs(const NM_Scalar<T>& x) {
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return NM_Scalar<T>(fabs(x.getValue()), x.getError());
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}
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template <class T>
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inline NM_Scalar<T> pow(const NM_Scalar<T>& x, const NM_Scalar<T>& y) {
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return NM_Scalar<T>(pow(x.getValue(), y.getValue()),
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fabs(y.getValue()) * x.getError() + 1.0);
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}
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