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* added a pseudo expression Array giving access to:

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- matrix-scalar addition/subtraction operators, e.g.:
       m.array() += 0.5;
   - matrix/matrix comparison operators, e.g.:
      if (m1.array() < m2.array()) {}
* fix compilation issues with Transform and gcc < 4.1
This commit is contained in:
Gael Guennebaud
2008-06-20 12:38:03 +00:00
parent e735692e37
commit 54238961d6
8 changed files with 255 additions and 57 deletions
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152
Eigen/src/Array/Array.h Normal file
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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra. Eigen itself is part of the KDE project.
//
// Copyright (C) 2008 Gael Guennebaud <g.gael@free.fr>
//
// Eigen is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 3 of the License, or (at your option) any later version.
//
// Alternatively, you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of
// the License, or (at your option) any later version.
//
// Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License or the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License and a copy of the GNU General Public License along with
// Eigen. If not, see <http://www.gnu.org/licenses/>.
#ifndef EIGEN_ARRAY_H
#define EIGEN_ARRAY_H
/** \class Array
*
* \brief Pseudo expression offering additional features to an expression
*
* \param ExpressionType the type of the object of which we want array related features
*
* This class represents an expression with additional, array related, features.
* It is the return type of MatrixBase::array()
* and most of the time this is the only way it is used.
*
* \sa MatrixBase::array()
*/
template<typename ExpressionType> class Array
{
public:
typedef typename ei_traits<ExpressionType>::Scalar Scalar;
typedef typename ei_meta_if<ei_must_nest_by_value<ExpressionType>::ret,
ExpressionType, const ExpressionType&>::ret ExpressionTypeNested;
// typedef NestByValue<typename ExpressionType::ConstantReturnType> ConstantReturnType;
typedef CwiseUnaryOp<ei_scalar_add_op<Scalar>, ExpressionType> ScalarAddReturnType;
inline Array(const ExpressionType& matrix) : m_matrix(matrix) {}
/** \internal */
inline const ExpressionType& _expression() const { return m_matrix; }
const ScalarAddReturnType
operator+(const Scalar& scalar) const;
/** \relates Array */
friend const ScalarAddReturnType
operator+(const Scalar& scalar, const Array& mat)
{ return mat + scalar; }
ExpressionType& operator+=(const Scalar& scalar);
const ScalarAddReturnType
operator-(const Scalar& scalar) const;
ExpressionType& operator-=(const Scalar& scalar);
/** \returns true if each coeff of \c *this is less than its respective coeff of \a other */
template<typename OtherDerived> bool operator<(const Array<OtherDerived>& other) const
{ return m_matrix.cwiseLessThan(other._expression()).all(); }
/** \returns true if each coeff of \c *this is less or equal to its respective coeff of \a other */
template<typename OtherDerived> bool operator<=(const Array<OtherDerived>& other) const
{ return m_matrix.cwiseLessEqual(other._expression()).all(); }
/** \returns true if each coeff of \c *this is greater to its respective coeff of \a other */
template<typename OtherDerived>
bool operator>(const Array<OtherDerived>& other) const
{ return m_matrix.cwiseGreaterThan(other._expression()).all(); }
/** \returns true if each coeff of \c *this is greater or equal to its respective coeff of \a other */
template<typename OtherDerived>
bool operator>=(const Array<OtherDerived>& other) const
{ return m_matrix.cwiseGreaterEqual(other._expression()).all(); }
protected:
ExpressionTypeNested m_matrix;
};
/** \returns an expression of \c *this with each coeff incremented by the constant \a scalar */
template<typename ExpressionType>
const typename Array<ExpressionType>::ScalarAddReturnType
Array<ExpressionType>::operator+(const Scalar& scalar) const
{
return CwiseUnaryOp<ei_scalar_add_op<Scalar>, ExpressionType>(m_matrix, ei_scalar_add_op<Scalar>(scalar));
}
/** \see operator+ */
template<typename ExpressionType>
ExpressionType& Array<ExpressionType>::operator+=(const Scalar& scalar)
{
m_matrix.const_cast_derived() = *this + scalar;
return m_matrix.const_cast_derived();
}
/** \returns an expression of \c *this with each coeff decremented by the constant \a scalar */
template<typename ExpressionType>
const typename Array<ExpressionType>::ScalarAddReturnType
Array<ExpressionType>::operator-(const Scalar& scalar) const
{
return *this + (-scalar);
}
/** \see operator- */
template<typename ExpressionType>
ExpressionType& Array<ExpressionType>::operator-=(const Scalar& scalar)
{
m_matrix.const_cast_derived() = *this - scalar;
return m_matrix.const_cast_derived();
}
/** \array_module
*
* \returns an Array expression of *this providing additional,
* array related, features.
*
* \sa class Array
*/
template<typename Derived>
inline const Array<Derived>
MatrixBase<Derived>::array() const
{
return derived();
}
/** \array_module
*
* \returns an Array expression of *this providing additional,
* array related, features.
*
* \sa class Array
*/
template<typename Derived>
inline Array<Derived>
MatrixBase<Derived>::array()
{
return derived();
}
#endif // EIGEN_FLAGGED_H