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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) 2006-2008 Benoit Jacob <jacob@math.jussieu.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_CAST_H
#define EIGEN_CAST_H
/** \class Cast
*
* \brief Expression with casted scalar type
*
* \param NewScalar the new scalar type
* \param MatrixType the type of the object in which we are casting the scalar type
*
* This class represents an expression where we are casting the scalar type to a new
* type. It is the return type of MatrixBase::cast() and most of the time this is the
* only way it is used.
*
* However, if you want to write a function returning such an expression, you
* will need to use this class.
*
* Here is an example illustrating this:
* \include class_Cast.cpp
* Output: \verbinclude class_Cast.out
*
* \sa MatrixBase::cast()
*/
template<typename NewScalar, typename MatrixType> class Cast : NoOperatorEquals,
public MatrixBase<NewScalar, Cast<NewScalar, MatrixType> >
{
public:
typedef NewScalar Scalar;
typedef typename MatrixType::AsArg MatRef;
friend class MatrixBase<Scalar, Cast>;
friend class MatrixBase<Scalar, Cast>::Traits;
typedef MatrixBase<Scalar, Cast> Base;
Cast(const MatRef& matrix) : m_matrix(matrix) {}
private:
enum {
RowsAtCompileTime = MatrixType::Traits::RowsAtCompileTime,
ColsAtCompileTime = MatrixType::Traits::ColsAtCompileTime,
MaxRowsAtCompileTime = MatrixType::Traits::MaxRowsAtCompileTime,
MaxColsAtCompileTime = MatrixType::Traits::MaxColsAtCompileTime
};
const Cast& _asArg() const { return *this; }
int _rows() const { return m_matrix.rows(); }
int _cols() const { return m_matrix.cols(); }
NewScalar _coeff(int row, int col) const
{
return static_cast<NewScalar>(m_matrix.coeff(row, col));
}
protected:
const MatRef m_matrix;
};
/** \returns an expression of *this with the \a Scalar type casted to
* \a NewScalar.
*
* The template parameter \a NewScalar is the type we are casting the scalars to.
*
* Example: \include MatrixBase_cast.cpp
* Output: \verbinclude MatrixBase_cast.out
*
* \sa class Cast
*/
template<typename Scalar, typename Derived>
template<typename NewScalar>
const Cast<NewScalar, Derived>
MatrixBase<Scalar, Derived>::cast() const
{
return Cast<NewScalar, Derived>(asArg());
}
#endif // EIGEN_CAST_H
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