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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_VISITOR_H
#define EIGEN_VISITOR_H
template<typename Visitor, typename Derived, int UnrollCount>
struct ei_visitor_impl
{
enum {
col = (UnrollCount-1) / Derived::RowsAtCompileTime,
row = (UnrollCount-1) % Derived::RowsAtCompileTime
};
inline static void run(const Derived &mat, Visitor& visitor)
{
ei_visitor_impl<Visitor, Derived, UnrollCount-1>::run(mat, visitor);
visitor(mat.coeff(row, col), row, col);
}
};
template<typename Visitor, typename Derived>
struct ei_visitor_impl<Visitor, Derived, 1>
{
inline static void run(const Derived &mat, Visitor& visitor)
{
return visitor.init(mat.coeff(0, 0), 0, 0);
}
};
template<typename Visitor, typename Derived>
struct ei_visitor_impl<Visitor, Derived, Dynamic>
{
inline static void run(const Derived& mat, Visitor& visitor)
{
visitor.init(mat.coeff(0,0), 0, 0);
for(int i = 1; i < mat.rows(); ++i)
visitor(mat.coeff(i, 0), i, 0);
for(int j = 1; j < mat.cols(); ++j)
for(int i = 0; i < mat.rows(); ++i)
visitor(mat.coeff(i, j), i, j);
}
};
/** Applies the visitor \a visitor to the whole coefficients of the matrix or vector.
*
* The template parameter \a Visitor is the type of the visitor and provides the following interface:
* \code
* struct MyVisitor {
* // called for the first coefficient
* void init(const Scalar& value, int i, int j);
* // called for all other coefficients
* void operator() (const Scalar& value, int i, int j);
* };
* \endcode
*
* \note compared to one or two \em for \em loops, visitors offer automatic
* unrolling for small fixed size matrix.
*
* \sa minCoeff(int*,int*), maxCoeff(int*,int*), MatrixBase::redux()
*/
template<typename Derived>
template<typename Visitor>
void MatrixBase<Derived>::visit(Visitor& visitor) const
{
const bool unroll = SizeAtCompileTime * CoeffReadCost
+ (SizeAtCompileTime-1) * ei_functor_traits<Visitor>::Cost
<= EIGEN_UNROLLING_LIMIT;
return ei_visitor_impl<Visitor, Derived,
unroll ? int(SizeAtCompileTime) : Dynamic
>::run(derived(), visitor);
}
/** \internal
* \brief Base class to implement min and max visitors
*/
template <typename Scalar>
struct ei_coeff_visitor
{
int row, col;
Scalar res;
inline void init(const Scalar& value, int i, int j)
{
res = value;
row = i;
col = j;
}
};
/** \internal
* \brief Visitor computing the min coefficient with its value and coordinates
*
* \sa MatrixBase::minCoeff(int*, int*)
*/
template <typename Scalar>
struct ei_min_coeff_visitor : ei_coeff_visitor<Scalar>
{
void operator() (const Scalar& value, int i, int j)
{
if(value < this->res)
{
this->res = value;
this->row = i;
this->col = j;
}
}
};
template<typename Scalar>
struct ei_functor_traits<ei_min_coeff_visitor<Scalar> > {
enum {
Cost = NumTraits<Scalar>::AddCost
};
};
/** \internal
* \brief Visitor computing the max coefficient with its value and coordinates
*
* \sa MatrixBase::maxCoeff(int*, int*)
*/
template <typename Scalar>
struct ei_max_coeff_visitor : ei_coeff_visitor<Scalar>
{
void operator() (const Scalar& value, int i, int j)
{
if(value > this->res)
{
this->res = value;
this->row = i;
this->col = j;
}
}
};
template<typename Scalar>
struct ei_functor_traits<ei_max_coeff_visitor<Scalar> > {
enum {
Cost = NumTraits<Scalar>::AddCost
};
};
/** \returns the minimum of all coefficients of *this
* and puts in *row and *col its location.
*
* \sa MatrixBase::minCoeff(int*), MatrixBase::maxCoeff(int*,int*), MatrixBase::visitor(), MatrixBase::minCoeff()
*/
template<typename Derived>
typename ei_traits<Derived>::Scalar
MatrixBase<Derived>::minCoeff(int* row, int* col) const
{
ei_min_coeff_visitor<Scalar> minVisitor;
this->visit(minVisitor);
*row = minVisitor.row;
if (col) *col = minVisitor.col;
return minVisitor.res;
}
/** \returns the minimum of all coefficients of *this
* and puts in *index its location.
*
* \sa MatrixBase::minCoeff(int*,int*), MatrixBase::maxCoeff(int*,int*), MatrixBase::visitor(), MatrixBase::minCoeff()
*/
template<typename Derived>
typename ei_traits<Derived>::Scalar
MatrixBase<Derived>::minCoeff(int* index) const
{
EIGEN_STATIC_ASSERT_VECTOR_ONLY(Derived)
ei_min_coeff_visitor<Scalar> minVisitor;
this->visit(minVisitor);
*index = (RowsAtCompileTime==1) ? minVisitor.col : minVisitor.row;
return minVisitor.res;
}
/** \returns the maximum of all coefficients of *this
* and puts in *row and *col its location.
*
* \sa MatrixBase::minCoeff(int*,int*), MatrixBase::visitor(), MatrixBase::maxCoeff()
*/
template<typename Derived>
typename ei_traits<Derived>::Scalar
MatrixBase<Derived>::maxCoeff(int* row, int* col) const
{
ei_max_coeff_visitor<Scalar> maxVisitor;
this->visit(maxVisitor);
*row = maxVisitor.row;
if (col) *col = maxVisitor.col;
return maxVisitor.res;
}
/** \returns the maximum of all coefficients of *this
* and puts in *index its location.
*
* \sa MatrixBase::maxCoeff(int*,int*), MatrixBase::minCoeff(int*,int*), MatrixBase::visitor(), MatrixBase::maxCoeff()
*/
template<typename Derived>
typename ei_traits<Derived>::Scalar
MatrixBase<Derived>::maxCoeff(int* index) const
{
EIGEN_STATIC_ASSERT_VECTOR_ONLY(Derived)
ei_max_coeff_visitor<Scalar> maxVisitor;
this->visit(maxVisitor);
*index = (RowsAtCompileTime==1) ? maxVisitor.col : maxVisitor.row;
return maxVisitor.res;
}
#endif // EIGEN_VISITOR_H
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