127 lines
4.2 KiB
C++
127 lines
4.2 KiB
C++
// This file is part of Eigen, a lightweight C++ template library
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// for linear algebra.
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//
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// Copyright (C) 2008-2009 Gael Guennebaud <gael.guennebaud@inria.fr>
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// Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@gmail.com>
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//
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// This Source Code Form is subject to the terms of the Mozilla
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// Public License v. 2.0. If a copy of the MPL was not distributed
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// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
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#ifndef EIGEN_BLOCK2_H
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#define EIGEN_BLOCK2_H
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namespace Eigen {
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/** \returns a dynamic-size expression of a corner of *this.
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*
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* \param type the type of corner. Can be \a Eigen::TopLeft, \a Eigen::TopRight,
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* \a Eigen::BottomLeft, \a Eigen::BottomRight.
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* \param cRows the number of rows in the corner
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* \param cCols the number of columns in the corner
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*
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* Example: \include MatrixBase_corner_enum_int_int.cpp
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* Output: \verbinclude MatrixBase_corner_enum_int_int.out
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*
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* \note Even though the returned expression has dynamic size, in the case
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* when it is applied to a fixed-size matrix, it inherits a fixed maximal size,
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* which means that evaluating it does not cause a dynamic memory allocation.
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*
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* \sa class Block, block(Index,Index,Index,Index)
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*/
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template<typename Derived>
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inline Block<Derived> DenseBase<Derived>
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::corner(CornerType type, Index cRows, Index cCols)
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{
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switch(type)
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{
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default:
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eigen_assert(false && "Bad corner type.");
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case TopLeft:
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return Block<Derived>(derived(), 0, 0, cRows, cCols);
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case TopRight:
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return Block<Derived>(derived(), 0, cols() - cCols, cRows, cCols);
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case BottomLeft:
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return Block<Derived>(derived(), rows() - cRows, 0, cRows, cCols);
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case BottomRight:
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return Block<Derived>(derived(), rows() - cRows, cols() - cCols, cRows, cCols);
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}
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}
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/** This is the const version of corner(CornerType, Index, Index).*/
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template<typename Derived>
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inline const Block<Derived>
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DenseBase<Derived>::corner(CornerType type, Index cRows, Index cCols) const
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{
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switch(type)
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{
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default:
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eigen_assert(false && "Bad corner type.");
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case TopLeft:
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return Block<Derived>(derived(), 0, 0, cRows, cCols);
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case TopRight:
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return Block<Derived>(derived(), 0, cols() - cCols, cRows, cCols);
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case BottomLeft:
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return Block<Derived>(derived(), rows() - cRows, 0, cRows, cCols);
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case BottomRight:
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return Block<Derived>(derived(), rows() - cRows, cols() - cCols, cRows, cCols);
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}
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}
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/** \returns a fixed-size expression of a corner of *this.
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*
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* \param type the type of corner. Can be \a Eigen::TopLeft, \a Eigen::TopRight,
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* \a Eigen::BottomLeft, \a Eigen::BottomRight.
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*
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* The template parameters CRows and CCols arethe number of rows and columns in the corner.
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*
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* Example: \include MatrixBase_template_int_int_corner_enum.cpp
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* Output: \verbinclude MatrixBase_template_int_int_corner_enum.out
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*
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* \sa class Block, block(Index,Index,Index,Index)
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*/
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template<typename Derived>
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template<int CRows, int CCols>
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inline Block<Derived, CRows, CCols>
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DenseBase<Derived>::corner(CornerType type)
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{
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switch(type)
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{
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default:
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eigen_assert(false && "Bad corner type.");
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case TopLeft:
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return Block<Derived, CRows, CCols>(derived(), 0, 0);
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case TopRight:
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return Block<Derived, CRows, CCols>(derived(), 0, cols() - CCols);
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case BottomLeft:
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return Block<Derived, CRows, CCols>(derived(), rows() - CRows, 0);
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case BottomRight:
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return Block<Derived, CRows, CCols>(derived(), rows() - CRows, cols() - CCols);
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}
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}
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/** This is the const version of corner<int, int>(CornerType).*/
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template<typename Derived>
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template<int CRows, int CCols>
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inline const Block<Derived, CRows, CCols>
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DenseBase<Derived>::corner(CornerType type) const
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{
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switch(type)
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{
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default:
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eigen_assert(false && "Bad corner type.");
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case TopLeft:
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return Block<Derived, CRows, CCols>(derived(), 0, 0);
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case TopRight:
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return Block<Derived, CRows, CCols>(derived(), 0, cols() - CCols);
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case BottomLeft:
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return Block<Derived, CRows, CCols>(derived(), rows() - CRows, 0);
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case BottomRight:
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return Block<Derived, CRows, CCols>(derived(), rows() - CRows, cols() - CCols);
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}
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}
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} // end namespace Eigen
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#endif // EIGEN_BLOCK2_H
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