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56 lines
2.0 KiB
C++
56 lines
2.0 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) 2009 Gael Guennebaud <g.gael@free.fr>
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//
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// Eigen is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 3 of the License, or (at your option) any later version.
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//
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// Alternatively, you can redistribute it and/or
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// modify it under the terms of the GNU General Public License as
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// published by the Free Software Foundation; either version 2 of
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// the License, or (at your option) any later version.
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//
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// Eigen is distributed in the hope that it will be useful, but WITHOUT ANY
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// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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// FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License or 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 Lesser General Public
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// License and a copy of the GNU General Public License along with
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// Eigen. If not, see <http://www.gnu.org/licenses/>.
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#ifndef EIGEN_EXPRESSIONMAKER_H
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#define EIGEN_EXPRESSIONMAKER_H
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// computes the shape of a matrix from its traits flag
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template<typename XprType> struct ei_shape_of
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{
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enum { ret = ei_traits<XprType>::Flags&SparseBit ? IsSparse : IsDense };
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};
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// Since the Sparse module is completely separated from the Core module, there is
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// no way to write the type of a generic expression working for both dense and sparse
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// matrix. Unless we change the overall design, here is a workaround.
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// There is an example in unsuported/Eigen/src/AutoDiff/AutoDiffScalar.
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template<typename Func, typename XprType, int Shape = ei_shape_of<XprType>::ret>
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struct MakeCwiseUnaryOp
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{
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typedef CwiseUnaryOp<Func,XprType> Type;
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};
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template<typename Func, typename A, typename B, int Shape = ei_shape_of<A>::ret>
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struct MakeCwiseBinaryOp
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{
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typedef CwiseBinaryOp<Func,A,B> Type;
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};
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// TODO complete the list
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#endif // EIGEN_EXPRESSIONMAKER_H
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