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IndexedViewMethods.h
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IndexedViewMethods.h
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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2017 Gael Guennebaud <gael.guennebaud@inria.fr>
//
// This Source Code Form is subject to the terms of the Mozilla
// Public License v. 2.0. If a copy of the MPL was not distributed
// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
#if !defined(EIGEN_PARSED_BY_DOXYGEN)
// This file is automatically included twice to generate const and non-const versions
#ifndef EIGEN_INDEXED_VIEW_METHOD_2ND_PASS
#define EIGEN_INDEXED_VIEW_METHOD_CONST const
#define EIGEN_INDEXED_VIEW_METHOD_TYPE ConstIndexedViewType
#else
#define EIGEN_INDEXED_VIEW_METHOD_CONST
#define EIGEN_INDEXED_VIEW_METHOD_TYPE IndexedViewType
#endif
#ifndef EIGEN_INDEXED_VIEW_METHOD_2ND_PASS
protected:
// define some aliases to ease readability
template<typename Indices>
struct IvcRowType : public internal::IndexedViewCompatibleType<Indices,RowsAtCompileTime> {};
template<typename Indices>
struct IvcColType : public internal::IndexedViewCompatibleType<Indices,ColsAtCompileTime> {};
template<typename Indices>
struct IvcType : public internal::IndexedViewCompatibleType<Indices,SizeAtCompileTime> {};
typedef typename internal::IndexedViewCompatibleType<Index,1>::type IvcIndex;
template<typename Indices>
typename IvcRowType<Indices>::type
ivcRow(const Indices& indices) const {
return internal::makeIndexedViewCompatible(indices, internal::variable_if_dynamic<Index,RowsAtCompileTime>(derived().rows()),Specialized);
}
template<typename Indices>
typename IvcColType<Indices>::type
ivcCol(const Indices& indices) const {
return internal::makeIndexedViewCompatible(indices, internal::variable_if_dynamic<Index,ColsAtCompileTime>(derived().cols()),Specialized);
}
template<typename Indices>
typename IvcColType<Indices>::type
ivcSize(const Indices& indices) const {
return internal::makeIndexedViewCompatible(indices, internal::variable_if_dynamic<Index,SizeAtCompileTime>(derived().size()),Specialized);
}
public:
#endif
template<typename RowIndices, typename ColIndices>
struct EIGEN_INDEXED_VIEW_METHOD_TYPE {
typedef IndexedView<EIGEN_INDEXED_VIEW_METHOD_CONST Derived,
typename IvcRowType<RowIndices>::type,
typename IvcColType<ColIndices>::type> type;
};
// This is the generic version
template<typename RowIndices, typename ColIndices>
typename internal::enable_if<internal::valid_indexed_view_overload<RowIndices,ColIndices>::value
&& internal::traits<typename EIGEN_INDEXED_VIEW_METHOD_TYPE<RowIndices,ColIndices>::type>::ReturnAsIndexedView,
typename EIGEN_INDEXED_VIEW_METHOD_TYPE<RowIndices,ColIndices>::type >::type
operator()(const RowIndices& rowIndices, const ColIndices& colIndices) EIGEN_INDEXED_VIEW_METHOD_CONST
{
return typename EIGEN_INDEXED_VIEW_METHOD_TYPE<RowIndices,ColIndices>::type
(derived(), ivcRow(rowIndices), ivcCol(colIndices));
}
// The following overload returns a Block<> object
template<typename RowIndices, typename ColIndices>
typename internal::enable_if<internal::valid_indexed_view_overload<RowIndices,ColIndices>::value
&& internal::traits<typename EIGEN_INDEXED_VIEW_METHOD_TYPE<RowIndices,ColIndices>::type>::ReturnAsBlock,
typename internal::traits<typename EIGEN_INDEXED_VIEW_METHOD_TYPE<RowIndices,ColIndices>::type>::BlockType>::type
operator()(const RowIndices& rowIndices, const ColIndices& colIndices) EIGEN_INDEXED_VIEW_METHOD_CONST
{
typedef typename internal::traits<typename EIGEN_INDEXED_VIEW_METHOD_TYPE<RowIndices,ColIndices>::type>::BlockType BlockType;
typename IvcRowType<RowIndices>::type actualRowIndices = ivcRow(rowIndices);
typename IvcColType<ColIndices>::type actualColIndices = ivcCol(colIndices);
return BlockType(derived(),
internal::first(actualRowIndices),
internal::first(actualColIndices),
internal::size(actualRowIndices),
internal::size(actualColIndices));
}
// The following overload returns a Scalar
template<typename RowIndices, typename ColIndices>
typename internal::enable_if<internal::valid_indexed_view_overload<RowIndices,ColIndices>::value
&& internal::traits<typename EIGEN_INDEXED_VIEW_METHOD_TYPE<RowIndices,ColIndices>::type>::ReturnAsScalar,
CoeffReturnType >::type
operator()(const RowIndices& rowIndices, const ColIndices& colIndices) EIGEN_INDEXED_VIEW_METHOD_CONST
{
return Base::operator()(internal::eval_expr_given_size(rowIndices,rows()),internal::eval_expr_given_size(colIndices,cols()));
}
#if EIGEN_HAS_STATIC_ARRAY_TEMPLATE
// The following three overloads are needed to handle raw Index[N] arrays.
template<typename RowIndicesT, std::size_t RowIndicesN, typename ColIndices>
IndexedView<EIGEN_INDEXED_VIEW_METHOD_CONST Derived,const RowIndicesT (&)[RowIndicesN],typename IvcColType<ColIndices>::type>
operator()(const RowIndicesT (&rowIndices)[RowIndicesN], const ColIndices& colIndices) EIGEN_INDEXED_VIEW_METHOD_CONST
{
return IndexedView<EIGEN_INDEXED_VIEW_METHOD_CONST Derived,const RowIndicesT (&)[RowIndicesN],typename IvcColType<ColIndices>::type>
(derived(), rowIndices, ivcCol(colIndices));
}
template<typename RowIndices, typename ColIndicesT, std::size_t ColIndicesN>
IndexedView<EIGEN_INDEXED_VIEW_METHOD_CONST Derived,typename IvcRowType<RowIndices>::type, const ColIndicesT (&)[ColIndicesN]>
operator()(const RowIndices& rowIndices, const ColIndicesT (&colIndices)[ColIndicesN]) EIGEN_INDEXED_VIEW_METHOD_CONST
{
return IndexedView<EIGEN_INDEXED_VIEW_METHOD_CONST Derived,typename IvcRowType<RowIndices>::type,const ColIndicesT (&)[ColIndicesN]>
(derived(), ivcRow(rowIndices), colIndices);
}
template<typename RowIndicesT, std::size_t RowIndicesN, typename ColIndicesT, std::size_t ColIndicesN>
IndexedView<EIGEN_INDEXED_VIEW_METHOD_CONST Derived,const RowIndicesT (&)[RowIndicesN], const ColIndicesT (&)[ColIndicesN]>
operator()(const RowIndicesT (&rowIndices)[RowIndicesN], const ColIndicesT (&colIndices)[ColIndicesN]) EIGEN_INDEXED_VIEW_METHOD_CONST
{
return IndexedView<EIGEN_INDEXED_VIEW_METHOD_CONST Derived,const RowIndicesT (&)[RowIndicesN],const ColIndicesT (&)[ColIndicesN]>
(derived(), rowIndices, colIndices);
}
#endif // EIGEN_HAS_STATIC_ARRAY_TEMPLATE
// Overloads for 1D vectors/arrays
template<typename Indices>
typename internal::enable_if<
IsRowMajor && (!(internal::get_compile_time_incr<typename IvcType<Indices>::type>::value==1 || internal::is_valid_index_type<Indices>::value)),
IndexedView<EIGEN_INDEXED_VIEW_METHOD_CONST Derived,IvcIndex,typename IvcType<Indices>::type> >::type
operator()(const Indices& indices) EIGEN_INDEXED_VIEW_METHOD_CONST
{
EIGEN_STATIC_ASSERT_VECTOR_ONLY(Derived)
return IndexedView<EIGEN_INDEXED_VIEW_METHOD_CONST Derived,IvcIndex,typename IvcType<Indices>::type>
(derived(), IvcIndex(0), ivcCol(indices));
}
template<typename Indices>
typename internal::enable_if<
(!IsRowMajor) && (!(internal::get_compile_time_incr<typename IvcType<Indices>::type>::value==1 || internal::is_valid_index_type<Indices>::value)),
IndexedView<EIGEN_INDEXED_VIEW_METHOD_CONST Derived,typename IvcType<Indices>::type,IvcIndex> >::type
operator()(const Indices& indices) EIGEN_INDEXED_VIEW_METHOD_CONST
{
EIGEN_STATIC_ASSERT_VECTOR_ONLY(Derived)
return IndexedView<EIGEN_INDEXED_VIEW_METHOD_CONST Derived,typename IvcType<Indices>::type,IvcIndex>
(derived(), ivcRow(indices), IvcIndex(0));
}
template<typename Indices>
typename internal::enable_if<
(internal::get_compile_time_incr<typename IvcType<Indices>::type>::value==1) && (!internal::is_valid_index_type<Indices>::value) && (!symbolic::is_symbolic<Indices>::value),
VectorBlock<EIGEN_INDEXED_VIEW_METHOD_CONST Derived,internal::array_size<Indices>::value> >::type
operator()(const Indices& indices) EIGEN_INDEXED_VIEW_METHOD_CONST
{
EIGEN_STATIC_ASSERT_VECTOR_ONLY(Derived)
typename IvcType<Indices>::type actualIndices = ivcSize(indices);
return VectorBlock<EIGEN_INDEXED_VIEW_METHOD_CONST Derived,internal::array_size<Indices>::value>
(derived(), internal::first(actualIndices), internal::size(actualIndices));
}
template<typename IndexType>
typename internal::enable_if<symbolic::is_symbolic<IndexType>::value, CoeffReturnType >::type
operator()(const IndexType& id) EIGEN_INDEXED_VIEW_METHOD_CONST
{
return Base::operator()(internal::eval_expr_given_size(id,size()));
}
#if EIGEN_HAS_STATIC_ARRAY_TEMPLATE
template<typename IndicesT, std::size_t IndicesN>
typename internal::enable_if<IsRowMajor,
IndexedView<EIGEN_INDEXED_VIEW_METHOD_CONST Derived,IvcIndex,const IndicesT (&)[IndicesN]> >::type
operator()(const IndicesT (&indices)[IndicesN]) EIGEN_INDEXED_VIEW_METHOD_CONST
{
EIGEN_STATIC_ASSERT_VECTOR_ONLY(Derived)
return IndexedView<EIGEN_INDEXED_VIEW_METHOD_CONST Derived,IvcIndex,const IndicesT (&)[IndicesN]>
(derived(), IvcIndex(0), indices);
}
template<typename IndicesT, std::size_t IndicesN>
typename internal::enable_if<!IsRowMajor,
IndexedView<EIGEN_INDEXED_VIEW_METHOD_CONST Derived,const IndicesT (&)[IndicesN],IvcIndex> >::type
operator()(const IndicesT (&indices)[IndicesN]) EIGEN_INDEXED_VIEW_METHOD_CONST
{
EIGEN_STATIC_ASSERT_VECTOR_ONLY(Derived)
return IndexedView<EIGEN_INDEXED_VIEW_METHOD_CONST Derived,const IndicesT (&)[IndicesN],IvcIndex>
(derived(), indices, IvcIndex(0));
}
#endif // EIGEN_HAS_STATIC_ARRAY_TEMPLATE
#undef EIGEN_INDEXED_VIEW_METHOD_CONST
#undef EIGEN_INDEXED_VIEW_METHOD_TYPE
#ifndef EIGEN_INDEXED_VIEW_METHOD_2ND_PASS
#define EIGEN_INDEXED_VIEW_METHOD_2ND_PASS
#include "IndexedViewMethods.h"
#undef EIGEN_INDEXED_VIEW_METHOD_2ND_PASS
#endif
#else // EIGEN_PARSED_BY_DOXYGEN
/**
* \returns a generic submatrix view defined by the rows and columns indexed \a rowIndices and \a colIndices respectively.
*
* Each parameter must either be:
* - An integer indexing a single row or column
* - Eigen::all indexing the full set of respective rows or columns in increasing order
* - An ArithmeticSequence as returned by the Eigen::seq and Eigen::seqN functions
* - Any %Eigen's vector/array of integers or expressions
* - Plain C arrays: \c int[N]
* - And more generally any type exposing the following two member functions:
* \code
* <integral type> operator[](<integral type>) const;
* <integral type> size() const;
* \endcode
* where \c <integral \c type> stands for any integer type compatible with Eigen::Index (i.e. \c std::ptrdiff_t).
*
* The last statement implies compatibility with \c std::vector, \c std::valarray, \c std::array, many of the Range-v3's ranges, etc.
*
* If the submatrix can be represented using a starting position \c (i,j) and positive sizes \c (rows,columns), then this
* method will returns a Block object after extraction of the relevant information from the passed arguments. This is the case
* when all arguments are either:
* - An integer
* - Eigen::all
* - An ArithmeticSequence with compile-time increment strictly equal to 1, as returned by Eigen::seq(a,b), and Eigen::seqN(a,N).
*
* Otherwise a more general IndexedView<Derived,RowIndices',ColIndices'> object will be returned, after conversion of the inputs
* to more suitable types \c RowIndices' and \c ColIndices'.
*
* For 1D vectors and arrays, you better use the operator()(const Indices&) overload, which behave the same way but taking a single parameter.
*
* See also this <a href="https://stackoverflow.com/questions/46110917/eigen-replicate-items-along-one-dimension-without-useless-allocations">question</a> and its answer for an example of how to duplicate coefficients.
*
* \sa operator()(const Indices&), class Block, class IndexedView, DenseBase::block(Index,Index,Index,Index)
*/
template<typename RowIndices, typename ColIndices>
IndexedView_or_Block
operator()(const RowIndices& rowIndices, const ColIndices& colIndices);
/** This is an overload of operator()(const RowIndices&, const ColIndices&) for 1D vectors or arrays
*
* \only_for_vectors
*/
template<typename Indices>
IndexedView_or_VectorBlock
operator()(const Indices& indices);
#endif // EIGEN_PARSED_BY_DOXYGEN

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