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Eigen  3.4.0
 
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NestByValue.h
1// This file is part of Eigen, a lightweight C++ template library
2// for linear algebra.
3//
4// Copyright (C) 2008 Gael Guennebaud <gael.guennebaud@inria.fr>
5// Copyright (C) 2006-2008 Benoit Jacob <jacob.benoit.1@gmail.com>
6//
7// This Source Code Form is subject to the terms of the Mozilla
8// Public License v. 2.0. If a copy of the MPL was not distributed
9// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
10
11#ifndef EIGEN_NESTBYVALUE_H
12#define EIGEN_NESTBYVALUE_H
13
14namespace Eigen {
15
16namespace internal {
17template<typename ExpressionType>
18struct traits<NestByValue<ExpressionType> > : public traits<ExpressionType>
19{
20 enum {
21 Flags = traits<ExpressionType>::Flags & ~NestByRefBit
22 };
23};
24}
25
38template<typename ExpressionType> class NestByValue
39 : public internal::dense_xpr_base< NestByValue<ExpressionType> >::type
40{
41 public:
42
43 typedef typename internal::dense_xpr_base<NestByValue>::type Base;
44 EIGEN_DENSE_PUBLIC_INTERFACE(NestByValue)
45
46 EIGEN_DEVICE_FUNC explicit inline NestByValue(const ExpressionType& matrix) : m_expression(matrix) {}
47
48 EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR inline Index rows() const EIGEN_NOEXCEPT { return m_expression.rows(); }
49 EIGEN_DEVICE_FUNC EIGEN_CONSTEXPR inline Index cols() const EIGEN_NOEXCEPT { return m_expression.cols(); }
50
51 EIGEN_DEVICE_FUNC operator const ExpressionType&() const { return m_expression; }
52
53 EIGEN_DEVICE_FUNC const ExpressionType& nestedExpression() const { return m_expression; }
54
55 protected:
56 const ExpressionType m_expression;
57};
58
61template<typename Derived>
62EIGEN_DEVICE_FUNC inline const NestByValue<Derived>
64{
65 return NestByValue<Derived>(derived());
66}
67
68namespace internal {
69
70// Evaluator of Solve -> eval into a temporary
71template<typename ArgType>
72struct evaluator<NestByValue<ArgType> >
73 : public evaluator<ArgType>
74{
75 typedef evaluator<ArgType> Base;
76
77 EIGEN_DEVICE_FUNC explicit evaluator(const NestByValue<ArgType>& xpr)
78 : Base(xpr.nestedExpression())
79 {}
80};
81}
82
83} // end namespace Eigen
84
85#endif // EIGEN_NESTBYVALUE_H
Base class for all dense matrices, vectors, and arrays.
Definition: DenseBase.h:47
Expression which must be nested by value.
Definition: NestByValue.h:40
Namespace containing all symbols from the Eigen library.
Definition: Core:141
EIGEN_DEFAULT_DENSE_INDEX_TYPE Index
The Index type as used for the API.
Definition: Meta.h:74