Eigen  3.3.7
Inverse.h
1 // This file is part of Eigen, a lightweight C++ template library
2 // for linear algebra.
3 //
4 // Copyright (C) 2014 Gael Guennebaud <gael.guennebaud@inria.fr>
5 //
6 // This Source Code Form is subject to the terms of the Mozilla
7 // Public License v. 2.0. If a copy of the MPL was not distributed
8 // with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
9 
10 #ifndef EIGEN_INVERSE_H
11 #define EIGEN_INVERSE_H
12 
13 namespace Eigen {
14 
15 template<typename XprType,typename StorageKind> class InverseImpl;
16 
17 namespace internal {
18 
19 template<typename XprType>
20 struct traits<Inverse<XprType> >
21  : traits<typename XprType::PlainObject>
22 {
23  typedef typename XprType::PlainObject PlainObject;
24  typedef traits<PlainObject> BaseTraits;
25  enum {
26  Flags = BaseTraits::Flags & RowMajorBit
27  };
28 };
29 
30 } // end namespace internal
31 
42 template<typename XprType>
43 class Inverse : public InverseImpl<XprType,typename internal::traits<XprType>::StorageKind>
44 {
45 public:
46  typedef typename XprType::StorageIndex StorageIndex;
47  typedef typename XprType::PlainObject PlainObject;
48  typedef typename XprType::Scalar Scalar;
49  typedef typename internal::ref_selector<XprType>::type XprTypeNested;
50  typedef typename internal::remove_all<XprTypeNested>::type XprTypeNestedCleaned;
51  typedef typename internal::ref_selector<Inverse>::type Nested;
52  typedef typename internal::remove_all<XprType>::type NestedExpression;
53 
54  explicit EIGEN_DEVICE_FUNC Inverse(const XprType &xpr)
55  : m_xpr(xpr)
56  {}
57 
58  EIGEN_DEVICE_FUNC Index rows() const { return m_xpr.rows(); }
59  EIGEN_DEVICE_FUNC Index cols() const { return m_xpr.cols(); }
60 
61  EIGEN_DEVICE_FUNC const XprTypeNestedCleaned& nestedExpression() const { return m_xpr; }
62 
63 protected:
64  XprTypeNested m_xpr;
65 };
66 
67 // Generic API dispatcher
68 template<typename XprType, typename StorageKind>
69 class InverseImpl
70  : public internal::generic_xpr_base<Inverse<XprType> >::type
71 {
72 public:
73  typedef typename internal::generic_xpr_base<Inverse<XprType> >::type Base;
74  typedef typename XprType::Scalar Scalar;
75 private:
76 
77  Scalar coeff(Index row, Index col) const;
78  Scalar coeff(Index i) const;
79 };
80 
81 namespace internal {
82 
93 template<typename ArgType>
94 struct unary_evaluator<Inverse<ArgType> >
95  : public evaluator<typename Inverse<ArgType>::PlainObject>
96 {
97  typedef Inverse<ArgType> InverseType;
98  typedef typename InverseType::PlainObject PlainObject;
99  typedef evaluator<PlainObject> Base;
100 
101  enum { Flags = Base::Flags | EvalBeforeNestingBit };
102 
103  unary_evaluator(const InverseType& inv_xpr)
104  : m_result(inv_xpr.rows(), inv_xpr.cols())
105  {
106  ::new (static_cast<Base*>(this)) Base(m_result);
107  internal::call_assignment_no_alias(m_result, inv_xpr);
108  }
109 
110 protected:
111  PlainObject m_result;
112 };
113 
114 } // end namespace internal
115 
116 } // end namespace Eigen
117 
118 #endif // EIGEN_INVERSE_H
Namespace containing all symbols from the Eigen library.
Definition: Core:306
const unsigned int RowMajorBit
Definition: Constants.h:61
Expression of the inverse of another expression.
Definition: Inverse.h:43
EIGEN_DEFAULT_DENSE_INDEX_TYPE Index
The Index type as used for the API.
Definition: Meta.h:33
Definition: Eigen_Colamd.h:50
const unsigned int EvalBeforeNestingBit
Definition: Constants.h:65