1// This file is part of Eigen, a lightweight C++ template library
2// for linear algebra.
3//
4// Copyright (C) 2008-2015 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_SPARSE_CWISE_UNARY_OP_H
11#define EIGEN_SPARSE_CWISE_UNARY_OP_H
12
13namespace Eigen {
14
15namespace internal {
16
17template<typename UnaryOp, typename ArgType>
18struct unary_evaluator<CwiseUnaryOp<UnaryOp,ArgType>, IteratorBased>
19 : public evaluator_base<CwiseUnaryOp<UnaryOp,ArgType> >
20{
21 public:
22 typedef CwiseUnaryOp<UnaryOp, ArgType> XprType;
23
24 class InnerIterator;
25
26 enum {
27 CoeffReadCost = evaluator<ArgType>::CoeffReadCost + functor_traits<UnaryOp>::Cost,
28 Flags = XprType::Flags
29 };
30
31 explicit unary_evaluator(const XprType& op) : m_functor(op.functor()), m_argImpl(op.nestedExpression())
32 {
33 EIGEN_INTERNAL_CHECK_COST_VALUE(functor_traits<UnaryOp>::Cost);
34 EIGEN_INTERNAL_CHECK_COST_VALUE(CoeffReadCost);
35 }
36
37 inline Index nonZerosEstimate() const {
38 return m_argImpl.nonZerosEstimate();
39 }
40
41 protected:
42 typedef typename evaluator<ArgType>::InnerIterator EvalIterator;
43
44 const UnaryOp m_functor;
45 evaluator<ArgType> m_argImpl;
46};
47
48template<typename UnaryOp, typename ArgType>
49class unary_evaluator<CwiseUnaryOp<UnaryOp,ArgType>, IteratorBased>::InnerIterator
50 : public unary_evaluator<CwiseUnaryOp<UnaryOp,ArgType>, IteratorBased>::EvalIterator
51{
52 typedef typename XprType::Scalar Scalar;
53 typedef typename unary_evaluator<CwiseUnaryOp<UnaryOp,ArgType>, IteratorBased>::EvalIterator Base;
54 public:
55
56 EIGEN_STRONG_INLINE InnerIterator(const unary_evaluator& unaryOp, Index outer)
57 : Base(unaryOp.m_argImpl,outer), m_functor(unaryOp.m_functor)
58 {}
59
60 EIGEN_STRONG_INLINE InnerIterator& operator++()
61 { Base::operator++(); return *this; }
62
63 EIGEN_STRONG_INLINE Scalar value() const { return m_functor(Base::value()); }
64
65 protected:
66 const UnaryOp m_functor;
67 private:
68 Scalar& valueRef();
69};
70
71template<typename ViewOp, typename ArgType>
72struct unary_evaluator<CwiseUnaryView<ViewOp,ArgType>, IteratorBased>
73 : public evaluator_base<CwiseUnaryView<ViewOp,ArgType> >
74{
75 public:
76 typedef CwiseUnaryView<ViewOp, ArgType> XprType;
77
78 class InnerIterator;
79
80 enum {
81 CoeffReadCost = evaluator<ArgType>::CoeffReadCost + functor_traits<ViewOp>::Cost,
82 Flags = XprType::Flags
83 };
84
85 explicit unary_evaluator(const XprType& op) : m_functor(op.functor()), m_argImpl(op.nestedExpression())
86 {
87 EIGEN_INTERNAL_CHECK_COST_VALUE(functor_traits<ViewOp>::Cost);
88 EIGEN_INTERNAL_CHECK_COST_VALUE(CoeffReadCost);
89 }
90
91 protected:
92 typedef typename evaluator<ArgType>::InnerIterator EvalIterator;
93
94 const ViewOp m_functor;
95 evaluator<ArgType> m_argImpl;
96};
97
98template<typename ViewOp, typename ArgType>
99class unary_evaluator<CwiseUnaryView<ViewOp,ArgType>, IteratorBased>::InnerIterator
100 : public unary_evaluator<CwiseUnaryView<ViewOp,ArgType>, IteratorBased>::EvalIterator
101{
102 typedef typename XprType::Scalar Scalar;
103 typedef typename unary_evaluator<CwiseUnaryView<ViewOp,ArgType>, IteratorBased>::EvalIterator Base;
104 public:
105
106 EIGEN_STRONG_INLINE InnerIterator(const unary_evaluator& unaryOp, Index outer)
107 : Base(unaryOp.m_argImpl,outer), m_functor(unaryOp.m_functor)
108 {}
109
110 EIGEN_STRONG_INLINE InnerIterator& operator++()
111 { Base::operator++(); return *this; }
112
113 EIGEN_STRONG_INLINE Scalar value() const { return m_functor(Base::value()); }
114 EIGEN_STRONG_INLINE Scalar& valueRef() { return m_functor(Base::valueRef()); }
115
116 protected:
117 const ViewOp m_functor;
118};
119
120} // end namespace internal
121
122template<typename Derived>
123EIGEN_STRONG_INLINE Derived&
124SparseMatrixBase<Derived>::operator*=(const Scalar& other)
125{
126 typedef typename internal::evaluator<Derived>::InnerIterator EvalIterator;
127 internal::evaluator<Derived> thisEval(derived());
128 for (Index j=0; j<outerSize(); ++j)
129 for (EvalIterator i(thisEval,j); i; ++i)
130 i.valueRef() *= other;
131 return derived();
132}
133
134template<typename Derived>
135EIGEN_STRONG_INLINE Derived&
136SparseMatrixBase<Derived>::operator/=(const Scalar& other)
137{
138 typedef typename internal::evaluator<Derived>::InnerIterator EvalIterator;
139 internal::evaluator<Derived> thisEval(derived());
140 for (Index j=0; j<outerSize(); ++j)
141 for (EvalIterator i(thisEval,j); i; ++i)
142 i.valueRef() /= other;
143 return derived();
144}
145
146} // end namespace Eigen
147
148#endif // EIGEN_SPARSE_CWISE_UNARY_OP_H
149