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// This file is part of Eigen, a lightweight C++ template library
// for linear algebra.
//
// Copyright (C) 2018 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/.
namespace Eigen {
template<typename XprType,typename Derived>
class DenseStlIteratorBase
{
public:
typedef Index difference_type;
typedef std::random_access_iterator_tag iterator_category;
DenseStlIteratorBase() : mp_xpr(0), m_index(0) {}
DenseStlIteratorBase(XprType& xpr, Index index) : mp_xpr(&xpr), m_index(index) {}
void swap(DenseStlIteratorBase& other) {
std::swap(mp_xpr,other.mp_xpr);
std::swap(m_index,other.m_index);
}
Derived& operator++() { ++m_index; return derived(); }
Derived& operator--() { --m_index; return derived(); }
Derived operator++(int) { Derived prev(derived()); operator++(); return prev;}
Derived operator--(int) { Derived prev(derived()); operator--(); return prev;}
friend Derived operator+(const DenseStlIteratorBase& a, Index b) { Derived ret(a.derived()); ret += b; return ret; }
friend Derived operator-(const DenseStlIteratorBase& a, Index b) { Derived ret(a.derived()); ret -= b; return ret; }
friend Derived operator+(Index a, const DenseStlIteratorBase& b) { Derived ret(b.derived()); ret += a; return ret; }
friend Derived operator-(Index a, const DenseStlIteratorBase& b) { Derived ret(b.derived()); ret -= a; return ret; }
Derived& operator+=(Index b) { m_index += b; return derived(); }
Derived& operator-=(Index b) { m_index -= b; return derived(); }
difference_type operator-(const DenseStlIteratorBase& other) const { eigen_assert(mp_xpr == other.mp_xpr);return m_index - other.m_index; }
bool operator==(const DenseStlIteratorBase& other) { eigen_assert(mp_xpr == other.mp_xpr); return m_index == other.m_index; }
bool operator!=(const DenseStlIteratorBase& other) { eigen_assert(mp_xpr == other.mp_xpr); return m_index != other.m_index; }
bool operator< (const DenseStlIteratorBase& other) { eigen_assert(mp_xpr == other.mp_xpr); return m_index < other.m_index; }
bool operator<=(const DenseStlIteratorBase& other) { eigen_assert(mp_xpr == other.mp_xpr); return m_index <= other.m_index; }
bool operator> (const DenseStlIteratorBase& other) { eigen_assert(mp_xpr == other.mp_xpr); return m_index > other.m_index; }
bool operator>=(const DenseStlIteratorBase& other) { eigen_assert(mp_xpr == other.mp_xpr); return m_index >= other.m_index; }
protected:
Derived& derived() { return static_cast<Derived&>(*this); }
const Derived& derived() const { return static_cast<const Derived&>(*this); }
XprType *mp_xpr;
Index m_index;
};
template<typename XprType>
class DenseStlIterator : public DenseStlIteratorBase<XprType, DenseStlIterator<XprType> >
{
public:
typedef typename XprType::Scalar value_type;
protected:
enum {
has_direct_access = (internal::traits<XprType>::Flags & DirectAccessBit) ? 1 : 0,
has_write_access = internal::is_lvalue<XprType>::value
};
typedef DenseStlIteratorBase<XprType,DenseStlIterator> Base;
using Base::m_index;
using Base::mp_xpr;
typedef typename internal::conditional<bool(has_direct_access), const value_type&, const value_type>::type read_only_ref_t;
public:
typedef typename internal::conditional<bool(has_write_access), value_type *, const value_type *>::type pointer;
typedef typename internal::conditional<bool(has_write_access), value_type&, read_only_ref_t>::type reference;
DenseStlIterator() : Base() {}
DenseStlIterator(XprType& xpr, Index index) : Base(xpr,index) {}
reference operator*() const { return (*mp_xpr)(m_index); }
reference operator[](Index i) const { return (*mp_xpr)(m_index+i); }
pointer operator->() const { return &((*mp_xpr)(m_index)); }
};
template<typename XprType,typename Derived>
void swap(DenseStlIteratorBase<XprType,Derived>& a, DenseStlIteratorBase<XprType,Derived>& b) {
a.swap(b);
}
template<typename Derived>
inline DenseStlIterator<Derived> DenseBase<Derived>::begin()
{
EIGEN_STATIC_ASSERT_VECTOR_ONLY(Derived);
return DenseStlIterator<Derived>(derived(), 0);
}
template<typename Derived>
inline DenseStlIterator<const Derived> DenseBase<Derived>::begin() const
{
return cbegin();
}
template<typename Derived>
inline DenseStlIterator<const Derived> DenseBase<Derived>::cbegin() const
{
EIGEN_STATIC_ASSERT_VECTOR_ONLY(Derived);
return DenseStlIterator<const Derived>(derived(), 0);
}
template<typename Derived>
inline DenseStlIterator<Derived> DenseBase<Derived>::end()
{
EIGEN_STATIC_ASSERT_VECTOR_ONLY(Derived);
return DenseStlIterator<Derived>(derived(), size());
}
template<typename Derived>
inline DenseStlIterator<const Derived> DenseBase<Derived>::end() const
{
return cend();
}
template<typename Derived>
inline DenseStlIterator<const Derived> DenseBase<Derived>::cend() const
{
EIGEN_STATIC_ASSERT_VECTOR_ONLY(Derived);
return DenseStlIterator<const Derived>(derived(), size());
}
template<typename XprType>
class DenseColStlIterator : public DenseStlIteratorBase<XprType, DenseColStlIterator<XprType> >
{
protected:
enum { is_lvalue = internal::is_lvalue<XprType>::value };
typedef DenseStlIteratorBase<XprType,DenseColStlIterator> Base;
using Base::m_index;
using Base::mp_xpr;
public:
typedef typename internal::conditional<bool(is_lvalue), typename XprType::ColXpr, typename XprType::ConstColXpr>::type value_type;
typedef value_type* pointer;
typedef value_type reference;
DenseColStlIterator() : Base() {}
DenseColStlIterator(XprType& xpr, Index index) : Base(xpr,index) {}
reference operator*() const { return (*mp_xpr).col(m_index); }
reference operator[](Index i) const { return (*mp_xpr).col(m_index+i); }
pointer operator->() const { return &((*mp_xpr).col(m_index)); }
};
template<typename XprType>
class DenseRowStlIterator : public DenseStlIteratorBase<XprType, DenseRowStlIterator<XprType> >
{
protected:
enum { is_lvalue = internal::is_lvalue<XprType>::value };
typedef DenseStlIteratorBase<XprType,DenseRowStlIterator> Base;
using Base::m_index;
using Base::mp_xpr;
public:
typedef typename internal::conditional<bool(is_lvalue), typename XprType::RowXpr, typename XprType::ConstRowXpr>::type value_type;
typedef value_type* pointer;
typedef value_type reference;
DenseRowStlIterator() : Base() {}
DenseRowStlIterator(XprType& xpr, Index index) : Base(xpr,index) {}
reference operator*() const { return (*mp_xpr).row(m_index); }
reference operator[](Index i) const { return (*mp_xpr).row(m_index+i); }
pointer operator->() const { return &((*mp_xpr).row(m_index)); }
};
template<typename Xpr>
class ColsProxy
{
public:
ColsProxy(Xpr& xpr) : m_xpr(xpr) {}
DenseColStlIterator<Xpr> begin() const { return DenseColStlIterator<Xpr>(m_xpr, 0); }
DenseColStlIterator<const Xpr> cbegin() const { return DenseColStlIterator<const Xpr>(m_xpr, 0); }
DenseColStlIterator<Xpr> end() const { return DenseColStlIterator<Xpr>(m_xpr, m_xpr.cols()); }
DenseColStlIterator<const Xpr> cend() const { return DenseColStlIterator<const Xpr>(m_xpr, m_xpr.cols()); }
protected:
Xpr& m_xpr;
};
template<typename Xpr>
class RowsProxy
{
public:
RowsProxy(Xpr& xpr) : m_xpr(xpr) {}
DenseRowStlIterator<Xpr> begin() const { return DenseRowStlIterator<Xpr>(m_xpr, 0); }
DenseRowStlIterator<const Xpr> cbegin() const { return DenseRowStlIterator<const Xpr>(m_xpr, 0); }
DenseRowStlIterator<Xpr> end() const { return DenseRowStlIterator<Xpr>(m_xpr, m_xpr.rows()); }
DenseRowStlIterator<const Xpr> cend() const { return DenseRowStlIterator<const Xpr>(m_xpr, m_xpr.rows()); }
protected:
Xpr& m_xpr;
};
template<typename Derived>
ColsProxy<Derived> DenseBase<Derived>::allCols()
{ return ColsProxy<Derived>(derived()); }
template<typename Derived>
ColsProxy<const Derived> DenseBase<Derived>::allCols() const
{ return ColsProxy<const Derived>(derived()); }
template<typename Derived>
RowsProxy<Derived> DenseBase<Derived>::allRows()
{ return RowsProxy<Derived>(derived()); }
template<typename Derived>
RowsProxy<const Derived> DenseBase<Derived>::allRows() const
{ return RowsProxy<const Derived>(derived()); }
} // namespace Eigen
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