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#ifndef __RCPP_PARALLEL_RMATRIX__
#define __RCPP_PARALLEL_RMATRIX__
#include <cstddef>
#include <iterator>
namespace RcppParallel {
template <typename T>
class RMatrix {
public:
class Row {
public:
template <typename V>
class row_iterator {
public:
using iterator_category = std::random_access_iterator_tag;
using value_type = V;
using difference_type = std::size_t;
using pointer = value_type*;
using reference = value_type&;
inline row_iterator(Row& row, difference_type i)
: start_(row.start_), parentNrow_(row.parent_.nrow()), index_(i)
{
}
inline row_iterator(pointer start, difference_type parentNrow, difference_type index)
: start_(start), parentNrow_(parentNrow), index_(index)
{
}
inline row_iterator(const row_iterator& other)
: start_(other.start_),
parentNrow_(other.parentNrow_),
index_(other.index_)
{
}
inline row_iterator& operator++() {
index_++;
return *this;
}
inline row_iterator operator++(int) {
row_iterator tmp(*this);
operator++();
return tmp;
}
inline row_iterator& operator--() {
index_-- ;
return *this ;
}
inline row_iterator operator--(int) {
row_iterator tmp(*this);
index_-- ;
return tmp ;
}
row_iterator operator+(difference_type n) const {
return row_iterator(start_, parentNrow_ ,index_ + n ) ;
}
row_iterator operator-(difference_type n) const {
return row_iterator(start_, parentNrow_, index_ - n ) ;
}
difference_type operator+(const row_iterator& other) const {
return index_ + other.index_;
}
difference_type operator-(const row_iterator& other) const {
return index_ - other.index_ ;
}
row_iterator& operator+=(difference_type n) { index_ += n ; return *this; }
row_iterator& operator-=(difference_type n) { index_ -= n ; return *this; }
bool operator==(const row_iterator& other) const { return index_ == other.index_; }
bool operator!=(const row_iterator& other) const { return index_ != other.index_; }
bool operator<(const row_iterator& other) const { return index_ < other.index_; }
bool operator>(const row_iterator& other) const { return index_ > other.index_; }
bool operator<=(const row_iterator& other) const { return index_ <= other.index_; }
bool operator>=(const row_iterator& other) const { return index_ >= other.index_; }
inline reference operator*() { return start_[index_ * parentNrow_]; }
inline pointer operator->() { return &(start_[index_ * parentNrow_]); }
inline reference operator[](int i) { return start_[(index_+i) * parentNrow_]; }
private:
pointer start_;
difference_type parentNrow_;
difference_type index_;
};
typedef row_iterator<T> iterator;
typedef row_iterator<const T> const_iterator;
inline Row(RMatrix& parent, std::size_t i)
: parent_(parent),
start_(parent.begin() + i)
{
}
inline Row(const Row& other)
: parent_(other.parent_),
start_(other.start_)
{
}
inline iterator begin() {
return iterator(*this, 0);
}
inline iterator end() {
return iterator(*this, parent_.ncol());
}
inline const_iterator begin() const {
return const_iterator(*this, 0);
}
inline const_iterator end() const {
return const_iterator(*this, parent_.ncol());
}
inline size_t length() const {
return parent_.ncol();
}
inline size_t size() const {
return parent_.ncol();
}
inline T& operator[](std::size_t i) {
return start_[i * parent_.nrow()];
}
inline const T& operator[](std::size_t i) const {
return start_[i * parent_.nrow()];
}
private:
RMatrix& parent_;
T* start_;
};
class Column {
public:
typedef T* iterator;
typedef const T* const_iterator;
inline Column(RMatrix& parent, std::size_t i)
: begin_(parent.begin() + (i * parent.nrow())),
end_(begin_ + parent.nrow())
{
}
inline Column(const Column& other)
: begin_(other.begin_), end_(other.end_)
{
}
inline Column& operator=(const Column& rhs) {
begin_ = rhs.begin_;
end_ = rhs.end_;
return *this;
}
inline iterator begin() { return begin_; }
inline iterator end() { return end_; }
inline const_iterator begin() const { return begin_; }
inline const_iterator end() const { return end_; }
inline size_t length() const { return end_ - begin_; }
inline size_t size() const { return end_ - begin_; }
inline T& operator[](std::size_t i) {
return *(begin_ + i);
}
inline const T& operator[](std::size_t i) const {
return *(begin_ + i);
}
private:
T* begin_;
T* end_;
};
typedef T* iterator;
typedef const T* const_iterator;
template <typename Source>
inline explicit RMatrix(const Source& source)
: data_(const_cast<Source&>(source).begin()),
nrow_(source.nrow()),
ncol_(source.ncol())
{
}
inline RMatrix(T* data, std::size_t nrow, std::size_t ncol)
: data_(data), nrow_(nrow), ncol_(ncol)
{
}
inline iterator begin() { return data_; }
inline iterator end() { return data_ + length(); }
inline const_iterator begin() const { return data_; }
inline const_iterator end() const { return data_ + length(); }
inline std::size_t length() const { return nrow_ * ncol_; }
inline std::size_t nrow() const { return nrow_; }
inline std::size_t ncol() const { return ncol_; }
inline T& operator()(std::size_t i, std::size_t j) {
return *(data_ + (i + j * nrow_));
}
inline const T& operator()(std::size_t i, std::size_t j) const {
return *(data_ + (i + j * nrow_));
}
inline Row row(std::size_t i) {
return Row(*this, i);
}
inline const Row row(std::size_t i) const {
return Row(*const_cast<RMatrix*>(this), i);
}
inline Column column(std::size_t i) {
return Column(*this, i);
}
inline const Column column(std::size_t i) const {
return Column(*const_cast<RMatrix*>(this), i);
}
inline T& operator[](std::size_t i) {
return *(data_ + i);
}
inline const T& operator[](std::size_t i) const {
return *(data_ + i);
}
private:
T* data_;
std::size_t nrow_;
std::size_t ncol_;
};
} // namespace RcppParallel
#endif // __RCPP_PARALLEL_RMATRIX__
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