gko::accessor::row_major< ValueType, Dimensionality > Class Template Reference

A row_major accessor is a bridge between a range and the row-major memory layout. More...

#include <ginkgo/core/base/range_accessors.hpp>

Collaboration diagram for gko::accessor::row_major< ValueType, Dimensionality >:

Public Types
using	value_type = ValueType
	Type of values returned by the accessor.
using	data_type = value_type*
	Type of underlying data storage.

Public Member Functions
constexpr value_type &	operator() (size_type row, size_type col) const
	Returns the data element at position (row, col).
constexpr range< row_major >	operator() (const span &rows, const span &cols) const
	Returns the sub-range spanning the range (rows, cols).
constexpr size_type	length (size_type dimension) const
	Returns the length in dimension dimension.
template<typename OtherAccessor>
void	copy_from (const OtherAccessor &other) const
	Copies data from another accessor.

Public Attributes
const data_type	data
	Reference to the underlying data.
const std::array< const size_type, dimensionality >	lengths
	An array of dimension sizes.
const size_type	stride
	Distance between consecutive rows.

Static Public Attributes
static constexpr size_type	dimensionality = 2
	Number of dimensions of the accessor.

Friends
class	range< row_major >

Detailed Description

template<typename ValueType, size_type Dimensionality>
class gko::accessor::row_major< ValueType, Dimensionality >

A row_major accessor is a bridge between a range and the row-major memory layout.

You should never try to explicitly create an instance of this accessor. Instead, supply it as a template parameter to a range, and pass the constructor parameters for this class to the range (it will forward it to this class).

Warning

The current implementation is incomplete, and only allows for 2-dimensional ranges.

Template Parameters

ValueType	type of values this accessor returns
Dimensionality	number of dimensions of this accessor (has to be 2)

Member Function Documentation

copy_from()

template<typename ValueType, size_type Dimensionality>

template<typename OtherAccessor>

void gko::accessor::row_major< ValueType, Dimensionality >::copy_from ( const OtherAccessor & other ) const

inline

Copies data from another accessor.

Warning

Do not use this function since it is not optimized for a specific executor. It will always be performed sequentially. Please write an optimized version (adjusted to the architecture) by iterating through the values yourself.

Template Parameters

OtherAccessor

type of the other accessor

Parameters

other

other accessor

References lengths.

length()

template<typename ValueType, size_type Dimensionality>

size_type gko::accessor::row_major< ValueType, Dimensionality >::length ( size_type dimension ) const

inlineconstexpr

Returns the length in dimension dimension.

Parameters

dimension

a dimension index

Returns

length in dimension dimension

References lengths.

operator()() [1/2]

template<typename ValueType, size_type Dimensionality>

range< row_major > gko::accessor::row_major< ValueType, Dimensionality >::operator() ( const span & rows, const span & cols ) const

inlineconstexpr

Returns the sub-range spanning the range (rows, cols).

Parameters

rows	row span
cols	column span

Returns

sub-range spanning the range (rows, cols)

References gko::span::begin, data, gko::span::end, gko::span::is_valid(), lengths, and stride.

operator()() [2/2]

template<typename ValueType, size_type Dimensionality>

value_type & gko::accessor::row_major< ValueType, Dimensionality >::operator() ( size_type row, size_type col ) const

inlineconstexpr

Returns the data element at position (row, col).

Parameters

row	row index
col	column index

Returns

data element at (row, col)

References data, lengths, and stride.

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The documentation for this class was generated from the following file:

• ginkgo/core/base/range_accessors.hpp