SOArrayPolicy

SOArrayPolicy

#include <layout.hh>

struct SOArrayPolicy

Defined in src/lib/ncarray/layout.hh:667

Inherits: LayoutPolicy< SOArrayPolicy >

The SOArrayPolicy implements PEP3118 compliance with the addition of a suboffsets field.

List of all members

Name	Kind	Owner
SOArrayPolicy	function	Declared here
SOArrayPolicy	function	Declared here
SOArrayPolicy	function	Declared here
advance	function	Declared here
advance	function	Declared here
advance	function	Declared here
advance	function	Declared here
suboffsets	function	Declared here
suboffset	function	Declared here
is_pointer_impl	function	Declared here
get_offset_impl	function	Declared here
layout_repr	function	Declared here
is_contiguous_impl	function	Declared here
m_suboffsets	variable	Declared here
is_pointer_axis	function	Inherited from LayoutPolicy
is_contiguous_impl	function	Inherited from LayoutPolicy
advance	function	Inherited from LayoutPolicy
advance	function	Inherited from LayoutPolicy
advance	function	Inherited from LayoutPolicy
advance	function	Inherited from LayoutPolicy
shape	function	Inherited from LayoutPolicy
shape	function	Inherited from LayoutPolicy
ndim	function	Inherited from LayoutPolicy
size	function	Inherited from LayoutPolicy
strides	function	Inherited from LayoutPolicy
stride	function	Inherited from LayoutPolicy
layout_repr	function	Inherited from LayoutPolicy
build_new_axes	function	Inherited from LayoutPolicy
get_offset	function	Inherited from LayoutPolicy
layout_matches	function	Inherited from LayoutPolicy
m_shape	variable	Inherited from LayoutPolicy
m_strides	variable	Inherited from LayoutPolicy
m_pointer_axis	variable	Inherited from LayoutPolicy

Inherited from LayoutPolicy

Kind	Name	Description
function	is_pointer_axis const inline	Helper function to determine whether a given axis contains pointers. If true, this axis is a “double pointer” or involves suboffsets, etc. depending on the specialization.
function	is_contiguous_impl const inline	Check if any pointer axes exist.
function	advance const inline	The advance function takes a pointer to the current position in the array as well as an axis and index. Using this information, and the knowledge of the array layout it will move the pointer forward one data unit, accounting for strides, offsets, pointer jumps and so on.
function	advance const inline	The advance function takes a pointer to the current position in the array as well as an axis and index. Using this information, and the knowledge of the array layout it will move the pointer forward one data unit, accounting for strides, offsets, pointer jumps and so on.
function	advance const inline	The advance function overload takes a pointer to the current position in the array as well as a Coords (StaticCoords) object. The coords object provides multiple indices for multiple axes to traverse at once.
function	advance const inline	The advance function overload takes a pointer to the current position in the array as well as a Coords (StaticCoords) object. The coords object provides multiple indices for multiple axes to traverse at once.
function	shape const inline	The pointer to the underlying shape metadata.
function	shape const inline	The shape of a given axis of an array.
function	ndim const inline	The total number of dimensions.
function	size const inline	The total number of elements in the array.
function	strides const inline	The pointer to the underlying strides metadata.
function	stride const inline	The strides along a given axis of an array.
function	layout_repr const inline	The repr functions return a string to identify the layout policy when writing out string representations of the array.
function	build_new_axes const inline	Provided a set of indexing arguments construct the description of the new axes given the layout specification.
function	get_offset const inline	The offset/suboffset along a given axis of an array.
function	layout_matches const inline	Check whether another array’s layout matches my own.
variable	m_shape
variable	m_strides
variable	m_pointer_axis

Public Methods

Return	Name	Description
NCA_HD	SOArrayPolicy inline	The Metadata struct defaults values to 0 - this works for NCArray. For suboffsets based classes, we want the value to be -1. Flipping the suboffset back on requires explicitly setting it.
	SOArrayPolicy	Defaulted constructor.
	SOArrayPolicy noexcept	Defaulted constructor.
NCA_HD void *	advance const inline	The advance function takes a pointer to the current position in the array as well as an axis and index. Using this information, and the knowledge of the array layout it will move the pointer forward one data unit, accounting for strides, offsets, pointer jumps and so on.
NCA_HD const void *	advance const inline	The advance function takes a pointer to the current position in the array as well as an axis and index. Using this information, and the knowledge of the array layout it will move the pointer forward one data unit, accounting for strides, offsets, pointer jumps and so on.
NCA_HD void *	advance const inline	The advance function overload takes a pointer to the current position in the array as well as a Coords (StaticCoords) object. The coords object provides multiple indices for multiple axes to traverse at once.
NCA_HD const void *	advance const inline	The advance function overload takes a pointer to the current position in the array as well as a Coords (StaticCoords) object. The coords object provides multiple indices for multiple axes to traverse at once.
NCA_HD const ssize_t *	suboffsets const inline	The pointer to the underlying suboffsets metadata.
NCA_HD ssize_t	suboffset const inline	The suboffset of a given axis of an array.
NCA_HD bool	is_pointer_impl const inline	Returns whether a given axis is a pointer axis.
NCA_HDMetadata::value_type	get_offset_impl const inline	The offset getter called by the generic version of the base class.
NCA_HD const char *	layout_repr const inline	Returns the string representation of this Layout policy.
NCA_HD bool	is_contiguous_impl const inline	Determines whether the layout is contiguous by checking for pointer axes.

---

SOArrayPolicy

inline

inline NCA_HD SOArrayPolicy()

Defined in src/lib/ncarray/layout.hh:674

The Metadata struct defaults values to 0 - this works for NCArray. For suboffsets based classes, we want the value to be -1. Flipping the suboffset back on requires explicitly setting it.

---

SOArrayPolicy

SOArrayPolicy(const SOArrayPolicy & other) = default

Defined in src/lib/ncarray/layout.hh:680

Defaulted constructor.

---

SOArrayPolicy

noexcept

SOArrayPolicy(SOArrayPolicy && other) noexcept = default

Defined in src/lib/ncarray/layout.hh:681

Defaulted constructor.

---

advance

const inline

inline NCA_HD void * advance(void * data, ssize_t axis, ssize_t index) const

Defined in src/lib/ncarray/layout.hh:701

The advance function takes a pointer to the current position in the array as well as an axis and index. Using this information, and the knowledge of the array layout it will move the pointer forward one data unit, accounting for strides, offsets, pointer jumps and so on.

Via the revised buffer protocol specification in PEP3118, a “suboffset” greater than or equal to 0 indicates that the value on that axis is a pointer. The specific value dictates how many bytes to add to it AFTER dereferencing. Negative suboffsets mean no-pointer axis, and no special dereferencing

Parameters

• data The pointer to the current position in the array.

• axis The current axis being traversed.

• index The current index along the traversed axis.

Returns

The pointer to the next item in the array.

---

advance

const inline

inline NCA_HD const void * advance(const void * data, ssize_t axis, ssize_t index) const

Defined in src/lib/ncarray/layout.hh:726

The advance function takes a pointer to the current position in the array as well as an axis and index. Using this information, and the knowledge of the array layout it will move the pointer forward one data unit, accounting for strides, offsets, pointer jumps and so on.

Via the revised buffer protocol specification in PEP3118, a “suboffset” greater than or equal to 0 indicates that the value on that axis is a pointer. The specific value dictates how many bytes to add to it AFTER dereferencing. Negative suboffsets mean no-pointer axis, and no special dereferencing

Parameters

• data The pointer to the current position in the array.

• axis The current axis being traversed.

• index The current index along the traversed axis.

Returns

The const pointer to the next item in the array.

---

advance

const inline

template<typename Coords> inline NCA_HD void * advance(void * data, const Coords & coords) const

Defined in src/lib/ncarray/layout.hh:754

The advance function overload takes a pointer to the current position in the array as well as a Coords (StaticCoords) object. The coords object provides multiple indices for multiple axes to traverse at once.

Via the revised buffer protocol specification in PEP3118, a “suboffset” greater than or equal to 0 indicates that the value on that axis is a pointer. The specific value dictates how many bytes to add to it AFTER dereferencing. Negative suboffsets mean no-pointer axis, and no special dereferencing

Parameters

• data The pointer to the current position in the array.

• coords The coordinates specifying the indices of all axes to traverse.

Returns

The pointer to the specified item in the array.

---

advance

const inline

template<typename Coords> inline NCA_HD const void * advance(const void * data, const Coords & coords) const

Defined in src/lib/ncarray/layout.hh:785

The advance function overload takes a pointer to the current position in the array as well as a Coords (StaticCoords) object. The coords object provides multiple indices for multiple axes to traverse at once.

Via the revised buffer protocol specification in PEP3118, a “suboffset” greater than or equal to 0 indicates that the value on that axis is a pointer. The specific value dictates how many bytes to add to it AFTER dereferencing. Negative suboffsets mean no-pointer axis, and no special dereferencing

Parameters

• data The pointer to the current position in the array.

• coords The coordinates specifying the indices of all axes to traverse.

Returns

The pointer to the specified item in the array.

---

suboffsets

const inline

inline NCA_HD const ssize_t * suboffsets() const

Defined in src/lib/ncarray/layout.hh:809

The pointer to the underlying suboffsets metadata.

Returns

The pointer to the underlying suboffsets metadata.

---

suboffset

const inline

inline NCA_HD ssize_t suboffset(ssize_t dim) const

Defined in src/lib/ncarray/layout.hh:819

The suboffset of a given axis of an array.

Parameters

• dim A dimension to check the shape of.

Returns

The suboffset of that dimension.

---

is_pointer_impl

const inline

inline NCA_HD bool is_pointer_impl(ssize_t axis) const

Defined in src/lib/ncarray/layout.hh:831

Returns whether a given axis is a pointer axis.

Note

For SOArrayPolicy this checks the value of the suboffset of the axis.

Parameters

• The axis to check if its a pointer axis.

Returns

Whether that axis is a pointer axis.

---

get_offset_impl

const inline

inline NCA_HDMetadata::value_type get_offset_impl(ssize_t axis) const

Defined in src/lib/ncarray/layout.hh:841

The offset getter called by the generic version of the base class.

Parameters

• axis The axis to return the offset for.

Returns

The offset of that axis.

---

layout_repr

const inline

inline NCA_HD const char * layout_repr() const

Defined in src/lib/ncarray/layout.hh:850

Returns the string representation of this Layout policy.

Returns

the string representation of this Layout policy.

---

is_contiguous_impl

const inline

inline NCA_HD bool is_contiguous_impl() const

Defined in src/lib/ncarray/layout.hh:861

Determines whether the layout is contiguous by checking for pointer axes.

Note

This does NOT check for gaps due to strides. Only that there are no pointer axes. This is intended to be incorporated into a broader contiguity checking routine.

Returns

Whether there are no pointer axes.

Protected Attributes

Return	Name	Description
Metadata	m_suboffsets

---

m_suboffsets

Metadata m_suboffsets

Defined in src/lib/ncarray/layout.hh:871