OpenVDB: AttributeSet Class Reference

OpenVDB 13.0.0

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AttributeSet Class Reference

Ordered collection of uniquely-named attribute arrays. More...

`#include <openvdb/points/AttributeSet.h>`

## Classes
struct | Util
class | Descriptor
| An immutable object that stores name, type and AttributeSet position for a constant collection of attribute arrays. More...

## Public Types
enum | AttributePositionLabel : size_t { INVALID_POS = std::numeric_limits<size_t>::max() }
using | Ptr = std::shared_ptr<AttributeSet>
using | ConstPtr = std::shared_ptr<const AttributeSet>
using | UniquePtr = std::unique_ptr<AttributeSet>
using | DescriptorPtr = std::shared_ptr<Descriptor>
using | DescriptorConstPtr = std::shared_ptr<const Descriptor>

## Public Member Functions
| AttributeSet ()
| AttributeSet (const AttributeSet &attributeSet, Index arrayLength, const AttributeArray::ScopedRegistryLock *lock=nullptr)
| AttributeSet (const DescriptorPtr &descriptor, Index arrayLength=1, const AttributeArray::ScopedRegistryLock *lock=nullptr)
| AttributeSet (const AttributeSet &)
| Shallow copy constructor, the descriptor and attribute arrays will be shared.
AttributeSet & | operator= (const AttributeSet &)=delete
| Disallow copy assignment, since it wouldn't be obvious whether the copy is deep or shallow.
Descriptor & | descriptor ()
| Return a reference to this attribute set's descriptor, which might be shared with other sets.
const Descriptor & | descriptor () const
DescriptorPtr | descriptorPtr () const
| Return a pointer to this attribute set's descriptor, which might be shared with other sets.
size_t | size () const
| Return the number of attributes in this set.
size_t | memUsage () const
| Return the number of bytes of memory used by this attribute set.
size_t | memUsageIfLoaded () const
size_t | find (const std::string &name) const
| Return the position of the attribute array whose name is name, or `INVALID_POS` if no match is found.
size_t | replace (const std::string &name, const AttributeArray::Ptr &)
| Replace the attribute array whose name is name.
size_t | replace (size_t pos, const AttributeArray::Ptr &)
| Replace the attribute array stored at position pos in this container.
const AttributeArray * | getConst (const std::string &name) const
| Return a pointer to the attribute array whose name is name or a null pointer if no match is found.
const AttributeArray * | get (const std::string &name) const
AttributeArray * | get (const std::string &name)
const AttributeArray * | getConst (size_t pos) const
| Return a pointer to the attribute array stored at position pos in this set.
const AttributeArray * | get (size_t pos) const
AttributeArray * | get (size_t pos)
size_t | groupOffset (const Name &groupName) const
| Return the group offset from the name or index of the group A group attribute array is a single byte (8-bit), each bit of which can denote a group. The group offset is the position of the bit that denotes the requested group if all group attribute arrays in the set (and only attribute arrays marked as group) were to be laid out linearly according to their order in the set.
size_t | groupOffset (const Util::GroupIndex &index) const
Util::GroupIndex | groupIndex (const Name &groupName) const
| Return the group index from the name of the group.
Util::GroupIndex | groupIndex (const size_t offset) const
std::vector< size_t > | groupAttributeIndices () const
| Return the indices of the attribute arrays which are group attribute arrays.
bool | isShared (size_t pos) const
| Return true if the attribute array stored at position pos is shared.
void | makeUnique (size_t pos)
| If the attribute array stored at position pos is shared, replace the array with a deep copy of itself that is not shared with anyone else.
AttributeArray::Ptr | appendAttribute (const Name &name, const NamePair &type, const Index strideOrTotalSize=1, const bool constantStride=true, const Metadata *defaultValue=nullptr)
| Append attribute attribute (simple method).
AttributeArray::Ptr | appendAttribute (const Descriptor &expected, DescriptorPtr &replacement, const size_t pos, const Index strideOrTotalSize=1, const bool constantStride=true, const Metadata *defaultValue=nullptr, const AttributeArray::ScopedRegistryLock *lock=nullptr)
AttributeArray::Ptr | removeAttribute (const Name &name)
| Remove and return an attribute array by name.
AttributeArray::Ptr | removeAttribute (const size_t pos)
| Remove and return an attribute array by index.
AttributeArray::Ptr | removeAttributeUnsafe (const size_t pos)
| Remove and return an attribute array by index (unsafe method).
void | dropAttributes (const std::vector< size_t > &pos)
void | dropAttributes (const std::vector< size_t > &pos, const Descriptor &expected, DescriptorPtr &replacement)
void | renameAttributes (const Descriptor &expected, const DescriptorPtr &replacement)
void | reorderAttributes (const DescriptorPtr &replacement)
void | resetDescriptor (const DescriptorPtr &replacement, const bool allowMismatchingDescriptors=false)
void | read (std::istream &)
| Read the entire set from a stream.
void | write (std::ostream &, bool outputTransient=false) const
void | readDescriptor (std::istream &)
| This will read the attribute descriptor from a stream.
void | writeDescriptor (std::ostream &, bool outputTransient=false) const
void | readMetadata (std::istream &)
| This will read the attribute metadata from a stream.
void | writeMetadata (std::ostream &, bool outputTransient=false, bool paged=false) const
void | readAttributes (std::istream &)
| This will read the attribute data from a stream.
void | writeAttributes (std::ostream &, bool outputTransient=false) const
bool | operator== (const AttributeSet &other) const
bool | operator!= (const AttributeSet &other) const

## Detailed Description

Ordered collection of uniquely-named attribute arrays.

## Member Typedef Documentation

## ◆ ConstPtr

using ConstPtr = std::shared_ptr<const AttributeSet>

## ◆ DescriptorConstPtr

using DescriptorConstPtr = std::shared_ptr<const Descriptor>

## ◆ DescriptorPtr

using DescriptorPtr = std::shared_ptr<Descriptor>

## ◆ Ptr

using Ptr = std::shared_ptr<AttributeSet>

## ◆ UniquePtr

using UniquePtr = std::unique_ptr<AttributeSet>

## Member Enumeration Documentation

## ◆ AttributePositionLabel

enum AttributePositionLabel : size_t

Enumerator
INVALID_POS |

## Constructor & Destructor Documentation

## ◆ AttributeSet() [1/4]

AttributeSet | ( |  | ) |

## ◆ AttributeSet() [2/4]

AttributeSet | ( | const AttributeSet & | attributeSet,
|  | Index | arrayLength,
|  | const AttributeArray::ScopedRegistryLock * | lock = nullptr )

Construct a new AttributeSet from the given AttributeSet.

Parameters

  attributeSet | the old attribute set
  arrayLength | the desired length of the arrays in the new AttributeSet
  lock | an optional scoped registry lock to avoid contention

Note
  This constructor is typically used to resize an existing AttributeSet as it transfers attribute metadata such as hidden and transient flags

## ◆ AttributeSet() [3/4]

AttributeSet | ( | const DescriptorPtr & | descriptor,
|  | Index | arrayLength = 1,
|  | const AttributeArray::ScopedRegistryLock * | lock = nullptr )

Construct a new AttributeSet from the given Descriptor.

Parameters

  descriptor | stored in the new AttributeSet and used in construction
  arrayLength | the desired length of the arrays in the new AttributeSet
  lock | an optional scoped registry lock to avoid contention

Note
  Descriptors do not store attribute metadata such as hidden and transient flags which live on the AttributeArrays, so for constructing from an existing AttributeSet use the AttributeSet(const AttributeSet&, Index) constructor instead

## ◆ AttributeSet() [4/4]

AttributeSet | ( | const AttributeSet & |  | ) |

Shallow copy constructor, the descriptor and attribute arrays will be shared.

## Member Function Documentation

## ◆ appendAttribute() [1/2]

AttributeArray::Ptr appendAttribute | ( | const Descriptor & | expected,
|  | DescriptorPtr & | replacement,
|  | const size_t | pos,
|  | const Index | strideOrTotalSize = 1,
|  | const bool | constantStride = true,
|  | const Metadata * | defaultValue = nullptr,
|  | const AttributeArray::ScopedRegistryLock * | lock = nullptr )

Append attribute attribute (descriptor-sharing) Requires current descriptor to match expected On append, current descriptor is replaced with replacement Provide a lock object to avoid contention from appending in parallel

## ◆ appendAttribute() [2/2]

AttributeArray::Ptr appendAttribute | ( | const Name & | name,
|  | const NamePair & | type,
|  | const Index | strideOrTotalSize = 1,
|  | const bool | constantStride = true,
|  | const Metadata * | defaultValue = nullptr )

Append attribute attribute (simple method).

## ◆ descriptor() [1/2]

Descriptor & descriptor | ( |  | ) |
| inline

Return a reference to this attribute set's descriptor, which might be shared with other sets.

## ◆ descriptor() [2/2]

const Descriptor & descriptor | ( |  | ) | const
| inline

## ◆ descriptorPtr()

DescriptorPtr descriptorPtr | ( |  | ) | const
| inline

Return a pointer to this attribute set's descriptor, which might be shared with other sets.

## ◆ dropAttributes() [1/2]

void dropAttributes | ( | const std::vector< size_t > & | pos | ) |

Drop attributes with pos indices (simple method) Creates a new descriptor for this attribute set

## ◆ dropAttributes() [2/2]

void dropAttributes | ( | const std::vector< size_t > & | pos,
|  | const Descriptor & | expected,
|  | DescriptorPtr & | replacement )

Drop attributes with pos indices (descriptor-sharing method) Requires current descriptor to match expected On drop, current descriptor is replaced with replacement

## ◆ find()

size_t find | ( | const std::string & | name | ) | const

Return the position of the attribute array whose name is name, or `INVALID_POS` if no match is found.

## ◆ get() [1/4]

AttributeArray * get | ( | const std::string & | name | ) |

## ◆ get() [2/4]

const AttributeArray * get | ( | const std::string & | name | ) | const

## ◆ get() [3/4]

AttributeArray * get | ( | size_t | pos | ) |

## ◆ get() [4/4]

const AttributeArray * get | ( | size_t | pos | ) | const

## ◆ getConst() [1/2]

const AttributeArray * getConst | ( | const std::string & | name | ) | const

Return a pointer to the attribute array whose name is name or a null pointer if no match is found.

## ◆ getConst() [2/2]

const AttributeArray * getConst | ( | size_t | pos | ) | const

Return a pointer to the attribute array stored at position pos in this set.

## ◆ groupAttributeIndices()

std::vector< size_t > groupAttributeIndices | ( |  | ) | const

Return the indices of the attribute arrays which are group attribute arrays.

## ◆ groupIndex() [1/2]

Util::GroupIndex groupIndex | ( | const Name & | groupName | ) | const

Return the group index from the name of the group.

## ◆ groupIndex() [2/2]

Util::GroupIndex groupIndex | ( | const size_t | offset | ) | const

Return the group index from the offset of the group

Note
  see offset description for groupOffset()

## ◆ groupOffset() [1/2]

size_t groupOffset | ( | const Name & | groupName | ) | const

Return the group offset from the name or index of the group A group attribute array is a single byte (8-bit), each bit of which can denote a group. The group offset is the position of the bit that denotes the requested group if all group attribute arrays in the set (and only attribute arrays marked as group) were to be laid out linearly according to their order in the set.

## ◆ groupOffset() [2/2]

size_t groupOffset | ( | const Util::GroupIndex & | index | ) | const

## ◆ isShared()

bool isShared | ( | size_t | pos | ) | const

Return true if the attribute array stored at position pos is shared.

## ◆ makeUnique()

void makeUnique | ( | size_t | pos | ) |

If the attribute array stored at position pos is shared, replace the array with a deep copy of itself that is not shared with anyone else.

## ◆ memUsage()

size_t memUsage | ( |  | ) | const

Return the number of bytes of memory used by this attribute set.

## ◆ memUsageIfLoaded()

size_t memUsageIfLoaded | ( |  | ) | const

Return the number of bytes of memory used by this attribute set once it has been deserialized (this may be different to memUsage() if delay-loading is in use).

## ◆ operator!=()

bool operator!= | ( | const AttributeSet & | other | ) | const
| inline

## ◆ operator=()

AttributeSet & operator= | ( | const AttributeSet & |  | ) |
| delete

Disallow copy assignment, since it wouldn't be obvious whether the copy is deep or shallow.

## ◆ operator==()

bool operator== | ( | const AttributeSet & | other | ) | const

Compare the descriptors and attribute arrays on the attribute sets Exit early if the descriptors do not match

## ◆ read()

void read | ( | std::istream & |  | ) |

Read the entire set from a stream.

## ◆ readAttributes()

void readAttributes | ( | std::istream & |  | ) |

This will read the attribute data from a stream.

## ◆ readDescriptor()

void readDescriptor | ( | std::istream & |  | ) |

This will read the attribute descriptor from a stream.

## ◆ readMetadata()

void readMetadata | ( | std::istream & |  | ) |

This will read the attribute metadata from a stream.

## ◆ removeAttribute() [1/2]

AttributeArray::Ptr removeAttribute | ( | const Name & | name | ) |

Remove and return an attribute array by name.

Parameters

  name | the name of the attribute array to release

Detaches the attribute array from this attribute set and returns it, if name is invalid, returns an empty shared pointer. This also updates the descriptor to remove the reference to the attribute array.

Note
  AttributeArrays are stored as shared pointers, so they are not guaranteed to be unique. Check the reference count before blindly re-using in a new AttributeSet.

## ◆ removeAttribute() [2/2]

AttributeArray::Ptr removeAttribute | ( | const size_t | pos | ) |

Remove and return an attribute array by index.

Parameters

  pos | the position index of the attribute to release

Detaches the attribute array from this attribute set and returns it, if pos is invalid, returns an empty shared pointer. This also updates the descriptor to remove the reference to the attribute array.

Note
  AttributeArrays are stored as shared pointers, so they are not guaranteed to be unique. Check the reference count before blindly re-using in a new AttributeSet.

## ◆ removeAttributeUnsafe()

AttributeArray::Ptr removeAttributeUnsafe | ( | const size_t | pos | ) |

Remove and return an attribute array by index (unsafe method).

Parameters

  pos | the position index of the attribute to release

Detaches the attribute array from this attribute set and returns it, if pos is invalid, returns an empty shared pointer. In cases where the AttributeSet is due to be destroyed, a small performance advantage can be gained by leaving the attribute array as a nullptr and not updating the descriptor. However, this leaves the AttributeSet in an invalid state making it unsafe to call any methods that implicitly derefence the attribute array.

Note
  AttributeArrays are stored as shared pointers, so they are not guaranteed to be unique. Check the reference count before blindly re-using in a new AttributeSet.

Warning
  Only use this method if you're an expert and know the risks of not updating the array of attributes or the descriptor.

## ◆ renameAttributes()

void renameAttributes | ( | const Descriptor & | expected,
|  | const DescriptorPtr & | replacement )

Re-name attributes in set to match a provided descriptor Replaces own descriptor with replacement

## ◆ reorderAttributes()

void reorderAttributes | ( | const DescriptorPtr & | replacement | ) |

Re order attribute set to match a provided descriptor Replaces own descriptor with replacement

## ◆ replace() [1/2]

size_t replace | ( | const std::string & | name,
|  | const AttributeArray::Ptr & | )

Replace the attribute array whose name is name.

Returns
  The position of the updated attribute array or `INVALID_POS` if the given name does not exist or if the replacement failed because the new array type does not comply with the descriptor.

## ◆ replace() [2/2]

size_t replace | ( | size_t | pos,
|  | const AttributeArray::Ptr & | )

Replace the attribute array stored at position pos in this container.

Returns
  The position of the updated attribute array or `INVALID_POS` if replacement failed because the new array type does not comply with the descriptor.

## ◆ resetDescriptor()

void resetDescriptor | ( | const DescriptorPtr & | replacement,
|  | const bool | allowMismatchingDescriptors = false )

Replace the current descriptor with a replacement Note the provided Descriptor must be identical to the replacement unless allowMismatchingDescriptors is true (default is false)

## ◆ size()

size_t size | ( |  | ) | const
| inline

Return the number of attributes in this set.

## ◆ write()

void write | ( | std::ostream & | ,
|  | bool | outputTransient = false ) const

Write the entire set to a stream.

Parameters

  outputTransient | if true, write out transient attributes

## ◆ writeAttributes()

void writeAttributes | ( | std::ostream & | ,
|  | bool | outputTransient = false ) const

This will write the attribute data to a stream.

Parameters

  outputTransient | if true, write out transient attributes

## ◆ writeDescriptor()

void writeDescriptor | ( | std::ostream & | ,
|  | bool | outputTransient = false ) const

This will write the attribute descriptor to a stream.

Parameters

  outputTransient | if true, write out transient attributes

## ◆ writeMetadata()

void writeMetadata | ( | std::ostream & | ,
|  | bool | outputTransient = false,
|  | bool | paged = false ) const

This will write the attribute metadata to a stream.

Parameters

  outputTransient | if true, write out transient attributes
  paged | if true, data is written out in pages