cudf::experimental::row::hash::element_hasher< hash_function, Nullate > Class Template Reference

Computes the hash value of an element in the given column. More...

Public Member Functions
	element_hasher (Nullate nulls, uint32_t seed=DEFAULT_HASH_SEED, hash_value_type null_hash=std::numeric_limits< hash_value_type >::max()) noexcept
	Constructs an element_hasher object. More...
template<typename T , CUDF_ENABLE_IF(column_device_view::has_element_accessor< T >()) >
hash_value_type	operator() (column_device_view const &col, size_type row_index) const noexcept
	Returns the hash value of the given element. More...
template<typename T , CUDF_ENABLE_IF(not column_device_view::has_element_accessor< T >()) >
hash_value_type	operator() (column_device_view const &col, size_type row_index) const noexcept
	Returns the hash value of the given element. More...

Public Attributes
Nullate	_check_nulls
	Whether to check for nulls.
uint32_t	_seed
	The seed to use for hashing.
hash_value_type	_null_hash
	Hash value to use for null elements.

Detailed Description

template<template< typename > class hash_function, typename Nullate>
class cudf::experimental::row::hash::element_hasher< hash_function, Nullate >

Computes the hash value of an element in the given column.

Template Parameters

hash_function	Hash functor to use for hashing elements.
Nullate	A cudf::nullate type describing whether to check for nulls.

Definition at line 1800 of file experimental/row_operators.cuh.

Constructor & Destructor Documentation

element_hasher()

template<template< typename > class hash_function, typename Nullate >

cudf::experimental::row::hash::element_hasher< hash_function, Nullate >::element_hasher ( Nullate  nulls, uint32_t  seed = DEFAULT_HASH_SEED, hash_value_type  null_hash = std::numeric_limits<hash_value_type>::max()  )

inlinenoexcept

Constructs an element_hasher object.

Parameters

nulls	Indicates whether to check for nulls
seed	The seed to use for the hash function
null_hash	The hash value to use for nulls

Definition at line 1809 of file experimental/row_operators.cuh.

Member Function Documentation

operator()() [1/2]

template<template< typename > class hash_function, typename Nullate >

template<typename T , CUDF_ENABLE_IF(column_device_view::has_element_accessor< T >()) >

hash_value_type cudf::experimental::row::hash::element_hasher< hash_function, Nullate >::operator() ( column_device_view const &  col, size_type  row_index  ) const

inlinenoexcept

Returns the hash value of the given element.

Template Parameters

T	The type of the element to hash

Parameters

col	The column to hash
row_index	The index of the row to hash

Returns

The hash value of the given element

Definition at line 1826 of file experimental/row_operators.cuh.

operator()() [2/2]

template<template< typename > class hash_function, typename Nullate >

template<typename T , CUDF_ENABLE_IF(not column_device_view::has_element_accessor< T >()) >

hash_value_type cudf::experimental::row::hash::element_hasher< hash_function, Nullate >::operator() ( column_device_view const &  col, size_type  row_index  ) const

inlinenoexcept

Returns the hash value of the given element.

Template Parameters

T	The type of the element to hash

Parameters

col	The column to hash
row_index	The index of the row to hash

Returns

The hash value of the given element

Definition at line 1842 of file experimental/row_operators.cuh.

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

• experimental/row_operators.cuh