cudf::element_hasher_with_seed< hash_function, Nullate > Class Template Reference

Function object for computing the hash value of a row in a column. More...

Public Member Functions
	element_hasher_with_seed (Nullate has_nulls, uint32_t seed)
	Constructs a function object for hashing an element in the given column. More...
	element_hasher_with_seed (Nullate has_nulls, uint32_t seed, hash_value_type null_hash)
	Constructs a function object for hashing an element in the given column. More...
template<typename T , CUDF_ENABLE_IF(column_device_view::has_element_accessor< T >()) >
hash_value_type	operator() (column_device_view col, size_type row_index) const
	Returns the hash value of the given element in the given column. More...
template<typename T , CUDF_ENABLE_IF(not column_device_view::has_element_accessor< T >()) >
hash_value_type	operator() (column_device_view col, size_type row_index) const
	Returns the hash value of the given element in the given column. More...

Detailed Description

template<template< typename > class hash_function, typename Nullate>
class cudf::element_hasher_with_seed< hash_function, Nullate >

Function object for computing the hash value of a row in a column.

Template Parameters

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

Definition at line 500 of file row_operators.cuh.

Constructor & Destructor Documentation

element_hasher_with_seed() [1/2]

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

cudf::element_hasher_with_seed< hash_function, Nullate >::element_hasher_with_seed ( Nullate  has_nulls, uint32_t  seed  )

inline

Constructs a function object for hashing an element in the given column.

Parameters

has_nulls	Indicates if either input column contains nulls
seed	The seed to use for the hash function

Definition at line 508 of file row_operators.cuh.

element_hasher_with_seed() [2/2]

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

cudf::element_hasher_with_seed< hash_function, Nullate >::element_hasher_with_seed ( Nullate  has_nulls, uint32_t  seed, hash_value_type  null_hash  )

inline

Constructs a function object for hashing an element in the given column.

Parameters

has_nulls	Indicates if either input column contains nulls
seed	The seed to use for the hash function
null_hash	The hash value to use for null elements

Definition at line 520 of file 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::element_hasher_with_seed< hash_function, Nullate >::operator() ( column_device_view  col, size_type  row_index  ) const

inline

Returns the hash value of the given element in the given column.

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 534 of file 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::element_hasher_with_seed< hash_function, Nullate >::operator() ( column_device_view  col, size_type  row_index  ) const

inline

Returns the hash value of the given element in the given column.

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 549 of file row_operators.cuh.

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

• row_operators.cuh