cudf::scalar Class Reference

An owning class to represent a singular value. More...

#include <scalar.hpp>

Inheritance diagram for cudf::scalar:

Public Member Functions
scalar &	operator= (scalar const &other)=delete
scalar &	operator= (scalar &&other)=delete
data_type	type () const noexcept
	Returns the scalar's logical value type. More...
void	set_valid_async (bool is_valid, rmm::cuda_stream_view stream=cudf::get_default_stream())
	Updates the validity of the value. More...
bool	is_valid (rmm::cuda_stream_view stream=cudf::get_default_stream()) const
	Indicates whether the scalar contains a valid value. More...
bool *	validity_data ()
	Returns a raw pointer to the validity bool in device memory. More...
bool const *	validity_data () const
	Return a const raw pointer to the validity bool in device memory. More...

Protected Member Functions
	scalar (scalar &&other)=default
	Move constructor for scalar. More...
	scalar (scalar const &other, rmm::cuda_stream_view stream=cudf::get_default_stream(), rmm::mr::device_memory_resource *mr=rmm::mr::get_current_device_resource())
	Construct a new scalar object by deep copying another. More...
	scalar (data_type type, bool is_valid=false, rmm::cuda_stream_view stream=cudf::get_default_stream(), rmm::mr::device_memory_resource *mr=rmm::mr::get_current_device_resource())
	Construct a new scalar object. More...

Protected Attributes
data_type	_type {type_id::EMPTY}
	Logical type of value in the scalar.
rmm::device_scalar< bool >	_is_valid
	Device bool signifying validity.

Detailed Description

An owning class to represent a singular value.

A scalar is a singular value of any of the supported datatypes in cudf. Classes derived from this class are used to represent a scalar. Objects of derived classes should be upcasted to this class while passing to an external libcudf API.

Definition at line 48 of file scalar.hpp.

Constructor & Destructor Documentation

scalar() [1/3]

cudf::scalar::scalar ( scalar &&  other )

protecteddefault

Move constructor for scalar.

Parameters

other

The other scalar to move from.

scalar() [2/3]

cudf::scalar::scalar ( scalar const &  other, rmm::cuda_stream_view  stream = cudf::get_default_stream(), rmm::mr::device_memory_resource *  mr = rmm::mr::get_current_device_resource()  )

protected

Construct a new scalar object by deep copying another.

Parameters

other	The scalar to copy.
stream	CUDA stream used for device memory operations.
mr	Device memory resource to use for device memory allocation.

scalar() [3/3]

cudf::scalar::scalar ( data_type  type, bool  is_valid = false, rmm::cuda_stream_view  stream = cudf::get_default_stream(), rmm::mr::device_memory_resource *  mr = rmm::mr::get_current_device_resource()  )

protected

Construct a new scalar object.

Note

Do not use this constructor directly. Instead, use a factory method like make_numeric_scalar or make_string_scalar

Parameters

type	Data type of the scalar.
is_valid	Whether the value held by the scalar is valid.
stream	CUDA stream used for device memory operations.
mr	Device memory resource to use for device memory allocation.

Member Function Documentation

is_valid()

bool cudf::scalar::is_valid

(

rmm::cuda_stream_view

stream = cudf::get_default_stream()

)

const

Indicates whether the scalar contains a valid value.

Note

Using the value when is_valid() == false is undefined behavior. In addition, this function does a stream synchronization.

Parameters

stream

CUDA stream used for device memory operations.

Returns

true Value is valid

false Value is invalid/null

set_valid_async()

void cudf::scalar::set_valid_async	(	bool	is_valid,
		rmm::cuda_stream_view	stream = cudf::get_default_stream()
	)

Updates the validity of the value.

Parameters

is_valid	true: set the value to valid. false: set it to null.
stream	CUDA stream used for device memory operations.

type()

data_type cudf::scalar::type ( ) const

noexcept

Returns the scalar's logical value type.

Returns

The scalar's logical value type

validity_data() [1/2]

bool* cudf::scalar::validity_data

(

)

Returns a raw pointer to the validity bool in device memory.

Returns

Raw pointer to the validity bool in device memory

validity_data() [2/2]

bool const* cudf::scalar::validity_data

(

)

const

Return a const raw pointer to the validity bool in device memory.

Returns

Raw pointer to the validity bool in device memory

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

• scalar.hpp