cub::ReduceBySegmentOp< ReductionOpT > Struct Template Reference

Reduce-by-segment functor. More...

Detailed Description

template<typename ReductionOpT>
struct cub::ReduceBySegmentOp< ReductionOpT >

Reduce-by-segment functor.

Given two cub::KeyValuePair inputs a and b and a binary associative combining operator f(const T &x, const T &y), an instance of this functor returns a cub::KeyValuePair whose key field is a.key + b.key, and whose value field is either b.value if b.key is non-zero, or f(a.value, b.value) otherwise.

ReduceBySegmentOp is an associative, non-commutative binary combining operator for input sequences of cub::KeyValuePair pairings. Such sequences are typically used to represent a segmented set of values to be reduced and a corresponding set of {0,1}-valued integer "head flags" demarcating the first value of each segment. < Binary reduction operator to apply to values

Definition at line 252 of file thread_operators.cuh.

Public Member Functions
__host__ __device__ __forceinline__	ReduceBySegmentOp ()
	Constructor.
__host__ __device__ __forceinline__	ReduceBySegmentOp (ReductionOpT op)
	Constructor.
template<typename KeyValuePairT >
__host__ __device__ __forceinline__ KeyValuePairT	operator() (const KeyValuePairT &first, const KeyValuePairT &second)
	Scan operator.

Data Fields
ReductionOpT	op
	Wrapped reduction operator.

Constructor & Destructor Documentation

ReduceBySegmentOp() [1/2]

template<typename ReductionOpT >

__host__ __device__ __forceinline__ cub::ReduceBySegmentOp< ReductionOpT >::ReduceBySegmentOp ( )

inline

Constructor.

Definition at line 258 of file thread_operators.cuh.

ReduceBySegmentOp() [2/2]

template<typename ReductionOpT >

__host__ __device__ __forceinline__ cub::ReduceBySegmentOp< ReductionOpT >::ReduceBySegmentOp ( ReductionOpT  op )

inline

Constructor.

Definition at line 261 of file thread_operators.cuh.

Member Function Documentation

operator()()

template<typename ReductionOpT >

template<typename KeyValuePairT >

__host__ __device__ __forceinline__ KeyValuePairT cub::ReduceBySegmentOp< ReductionOpT >::operator() ( const KeyValuePairT &  first, const KeyValuePairT &  second  )

inline

Scan operator.

< KeyValuePair pairing of T (value) and OffsetT (head flag)

Parameters

first	First partial reduction
second	Second partial reduction

Definition at line 265 of file thread_operators.cuh.

Field Documentation

op

template<typename ReductionOpT >

ReductionOpT cub::ReduceBySegmentOp< ReductionOpT >::op

Wrapped reduction operator.

Definition at line 255 of file thread_operators.cuh.

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

• openfpm_data/src/util/cuda/cub_old/thread/thread_operators.cuh