Detailed Description

template<typename Key, typename HashFunction = std::hash<Key>>
class thrill::core::ReduceByHash< Key, HashFunction >

A reduce index function which returns a hash index and partition.

It is used by ReduceByKey.

Definition at line 31 of file reduce_functional.hpp.

#include <reduce_functional.hpp>

Classes
struct	Result

Public Member Functions
	ReduceByHash (const HashFunction &hash_function=HashFunction())

	ReduceByHash (const uint64_t &salt, const HashFunction &hash_function=HashFunction())

	ReduceByHash (const uint64_t &salt, const ReduceByHash &other)

Result	operator() (const Key &k, const size_t &num_partitions, const size_t &, const size_t &) const

Private Attributes
HashFunction	hash_function_

uint64_t	salt_

Constructor & Destructor Documentation

◆ ReduceByHash() [1/3]

ReduceByHash ( const HashFunction & hash_function = HashFunction() )

inlineexplicit

Definition at line 47 of file reduce_functional.hpp.

◆ ReduceByHash() [2/3]

ReduceByHash	(	const uint64_t &	salt,
		const HashFunction &	hash_function = `HashFunction()`
	)

inlineexplicit

Definition at line 51 of file reduce_functional.hpp.

◆ ReduceByHash() [3/3]

ReduceByHash	(	const uint64_t &	salt,
		const ReduceByHash< Key, HashFunction > &	other
	)

inline

Definition at line 56 of file reduce_functional.hpp.

Member Function Documentation

◆ operator()()

Result operator()	(	const Key &	k,
		const size_t &	num_partitions,
		const size_t &	,
		const size_t &
	)		const

inline

Definition at line 60 of file reduce_functional.hpp.

References thrill::common::Hash128to64(), ReduceByHash< Key, HashFunction >::hash_function_, ReduceByHash< Key, HashFunction >::Result::partition_id, ReduceByHash< Key, HashFunction >::Result::remaining_hash, and ReduceByHash< Key, HashFunction >::salt_.

Member Data Documentation

◆ hash_function_

HashFunction hash_function_

private

Definition at line 76 of file reduce_functional.hpp.

Referenced by ReduceByHash< Key, HashFunction >::operator()().

◆ salt_

uint64_t salt_

private

Definition at line 75 of file reduce_functional.hpp.