__gnu_parallel::LoserTreeBase.3cxx

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Version: 352672 (ubuntu - 24/10/10)

Section: 3 (Bibliothèques de fonctions)

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NAME

__gnu_parallel::LoserTreeBase -

Guarded loser/tournament tree.

SYNOPSIS


Inherited by __gnu_parallel::LoserTree< stable, T, Comparator >, and __gnu_parallel::LoserTree< false, T, Comparator >.

Classes


struct Loser
Internal representation of a LoserTree element.

Public Member Functions


int get_min_source ()

void insert_start (const T &key, int source, bool sup)

LoserTreeBase (unsigned int _k, Comparator _comp)

~LoserTreeBase ()

Protected Attributes


unsigned int _M_log_k

Comparator comp

bool first_insert

unsigned int ik

unsigned int k

Loser * losers

unsigned int offset

Detailed Description

template<typename T, typename Comparator> class __gnu_parallel::LoserTreeBase< T, Comparator >

Guarded loser/tournament tree.

The smallest element is at the top.

Guarding is done explicitly through one flag sup per element, inf is not needed due to a better initialization routine. This is a well-performing variant.

Parameters:

T the element type
Comparator the comparator to use, defaults to std::less<T>

Definition at line 57 of file losertree.h.

Constructor & Destructor Documentation

template<typename T , typename Comparator > __gnu_parallel::LoserTreeBase< T, Comparator >::LoserTreeBase (unsigned int _k, Comparator _comp) [inline]

The constructor. Parameters:

_k The number of sequences to merge.
_comp The comparator to use.

Definition at line 96 of file losertree.h.

References __gnu_parallel::__log2(), __gnu_parallel::LoserTreeBase< T, Comparator >::_M_log_k, __gnu_parallel::LoserTreeBase< T, Comparator >::first_insert, and __gnu_parallel::LoserTreeBase< T, Comparator >::losers.

template<typename T , typename Comparator > __gnu_parallel::LoserTreeBase< T, Comparator >::~LoserTreeBase () [inline]

The destructor.

Definition at line 119 of file losertree.h.

References __gnu_parallel::LoserTreeBase< T, Comparator >::losers.

Member Function Documentation

template<typename T , typename Comparator > int __gnu_parallel::LoserTreeBase< T, Comparator >::get_min_source () [inline]Returns:

the index of the sequence with the smallest element.

Definition at line 152 of file losertree.h.

References __gnu_parallel::LoserTreeBase< T, Comparator >::losers, and __gnu_parallel::LoserTreeBase< T, Comparator >::Loser::source.

template<typename T , typename Comparator > void __gnu_parallel::LoserTreeBase< T, Comparator >::insert_start (const T & key, int source, bool sup) [inline]

Initializes the sequence 'source' with the element 'key'. Parameters:

key the element to insert
source index of the source sequence
sup flag that determines whether the value to insert is an explicit supremum.

Definition at line 131 of file losertree.h.

References __gnu_parallel::LoserTreeBase< T, Comparator >::first_insert, __gnu_parallel::LoserTreeBase< T, Comparator >::Loser::key, __gnu_parallel::LoserTreeBase< T, Comparator >::losers, __gnu_parallel::LoserTreeBase< T, Comparator >::Loser::source, and __gnu_parallel::LoserTreeBase< T, Comparator >::Loser::sup.

Member Data Documentation

template<typename T , typename Comparator > unsigned int __gnu_parallel::LoserTreeBase< T, Comparator >::_M_log_k [protected]log_2{k}

Definition at line 74 of file losertree.h.

Referenced by __gnu_parallel::LoserTreeBase< T, Comparator >::LoserTreeBase().

template<typename T , typename Comparator > Comparator __gnu_parallel::LoserTreeBase< T, Comparator >::comp [protected]

Comparator to use.

Definition at line 80 of file losertree.h.

template<typename T , typename Comparator > bool __gnu_parallel::LoserTreeBase< T, Comparator >::first_insert [protected]

State flag that determines whether the LoserTree is empty. Only used for building the LoserTree.

Definition at line 87 of file losertree.h.

Referenced by __gnu_parallel::LoserTreeBase< T, Comparator >::insert_start(), and __gnu_parallel::LoserTreeBase< T, Comparator >::LoserTreeBase().

template<typename T , typename Comparator > Loser* __gnu_parallel::LoserTreeBase< T, Comparator >::losers [protected]

LoserTree elements.

Definition at line 77 of file losertree.h.

Referenced by __gnu_parallel::LoserTreeBase< T, Comparator >::get_min_source(), __gnu_parallel::LoserTreeBase< T, Comparator >::insert_start(), __gnu_parallel::LoserTreeBase< T, Comparator >::LoserTreeBase(), and __gnu_parallel::LoserTreeBase< T, Comparator >::~LoserTreeBase().

Author

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