__gnu_parallel::_LoserTreeBase< _Tp, _Compare >

NAME

__gnu_parallel::_LoserTreeBase< _Tp, _Compare > − Guarded loser/tournament tree.

SYNOPSIS

Inherited by __gnu_parallel::_LoserTree< __stable, _Tp, _Compare >, and __gnu_parallel::_LoserTree< false, _Tp, _Compare >.

Classes

struct _Loser
Internal representation of a _LoserTree element.

Public Member Functions

_LoserTreeBase (unsigned int __k, _Compare __comp)
The constructor.
~_LoserTreeBase ()
The destructor.
int __get_min_source ()
void __insert_start (const _Tp &__key, int __source, bool __sup)
Initializes the sequence ’_M_source’ with the element ’__key’.

Protected Attributes

_Compare _M_comp
_Compare to use.
bool _M_first_insert
State flag that determines whether the _LoserTree is empty.
unsigned int _M_ik
unsigned int _M_k
unsigned int _M_log_k
_Loser * _M_losers
_LoserTree __elements.
unsigned int _M_offset

Detailed Description

template<typename _Tp, typename _Compare>
class __gnu_parallel::_LoserTreeBase< _Tp, _Compare >" Guarded loser/tournament tree.

The smallest element is at the top.

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

Parameters:

_Tp the element type
_Compare the comparator to use, defaults to std::less<_Tp>

Definition at line 55 of file losertree.h.

Constructor & Destructor Documentation

template<typename _Tp , typename _Compare > __gnu_parallel::_LoserTreeBase< _Tp, _Compare >::_LoserTreeBase (unsigned int __k, _Compare __comp) [inline]
The constructor.

Parameters:

__k The number of sequences to merge.
__comp The comparator to use.

Definition at line 94 of file losertree.h.

References __gnu_parallel::__rd_log2(), __gnu_parallel::_LoserTreeBase< _Tp, _Compare >::_M_log_k, and __gnu_parallel::_LoserTreeBase< _Tp, _Compare >::_Loser::_M_sup.

template<typename _Tp , typename _Compare > __gnu_parallel::_LoserTreeBase< _Tp, _Compare >::~_LoserTreeBase () [inline]
The destructor.

Definition at line 118 of file losertree.h.

References __gnu_parallel::_LoserTreeBase< _Tp, _Compare >::_M_losers.

Member Function Documentation

template<typename _Tp , typename _Compare > int __gnu_parallel::_LoserTreeBase< _Tp, _Compare >::__get_min_source () [inline]
Returns:

the index of the sequence with the smallest element.

Definition at line 155 of file losertree.h.

References __gnu_parallel::_LoserTreeBase< _Tp, _Compare >::_Loser::_M_source.

template<typename _Tp , typename _Compare > void __gnu_parallel::_LoserTreeBase< _Tp, _Compare >::__insert_start (const _Tp & __key, int __source, bool __sup) [inline]
Initializes the sequence ’_M_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 134 of file losertree.h.

References __gnu_parallel::_LoserTreeBase< _Tp, _Compare >::_Loser::_M_key, __gnu_parallel::_LoserTreeBase< _Tp, _Compare >::_Loser::_M_source, and __gnu_parallel::_LoserTreeBase< _Tp, _Compare >::_Loser::_M_sup.

Member Data Documentation

template<typename _Tp , typename _Compare > _Compare __gnu_parallel::_LoserTreeBase< _Tp, _Compare >::_M_comp [protected]
_Compare to use.

Definition at line 78 of file losertree.h.

Referenced by __gnu_parallel::_LoserTree< false, _Tp, _Compare >::__init_winner().

template<typename _Tp , typename _Compare > bool __gnu_parallel::_LoserTreeBase< _Tp, _Compare >::_M_first_insert [protected]
State flag that determines whether the _LoserTree is empty. Only used for building the _LoserTree.

Definition at line 85 of file losertree.h.

template<typename _Tp , typename _Compare > unsigned int __gnu_parallel::_LoserTreeBase< _Tp, _Compare >::_M_log_k [protected]
log_2{_M_k}

Definition at line 72 of file losertree.h.

Referenced by __gnu_parallel::_LoserTreeBase< _Tp, _Compare >::_LoserTreeBase().

template<typename _Tp , typename _Compare > _Loser* __gnu_parallel::_LoserTreeBase< _Tp, _Compare >::_M_losers [protected]
_LoserTree __elements.

Definition at line 75 of file losertree.h.

Referenced by __gnu_parallel::_LoserTree< false, _Tp, _Compare >::__init_winner(), and __gnu_parallel::_LoserTreeBase< _Tp, _Compare >::~_LoserTreeBase().

Author

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