operations_research::KnapsackSearchPath Class Reference

--— KnapsackSearchPath --— KnapsackSearchPath is a small class used to represent the path between a node to another node in the search tree. More...

#include <knapsack_solver.h>

Public Member Functions
	KnapsackSearchPath (const KnapsackSearchNode &from, const KnapsackSearchNode &to)
void	Init ()
const KnapsackSearchNode &	from () const
const KnapsackSearchNode &	via () const
const KnapsackSearchNode &	to () const
const KnapsackSearchNode *	MoveUpToDepth (const KnapsackSearchNode &node, int depth) const

Detailed Description

--— KnapsackSearchPath --— KnapsackSearchPath is a small class used to represent the path between a node to another node in the search tree.

As the solution state is not stored for each search node, the state should be rebuilt at each node. One simple solution is to apply all decisions between the node 'to' and the root. This can be computed in O(number_of_items).

However, it is possible to achieve better average complexity. Two consecutively explored nodes are usually close enough (i.e., much less than number_of_items) to benefit from an incremental update from the node 'from' to the node 'to'.

The 'via' field is the common parent of 'from' field and 'to' field. So the state can be built by reverting all decisions from 'from' to 'via' and then applying all decisions from 'via' to 'to'.

Definition at line 313 of file knapsack_solver.h.

Constructor & Destructor Documentation

KnapsackSearchPath()

operations_research::KnapsackSearchPath::KnapsackSearchPath	(	const KnapsackSearchNode &	from,
		const KnapsackSearchNode &	to
	)

Member Function Documentation

from()

const KnapsackSearchNode& operations_research::KnapsackSearchPath::from ( ) const

inline

Definition at line 318 of file knapsack_solver.h.

Init()

void operations_research::KnapsackSearchPath::Init

(

)

MoveUpToDepth()

const KnapsackSearchNode* operations_research::KnapsackSearchPath::MoveUpToDepth	(	const KnapsackSearchNode &	node,
		int	depth
	)		const

to()

const KnapsackSearchNode& operations_research::KnapsackSearchPath::to ( ) const

inline

Definition at line 320 of file knapsack_solver.h.

via()

const KnapsackSearchNode& operations_research::KnapsackSearchPath::via ( ) const

inline

Definition at line 319 of file knapsack_solver.h.

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

• knapsack_solver.h