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>

List of all members.

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

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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 (ie. much less than number_of_items) to benefit from an incremental update from the node 'from' to the node 'to'. '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 applying all decisions from 'via' to 'to'.

Definition at line 292 of file knapsack_solver.h.

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Constructor & Destructor Documentation

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

KnapsackSearchPath.

Definition at line 113 of file knapsack_solver.cc.

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Member Function Documentation

void operations_research::KnapsackSearchPath::Init

(

)

Definition at line 120 of file knapsack_solver.cc.

const KnapsackSearchNode& operations_research::KnapsackSearchPath::from

(

)

const [inline]

Definition at line 297 of file knapsack_solver.h.

const KnapsackSearchNode& operations_research::KnapsackSearchPath::via

(

)

const [inline]

Definition at line 298 of file knapsack_solver.h.

const KnapsackSearchNode& operations_research::KnapsackSearchPath::to

(

)

const [inline]

Definition at line 299 of file knapsack_solver.h.

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

Definition at line 133 of file knapsack_solver.cc.

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

• or-tools/src/algorithms/knapsack_solver.h
• or-tools/src/algorithms/knapsack_solver.cc