operations_research::ChristofidesPathSolver< CostType, ArcIndex, NodeIndex, CostFunction > Class Template Reference

Detailed Description

template<typename CostType, typename ArcIndex = int64, typename NodeIndex = int32, typename CostFunction = std::function<CostType(NodeIndex, NodeIndex)>>
class operations_research::ChristofidesPathSolver< CostType, ArcIndex, NodeIndex, CostFunction >

Definition at line 40 of file christofides.h.

Public Types
enum	MatchingAlgorithm { MatchingAlgorithm::MINIMUM_WEIGHT_MATCHING, MatchingAlgorithm::MINIMAL_WEIGHT_MATCHING }

Public Member Functions
	ChristofidesPathSolver (NodeIndex num_nodes, CostFunction costs)
void	SetMatchingAlgorithm (MatchingAlgorithm matching)
	Sets the matching algorith to use. More...
CostType	TravelingSalesmanCost ()
	Returns the cost of the approximate TSP tour. More...
std::vector< NodeIndex >	TravelingSalesmanPath ()
	Returns the approximate TSP tour. More...

Member Enumeration Documentation

MatchingAlgorithm

template<typename CostType , typename ArcIndex = int64, typename NodeIndex = int32, typename CostFunction = std::function<CostType(NodeIndex, NodeIndex)>>

enum operations_research::ChristofidesPathSolver::MatchingAlgorithm

strong

Enumerator
MINIMUM_WEIGHT_MATCHING
MINIMAL_WEIGHT_MATCHING

Definition at line 42 of file christofides.h.

Constructor & Destructor Documentation

ChristofidesPathSolver()

template<typename CostType , typename ArcIndex , typename NodeIndex , typename CostFunction >

operations_research::ChristofidesPathSolver< CostType, ArcIndex, NodeIndex, CostFunction >::ChristofidesPathSolver	(	NodeIndex	num_nodes,
		CostFunction	costs
	)

Definition at line 177 of file christofides.h.

Member Function Documentation

SetMatchingAlgorithm()

template<typename CostType , typename ArcIndex = int64, typename NodeIndex = int32, typename CostFunction = std::function<CostType(NodeIndex, NodeIndex)>>

void operations_research::ChristofidesPathSolver< CostType, ArcIndex, NodeIndex, CostFunction >::SetMatchingAlgorithm ( MatchingAlgorithm  matching )

inline

Sets the matching algorith to use.

A minimum weight perfect matching (MINIMUM_WEIGHT_MATCHING) guarantees the 3/2 upper bound to the optimal solution. A minimal weight perfect matching (MINIMAL_WEIGHT_MATCHING) finds a locally minimal weight matching which does not offer any bound guarantee but, as of 1/2017, is orders of magnitude faster than the minimum matching. By default, MINIMAL_WEIGHT_MATCHING is selected.

Todo:

(user): Change the default when minimum matching gets faster.

Definition at line 58 of file christofides.h.

TravelingSalesmanCost()

template<typename CostType , typename ArcIndex , typename NodeIndex , typename CostFunction >

CostType operations_research::ChristofidesPathSolver< CostType, ArcIndex, NodeIndex, CostFunction >::TravelingSalesmanCost

(

)

Returns the cost of the approximate TSP tour.

Definition at line 187 of file christofides.h.

TravelingSalesmanPath()

template<typename CostType , typename ArcIndex , typename NodeIndex , typename CostFunction >

std::vector< NodeIndex > operations_research::ChristofidesPathSolver< CostType, ArcIndex, NodeIndex, CostFunction >::TravelingSalesmanPath

(

)

Returns the approximate TSP tour.

Definition at line 197 of file christofides.h.

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

• christofides.h