forked from github/verilator
54 lines
1.9 KiB
C++
54 lines
1.9 KiB
C++
// -*- mode: C++; c-file-style: "cc-mode" -*-
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//*************************************************************************
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// DESCRIPTION: Verilator: Implementation of Christofides' algorithm to
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// approximate the solution to the traveling salesman problem.
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//
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// Code available from: https://verilator.org
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//
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//*************************************************************************
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//
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// Copyright 2003-2020 by Wilson Snyder. This program is free software; you
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// can redistribute it and/or modify it under the terms of either the GNU
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// Lesser General Public License Version 3 or the Perl Artistic License
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// Version 2.0.
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// SPDX-License-Identifier: LGPL-3.0-only OR Artistic-2.0
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//
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//*************************************************************************
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#ifndef _V3TSP_H_
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#define _V3TSP_H_ 1
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#include "config_build.h"
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#include "verilatedos.h"
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#include "V3Error.h"
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namespace V3TSP {
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// Perform a "Traveling Salesman Problem" optimizing sort
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// on any type you like -- so long as inherits from TspStateBase.
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class TspStateBase {
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public:
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// This is the cost function that the TSP sort will minimize.
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// All costs in V3TSP are int, chosen to match the type of
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// V3GraphEdge::weight() which will reflect each edge's cost.
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virtual int cost(const TspStateBase* otherp) const = 0;
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// This operator< must place a meaningless, arbitrary, but
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// stable order on all TspStateBase's. It's used only to
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// key maps so that iteration is stable, without relying
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// on pointer values that could lead to nondeterminism.
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virtual bool operator<(const TspStateBase& otherp) const = 0;
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};
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typedef std::vector<const TspStateBase*> StateVec;
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// Given an unsorted set of TspState's, sort them to minimize
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// the transition cost for walking the sorted list.
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void tspSort(const StateVec& states, StateVec* resultp);
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void selfTest();
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} // namespace V3TSP
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#endif // Guard
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