ladanyi@506: /* -*- mode: C++; indent-tabs-mode: nil; -*-
ladanyi@506:  *
ladanyi@506:  * This file is a part of LEMON, a generic C++ optimization library.
ladanyi@506:  *
ladanyi@506:  * Copyright (C) 2003-2009
ladanyi@506:  * Egervary Jeno Kombinatorikus Optimalizalasi Kutatocsoport
ladanyi@506:  * (Egervary Research Group on Combinatorial Optimization, EGRES).
ladanyi@506:  *
ladanyi@506:  * Permission to use, modify and distribute this software is granted
ladanyi@506:  * provided that this copyright notice appears in all copies. For
ladanyi@506:  * precise terms see the accompanying LICENSE file.
ladanyi@506:  *
ladanyi@506:  * This software is provided "AS IS" with no warranty of any kind,
ladanyi@506:  * express or implied, and with no claim as to its suitability for any
ladanyi@506:  * purpose.
ladanyi@506:  *
ladanyi@506:  */
ladanyi@506: 
ladanyi@506: #include <lemon/euler.h>
ladanyi@506: #include <lemon/list_graph.h>
kpeter@584: #include <lemon/adaptors.h>
kpeter@584: #include "test_tools.h"
ladanyi@506: 
ladanyi@506: using namespace lemon;
ladanyi@506: 
ladanyi@506: template <typename Digraph>
kpeter@584: void checkDiEulerIt(const Digraph& g,
kpeter@584:                     const typename Digraph::Node& start = INVALID)
ladanyi@506: {
kpeter@517:   typename Digraph::template ArcMap<int> visitationNumber(g, 0);
ladanyi@506: 
kpeter@584:   DiEulerIt<Digraph> e(g, start);
kpeter@584:   if (e == INVALID) return;
ladanyi@506:   typename Digraph::Node firstNode = g.source(e);
kpeter@517:   typename Digraph::Node lastNode = g.target(e);
kpeter@584:   if (start != INVALID) {
kpeter@584:     check(firstNode == start, "checkDiEulerIt: Wrong first node");
kpeter@584:   }
ladanyi@506: 
kpeter@584:   for (; e != INVALID; ++e) {
kpeter@584:     if (e != INVALID) lastNode = g.target(e);
ladanyi@506:     ++visitationNumber[e];
ladanyi@506:   }
ladanyi@506: 
ladanyi@506:   check(firstNode == lastNode,
kpeter@584:       "checkDiEulerIt: First and last nodes are not the same");
ladanyi@506: 
ladanyi@506:   for (typename Digraph::ArcIt a(g); a != INVALID; ++a)
ladanyi@506:   {
ladanyi@506:     check(visitationNumber[a] == 1,
kpeter@584:         "checkDiEulerIt: Not visited or multiple times visited arc found");
ladanyi@506:   }
ladanyi@506: }
ladanyi@506: 
ladanyi@506: template <typename Graph>
kpeter@584: void checkEulerIt(const Graph& g,
kpeter@584:                   const typename Graph::Node& start = INVALID)
ladanyi@506: {
kpeter@517:   typename Graph::template EdgeMap<int> visitationNumber(g, 0);
ladanyi@506: 
kpeter@584:   EulerIt<Graph> e(g, start);
kpeter@584:   if (e == INVALID) return;
kpeter@584:   typename Graph::Node firstNode = g.source(typename Graph::Arc(e));
kpeter@584:   typename Graph::Node lastNode = g.target(typename Graph::Arc(e));
kpeter@584:   if (start != INVALID) {
kpeter@584:     check(firstNode == start, "checkEulerIt: Wrong first node");
kpeter@584:   }
ladanyi@506: 
kpeter@584:   for (; e != INVALID; ++e) {
kpeter@584:     if (e != INVALID) lastNode = g.target(typename Graph::Arc(e));
ladanyi@506:     ++visitationNumber[e];
ladanyi@506:   }
ladanyi@506: 
ladanyi@506:   check(firstNode == lastNode,
kpeter@584:       "checkEulerIt: First and last nodes are not the same");
ladanyi@506: 
ladanyi@506:   for (typename Graph::EdgeIt e(g); e != INVALID; ++e)
ladanyi@506:   {
ladanyi@506:     check(visitationNumber[e] == 1,
kpeter@584:         "checkEulerIt: Not visited or multiple times visited edge found");
ladanyi@506:   }
ladanyi@506: }
ladanyi@506: 
ladanyi@506: int main()
ladanyi@506: {
ladanyi@506:   typedef ListDigraph Digraph;
kpeter@584:   typedef Undirector<Digraph> Graph;
kpeter@584:   
kpeter@584:   {
kpeter@584:     Digraph d;
kpeter@584:     Graph g(d);
kpeter@584:     
kpeter@584:     checkDiEulerIt(d);
kpeter@584:     checkDiEulerIt(g);
kpeter@584:     checkEulerIt(g);
ladanyi@506: 
kpeter@584:     check(eulerian(d), "This graph is Eulerian");
kpeter@584:     check(eulerian(g), "This graph is Eulerian");
kpeter@584:   }
ladanyi@506:   {
kpeter@584:     Digraph d;
kpeter@584:     Graph g(d);
kpeter@584:     Digraph::Node n = d.addNode();
ladanyi@506: 
kpeter@584:     checkDiEulerIt(d);
kpeter@584:     checkDiEulerIt(g);
kpeter@584:     checkEulerIt(g);
ladanyi@506: 
kpeter@584:     check(eulerian(d), "This graph is Eulerian");
kpeter@584:     check(eulerian(g), "This graph is Eulerian");
ladanyi@506:   }
kpeter@584:   {
kpeter@584:     Digraph d;
kpeter@584:     Graph g(d);
kpeter@584:     Digraph::Node n = d.addNode();
kpeter@584:     d.addArc(n, n);
ladanyi@506: 
kpeter@584:     checkDiEulerIt(d);
kpeter@584:     checkDiEulerIt(g);
kpeter@584:     checkEulerIt(g);
kpeter@584: 
kpeter@584:     check(eulerian(d), "This graph is Eulerian");
kpeter@584:     check(eulerian(g), "This graph is Eulerian");
kpeter@584:   }
ladanyi@506:   {
kpeter@584:     Digraph d;
kpeter@584:     Graph g(d);
kpeter@584:     Digraph::Node n1 = d.addNode();
kpeter@584:     Digraph::Node n2 = d.addNode();
kpeter@584:     Digraph::Node n3 = d.addNode();
kpeter@584:     
kpeter@584:     d.addArc(n1, n2);
kpeter@584:     d.addArc(n2, n1);
kpeter@584:     d.addArc(n2, n3);
kpeter@584:     d.addArc(n3, n2);
ladanyi@506: 
kpeter@584:     checkDiEulerIt(d);
kpeter@584:     checkDiEulerIt(d, n2);
kpeter@584:     checkDiEulerIt(g);
kpeter@584:     checkDiEulerIt(g, n2);
kpeter@584:     checkEulerIt(g);
kpeter@584:     checkEulerIt(g, n2);
ladanyi@506: 
kpeter@584:     check(eulerian(d), "This graph is Eulerian");
kpeter@584:     check(eulerian(g), "This graph is Eulerian");
ladanyi@506:   }
kpeter@584:   {
kpeter@584:     Digraph d;
kpeter@584:     Graph g(d);
kpeter@584:     Digraph::Node n1 = d.addNode();
kpeter@584:     Digraph::Node n2 = d.addNode();
kpeter@584:     Digraph::Node n3 = d.addNode();
kpeter@584:     Digraph::Node n4 = d.addNode();
kpeter@584:     Digraph::Node n5 = d.addNode();
kpeter@584:     Digraph::Node n6 = d.addNode();
kpeter@584:     
kpeter@584:     d.addArc(n1, n2);
kpeter@584:     d.addArc(n2, n4);
kpeter@584:     d.addArc(n1, n3);
kpeter@584:     d.addArc(n3, n4);
kpeter@584:     d.addArc(n4, n1);
kpeter@584:     d.addArc(n3, n5);
kpeter@584:     d.addArc(n5, n2);
kpeter@584:     d.addArc(n4, n6);
kpeter@584:     d.addArc(n2, n6);
kpeter@584:     d.addArc(n6, n1);
kpeter@584:     d.addArc(n6, n3);
ladanyi@506: 
kpeter@584:     checkDiEulerIt(d);
kpeter@584:     checkDiEulerIt(d, n1);
kpeter@584:     checkDiEulerIt(d, n5);
kpeter@584: 
kpeter@584:     checkDiEulerIt(g);
kpeter@584:     checkDiEulerIt(g, n1);
kpeter@584:     checkDiEulerIt(g, n5);
kpeter@584:     checkEulerIt(g);
kpeter@584:     checkEulerIt(g, n1);
kpeter@584:     checkEulerIt(g, n5);
kpeter@584: 
kpeter@584:     check(eulerian(d), "This graph is Eulerian");
kpeter@584:     check(eulerian(g), "This graph is Eulerian");
kpeter@584:   }
ladanyi@506:   {
kpeter@584:     Digraph d;
kpeter@584:     Graph g(d);
kpeter@584:     Digraph::Node n0 = d.addNode();
kpeter@584:     Digraph::Node n1 = d.addNode();
kpeter@584:     Digraph::Node n2 = d.addNode();
kpeter@584:     Digraph::Node n3 = d.addNode();
kpeter@584:     Digraph::Node n4 = d.addNode();
kpeter@584:     Digraph::Node n5 = d.addNode();
kpeter@584:     
kpeter@584:     d.addArc(n1, n2);
kpeter@584:     d.addArc(n2, n3);
kpeter@584:     d.addArc(n3, n1);
ladanyi@506: 
kpeter@584:     checkDiEulerIt(d);
kpeter@584:     checkDiEulerIt(d, n2);
ladanyi@506: 
kpeter@584:     checkDiEulerIt(g);
kpeter@584:     checkDiEulerIt(g, n2);
kpeter@584:     checkEulerIt(g);
kpeter@584:     checkEulerIt(g, n2);
kpeter@584: 
kpeter@584:     check(!eulerian(d), "This graph is not Eulerian");
kpeter@584:     check(!eulerian(g), "This graph is not Eulerian");
ladanyi@506:   }
kpeter@584:   {
kpeter@584:     Digraph d;
kpeter@584:     Graph g(d);
kpeter@584:     Digraph::Node n1 = d.addNode();
kpeter@584:     Digraph::Node n2 = d.addNode();
kpeter@584:     Digraph::Node n3 = d.addNode();
kpeter@584:     
kpeter@584:     d.addArc(n1, n2);
kpeter@584:     d.addArc(n2, n3);
ladanyi@506: 
kpeter@584:     check(!eulerian(d), "This graph is not Eulerian");
kpeter@584:     check(!eulerian(g), "This graph is not Eulerian");
ladanyi@506:   }
ladanyi@506: 
ladanyi@506:   return 0;
ladanyi@506: }