source: lemon-0.x/src/work/alpar/smart_graph.h @ 107:8d62f0072ff0

// -*- mode:C++ -*-

#ifndef SMART_GRAPH_H
#define SMART_GRAPH_H

#include <iostream>
#include <vector>

namespace hugo {

  class SmartGraph {

    static const int INVALID=-1;

    struct NodeT 
    {
      int first_in,first_out;      
      NodeT() : first_in(INVALID), first_out(INVALID) {}
    };
    struct EdgeT 
    {
      int head, tail, next_in, next_out;      
      //FIXME: is this necessary?
      EdgeT() : next_in(INVALID), next_out(INVALID) {}  
    };

    std::vector<NodeT> nodes;
    std::vector<EdgeT> edges;
    

  public:

    class NodeIt;
    class EachNodeIt;
    class EdgeIt;
    class EachEdgeIt;
    class OutEdgeIt;
    class InEdgeIt;
    
    //      class NodeIt { int n; };
    //     class EachNodeIt : public NodeIt { };
    //     class EdgeIt { int n; };
    //     class EachEdgeIt : public EdgeIt {};
    //     class OutEdgeIt : public EdgeIt {};
    //     class InEdgeIt : public EdgeIt {};
    //    class SymEdgeIt;
    
    template <typename T> class NodeMap;
    template <typename T> class EdgeMap;
    
  public:

    /* default constructor */

    SmartGraph() : nodes(), edges() { }
    
    ~SmartGraph() {}

    int nodeNum() const { return nodes.size(); }  //FIXME: What is this?
    int edgeNum() const { return edges.size(); }  //FIXME: What is this?

    NodeIt tail(EdgeIt e) const { return edges[e.n].tail; }
    NodeIt head(EdgeIt e) const { return edges[e.n].head; }

    NodeIt aNode(const OutEdgeIt& e) const { return tail(e); }
    NodeIt aNode(const InEdgeIt& e) const { return head(e); }
    //NodeIt aNode(const SymEdgeIt& e) const { return e.aNode(); }

    NodeIt bNode(const OutEdgeIt& e) const { return head(e); }
    NodeIt bNode(const InEdgeIt& e) const { return tail(e); }
    //NodeIt bNode(const SymEdgeIt& e) const { return e.bNode(); }

    EachNodeIt& getFirst(EachNodeIt& v) const { 
      v=EachNodeIt(*this); return v; }
    EachEdgeIt& getFirst(EachEdgeIt& e) const { 
      e=EachEdgeIt(*this); return e; }
    OutEdgeIt& getFirst(OutEdgeIt& e, const NodeIt v) const { 
      e=OutEdgeIt(*this,v); return e; }
    InEdgeIt& getFirst(InEdgeIt& e, const NodeIt v) const { 
      e=InEdgeIt(*this,v); return e; }

    template< typename It >
    It first() const { 
      It e;
      getFirst(e);
      return e; 
    }

    template< typename It >
    It first(NodeIt v) const { 
      It e;
      getFirst(e, v);
      return e; 
    }

    bool valid(EdgeIt e) const { return e.n!=INVALID; }
    bool valid(EachEdgeIt e) const { return e.n<int(edges.size()); }
    bool valid(NodeIt n) const { return n.n<int(nodes.size()); }
    
    template <typename It> It next(It it) const
      //    { It tmp(it); return goNext(tmp); }
    { It tmp; tmp.n=it.n+1; return tmp; }

    NodeIt& goNext(NodeIt& it) const { ++it.n; return it; }
    OutEdgeIt& goNext(OutEdgeIt& it) const
    { it.n=edges[it.n].next_out; return it; }
    InEdgeIt& goNext(InEdgeIt& it) const
    { it.n=edges[it.n].next_in; return it; }
    EachEdgeIt& goNext(EachEdgeIt& it) const { ++it.n; return it; }

    int id(NodeIt v) const { return v.n; }
    int id(EdgeIt e) const { return e.n; }

    NodeIt addNode() {
      NodeIt n; n.n=nodes.size();
      nodes.push_back(NodeT()); //FIXME: Hmmm...
      return n;
    }
    EdgeIt addEdge(NodeIt u, NodeIt v) {
      EdgeIt e; e.n=edges.size(); edges.push_back(EdgeT()); //FIXME: Hmmm...
      edges[e.n].tail=u.n; edges[e.n].head=v.n;
      edges[e.n].next_out=nodes[u.n].first_out;
      edges[e.n].next_in=nodes[v.n].first_in;
      nodes[u.n].first_out=nodes[v.n].first_in=e.n;
      return e;
    }

    void clear() {nodes.clear();edges.clear();}

    class NodeIt {
      friend class SmartGraph;
      template <typename T> friend class NodeMap;
      
      friend class EdgeIt;
      friend class OutEdgeIt;
      friend class InEdgeIt;
      friend class SymEdgeIt;

    protected:
      int n;
      friend int SmartGraph::id(NodeIt v) const; 
    public:
      NodeIt() {}
      NodeIt(int nn) {n=nn;}
      bool operator==(const NodeIt i) const {return n==i.n;}
      bool operator!=(const NodeIt i) const {return n!=i.n;}
    };
    
    class EachNodeIt : public NodeIt {
      friend class SmartGraph;
    public:
      EachNodeIt(const SmartGraph& G) : NodeIt(0) { }
      EachNodeIt() : NodeIt() { }
    };

    class EdgeIt {
      friend class SmartGraph;
      template <typename T> friend class EdgeMap;
      
      friend class NodeIt;
      friend class EachNodeIt;
    protected:
      int n;
      friend int SmartGraph::id(EdgeIt e) const;
    public:
      EdgeIt() { }
      EdgeIt(int nn) {n=nn;}
      bool operator==(const EdgeIt i) const {return n==i.n;}
      bool operator!=(const EdgeIt i) const {return n!=i.n;}
    };
    
    class EachEdgeIt : public EdgeIt {
      friend class SmartGraph;
    public:
      EachEdgeIt(const SmartGraph& G) : EdgeIt(0) { }
      EachEdgeIt() : EdgeIt() { }
    };
    
    class OutEdgeIt : public EdgeIt {
      friend class SmartGraph;
    public: 
      OutEdgeIt() : EdgeIt() { }
      OutEdgeIt(const SmartGraph& G,const NodeIt v)
        : EdgeIt(G.nodes[v.n].first_out) {}
    };
    
    class InEdgeIt : public EdgeIt {
      friend class SmartGraph;
    public: 
      InEdgeIt() : EdgeIt() { }
      InEdgeIt(const SmartGraph& G,NodeIt v) :EdgeIt(G.nodes[v.n].first_in){}
    };

    // Map types

    template <typename T>
    class NodeMap {
      const SmartGraph& G; 
      std::vector<T> container;
    public:
      typedef T ValueType;
      typedef NodeIt KeyType;
      NodeMap(const SmartGraph& _G) : G(_G), container(G.nodeNum()) { }
      NodeMap(const SmartGraph& _G, T a) : 
        G(_G), container(G.nodeNum(), a) { }
      void set(NodeIt n, T a) { container[n.n]=a; }
      T get(NodeIt n) const { return container[n.n]; }
      T& operator[](NodeIt n) { return container[n.n]; }
      const T& operator[](NodeIt n) const { return container[n.n]; }
      void update() { container.resize(G.nodeNum()); }
      void update(T a) { container.resize(G.nodeNum(), a); }
    };

    template <typename T>
    class EdgeMap {
      const SmartGraph& G; 
      std::vector<T> container;
    public:
      typedef T ValueType;
      typedef EdgeIt KeyType;
      EdgeMap(const SmartGraph& _G) : G(_G), container(G.edgeNum()) { }
      EdgeMap(const SmartGraph& _G, T a) : 
        G(_G), container(G.edgeNum(), a) { }
      void set(EdgeIt e, T a) { container[e.n]=a; }
      T get(EdgeIt e) const { return container[e.n]; }
      T& operator[](EdgeIt e) { return container[e.n]; } 
      const T& operator[](EdgeIt e) const { return container[e.n]; } 
      void update() { container.resize(G.edgeNum()); }
      void update(T a) { container.resize(G.edgeNum(), a); }
    };




  };
} //namespace hugo

#endif //SMART_GRAPH_H