lemon-0.x: src/work/akos/simann.h@b16a10926781

     1 #ifndef LEMON_SIMANN_H

     2 #define LEMON_SIMANN_H

     4 namespace lemon {

     6   const double INFTY = 1e24;

     8   class SimAnnBase {

     9   public:

    10     class Controller;

    11   private:

    12     Controller *controller;

    13   protected:

    14     double curr_cost;

    15     double prev_cost;

    16     double best_cost;

    18     virtual void mutate() = 0;

    19     virtual void revert() = 0;

    20     virtual void saveAsBest() = 0;

    21   public:

    22     SimAnnBase() {

    23       curr_cost = prev_cost = best_cost = INFTY;

    24     }

    25     void setController(Controller &_controller) { controller = &_controller; }

    26     double getBestCost() { return best_cost; }

    27     void run() {

    28       while (controller->next()) {

    29         mutate();

    30         if (controller->accept(prev_cost - curr_cost)) {

    31           controller->acceptEvent();

    32           if (curr_cost < best_cost) {

    33             saveAsBest();

    34             controller->improveEvent();

    35           }

    36         }

    37         else {

    38           revert();

    39           controller->rejectEvent();

    40         }

    41       }

    42     }

    44     class Controller {

    45     public:

    46       virtual void acceptEvent() {}

    47       virtual void improveEvent() {}

    48       virtual void rejectEvent() {}

    49       virtual bool next() = 0;

    50       virtual bool accept(double cost_diff) = 0;

    51     };

    52   };

    54   template <typename E>

    55   class SimAnn : public SimAnnBase {

    56   private:

    57     E *curr_ent;

    58     E *prev_ent;

    59     E *best_ent;

    60   public:

    61     SimAnn() : SimAnnBase() {}

    62     void setEntity(E &Ent) {

    63       curr_ent = new E(Ent);

    64       prev_ent = new E(Ent);

    65       best_ent = new E(Ent);

    66     }

    67     E getBestEntity() { return *best_ent; }

    68     void mutate() {

    69       *prev_ent = *curr_ent;

    70       prev_cost = curr_cost;

    71       curr_cost = curr_ent->mutate();

    72     }

    73     void revert() {

    74       E *tmp = curr_ent;

    75       curr_ent = prev_ent;

    76       prev_ent = tmp;

    77       curr_cost = prev_cost;

    78     }

    79     void saveAsBest() {

    80       *best_ent = *curr_ent;

    81       best_cost = curr_cost;

    82     }

    83   };

    85   class EntitySkeleton {

    86   public:

    87     // returns the new cost

    88     double mutate() { return 0.0; }

    89   };

    91   template <typename E>

    92   class SimAnn2 : public SimAnnBase {

    93   private:

    94     E *curr_ent;

    95     E *best_ent;

    96   public:

    97     SimAnn2() : SimAnnBase() {}

    98     void setEntity(E &Ent) {

    99       curr_ent = new E(Ent);

   100       best_ent = new E(Ent);

   101     }

   102     E getBestEntity() { return *best_ent; }

   103     void mutate() {

   104       curr_ent->mutate();

   105     }

   106     void revert() {

   107       curr_ent->revert();

   108     }

   109     void saveAsBest() {

   110       *best_ent = *curr_ent;

   111       best_cost = curr_cost;

   112     }

   113   };

   115   class EntitySkeleton2 {

   116   public:

   117     // returns the new cost

   118     double mutate() { return 0.0; }

   119     // restores the entity to its previous state i.e. reverts the effects of

   120     // the last mutate()

   121     void revert() {}

   122   };

   124 }

   126 #endif

author	alpar
	Sat, 30 Oct 2004 18:30:29 +0000
changeset 949	b16a10926781
parent 918	bb77eaa8fa0e
child 956	0ff924405d21
permissions	-rw-r--r--