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/*===========================================================================*
 * This file is part of the Abstract Library for Parallel Search (ALPS).     *
 *                                                                           *
 * ALPS is distributed under the Common Public License as part of the        *
 * COIN-OR repository (http://www.coin-or.org).                              *
 *                                                                           *
 * Authors:                                                                  *
 *                                                                           *
 *          Yan Xu, Lehigh University                                        *
 *          Ted Ralphs, Lehigh University                                    *
 *                                                                           *
 * Conceptual Design:                                                        *
 *                                                                           *
 *          Yan Xu, Lehigh University                                        *
 *          Ted Ralphs, Lehigh University                                    *
 *          Laszlo Ladanyi, IBM T.J. Watson Research Center                  *
 *          Matthew Saltzman, Clemson University                             *
 *                                                                           * 
 *                                                                           *
 * Copyright (C) 2001-2007, Lehigh University, Yan Xu, and Ted Ralphs.       *
 *===========================================================================*/

#ifndef AlpsSolutionPool_h_
#define AlpsSolutionPool_h_

#include "AlpsKnowledgePool.h"
#include "AlpsSolution.h"

//#############################################################################

class AlpsSolutionPool : public AlpsKnowledgePool {
    // *FIXME* ? : we do want to allow solutions with the same priority, but do
    // *FIXME* ? : we want to allow identical solutions?
 private:
    AlpsSolutionPool(const AlpsSolutionPool&);
    AlpsSolutionPool& operator=(const AlpsSolutionPool&);

 private:
//    std::multimap< double, CoinSharedPtr<AlpsSolution> > solutions_;
    std::multimap< double, AlpsSolution* > solutions_;
    int maxNumSolutions_;

//    inline void addSolution(CoinSharedPtr<AlpsSolution> sol, 
//                          double priority) {
//      solutions_.insert(std::make_pair(priority, sol));
//      if (maxNumSolutions_ > 0 && solutions_.size() > maxNumSolutions_) {
//          std::multimap< double, CoinSharedPtr<AlpsSolution> >::
//              iterator si = solutions_.end();
//          --si;
//          solutions_.erase(si);
//      }
//    }

 public:
    AlpsSolutionPool(int maxsols = 1) : maxNumSolutions_(maxsols) {}
    virtual ~AlpsSolutionPool() {
        if (! solutions_.empty()) {
            clean();
        }
    }

    //   int getNumSolutions() const { return solutions_.size(); }
    inline int getNumKnowledges() const { return static_cast<int> (solutions_.size()); }

    inline bool hasKnowledge() const 
        { return solutions_.empty() ? false : true; }

//    inline std::pair<AlpsKnowledge*, double> getKnowledge() const {
//      return std::make_pair(solutions_.begin()->second.get(),
//                            solutions_.begin()->first);
//    }
    inline std::pair<AlpsKnowledge*, double> getKnowledge() const {
        return std::make_pair(static_cast<AlpsKnowledge *>
                              (solutions_.begin()->second),
                              solutions_.begin()->first);
    }

    inline void popKnowledge() {
        throw CoinError("Can not call popKnowledge()",
                        "popKnowledge()", "AlpsSolutionPool");
    }

    //   void addSolution(const AlpsSolution* sol, double priority) {
    //   CoinSharedPtr<const AlpsSolution> ssol(sol);
    //   addSolution(ssol, priority);
    // }

//  inline void addKnowledge(AlpsKnowledge* sol, double priority=0) {
//      CoinSharedPtr<AlpsSolution> 
//          ssol( dynamic_cast<AlpsSolution*>(sol) );
//      addSolution(ssol, priority);
//  }
    inline void addKnowledge(AlpsKnowledge* sol, double priority) {
        std::pair<const double, AlpsSolution*> ps(priority, dynamic_cast<AlpsSolution*>(sol));
        solutions_.insert(ps);
        //solutions_.insert(std::make_pair(priority, 
//                                       (AlpsSolution*)sol));
        if ((maxNumSolutions_ > 0) && 
            (static_cast<int>(solutions_.size()) > maxNumSolutions_)) {
            std::multimap< double, AlpsSolution* >::iterator si = 
                solutions_.end();
            --si;
            AlpsSolution* sol = si->second;
            solutions_.erase(si);
            delete sol;
        }
    }

    inline int getMaxNumKnowledges() const { return maxNumSolutions_; }

//  inline void setMaxNumKnowledges(int maxsols) {
//      if (maxsols > 0) {
//          if (solutions_.size() > maxsols) {
//              std::multimap< double, CoinSharedPtr<AlpsSolution> >::
//                  iterator si = solutions_.begin();
//              for (int i = 0; i < maxsols; ++i)
//                  ++si;
//              solutions_.erase(si, solutions_.end());
//          }
//      }
//      maxNumSolutions_ = maxsols;
//  }
    inline void setMaxNumKnowledges(int maxsols) {
        if (maxsols > 0) {
            if (static_cast<int>(solutions_.size()) > maxsols) {
                std::multimap<double, AlpsSolution*>::
                    iterator si = solutions_.begin();
                for (int i = 0; i < maxsols; ++i)
                    ++si;
                solutions_.erase(si, solutions_.end());
            }
        }
        maxNumSolutions_ = maxsols;
    }

//    inline std::pair<AlpsKnowledge*, double> getBestKnowledge() const {
//      return std::make_pair(solutions_.begin()->second.get(),
//                            solutions_.begin()->first);
//    }
    inline std::pair<AlpsKnowledge*, double> getBestKnowledge() const {
        return std::make_pair(static_cast<AlpsKnowledge *>
                              (solutions_.begin()->second),
                              solutions_.begin()->first);
    }

//  inline void getAllKnowledges
//      (std::vector<std::pair<AlpsKnowledge*, double> >& sols) const {
//      sols.reserve(sols.size() + solutions_.size());
//      std::multimap< double, CoinSharedPtr<AlpsSolution> >::
//          const_iterator si;
//      for (si = solutions_.begin(); si != solutions_.end(); ++si) {
//          sols.push_back(std::make_pair(si->second.get(), si->first));
//      }
//  }
    inline void getAllKnowledges
        (std::vector<std::pair<AlpsKnowledge*, double> >& sols) const {
        sols.reserve(sols.size() + solutions_.size());
        std::multimap<double, AlpsSolution*>::const_iterator si;
        for (si = solutions_.begin(); si != solutions_.end(); ++si) {
            sols.push_back(std::make_pair(static_cast<AlpsKnowledge *>
                                          (si->second), si->first));
        }
    }
    
    void clean() {
        while (!solutions_.empty()) {
            std::multimap< double, AlpsSolution* >::iterator si = 
                solutions_.end();
            --si;
            AlpsSolution* sol = si->second;
            solutions_.erase(si);
            delete sol;
            sol = NULL;
        }
        
        //for_each(solutions_.begin(), solutions_.end(), DeletePtrObject());
    }
};



#define AlpsSolutionInterface(ref)                                      \
int getNumSolutions() const {                                           \
   (ref).getNumSolutions();                                             \
}                                                                       \
int getMaxNumSolutions() const {                                        \
   return (ref).getMaxNumSolutions();                                   \
}                                                                       \
void setMaxNumSolutions(int num) {                                      \
   (ref).setMaxNumSolutions(num);                                       \
}                                                                       \
bool hasSolution() const {                                              \
   return (ref).hasSolution();                                          \
}                                                                       \
std::pair<const AlpsSolution*, double> getBestSolution() const {        \
   return (ref).getBestSolution();                                      \
}                                                                       \
void getAllSolutions                                                    \
   (std::vector<std::pair<const AlpsSolution*, double> >& sols) {       \
   return (ref).getAllSolutions(sols);                                  \
}                                                                       \
void addSolution(const AlpsSolution* sol, double priority) {            \
   (ref).addSolution(sol, priority);                                    \
}

#endif

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