poolslotref.h

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#pragma once
 
#include <ogdf/lib/abacus/poolslot.h>
#include <ogdf/lib/abacus/master.h>
#include <ogdf/lib/abacus/constraint.h>
#include <ogdf/lib/abacus/variable.h>
 
namespace abacus {
 
template<class BaseType, class CoType>
class  PoolSlotRef;
 
template<class BaseType, class CoType>
std::ostream &operator<< (std::ostream &out, const PoolSlotRef<BaseType, CoType> &slot);
 
 
 
template<class BaseType, class CoType>
class  PoolSlotRef :  public AbacusRoot {
public:
 
 
    PoolSlotRef(Master *master) : master_(master), slot_(0), version_(0) { }
 
 
    PoolSlotRef(PoolSlot<BaseType, CoType> *slot) : master_(slot->master()), slot_(slot), version_(slot->version())
    {
        ConVar *cv = slot_->conVar();
        if(cv) cv->addReference();
    }
 
 
    PoolSlotRef(const PoolSlotRef<BaseType, CoType> &rhs) : master_(rhs.master_), slot_(rhs.slot_), version_(rhs.version_)
    {
        ConVar *cv = slot_->conVar();
        if (version_ == slot_->version() && cv)
            cv->addReference();
    }
 
 
    ~PoolSlotRef() {
        if(slot_) {
            ConVar *cv = slot_->conVar();
            if (cv && version_ == slot_->version())
                cv->removeReference();
        }
    }
 
 
    friend std::ostream &operator<< <> (std::ostream &out, const PoolSlotRef<BaseType, CoType> &slot);
 
 
    BaseType *conVar() const {
        if(version_ == slot_->version())
            return slot_->conVar();
        printDifferentVersionError();
 
        return nullptr;
    }
 
    unsigned long version() const { return version_; }
 
    PoolSlot<BaseType, CoType> *slot() const { return slot_; }
 
 
 
    void slot(PoolSlot<BaseType, CoType> *s);
 
private:
 
    Master *master_; 
 
    PoolSlot<BaseType, CoType> *slot_; 
 
    unsigned long version_;
 
    void printDifferentVersionError() const;
 
 
    const PoolSlotRef<BaseType, CoType>
        &operator=(const PoolSlotRef<BaseType, CoType> &rhs);
 
    OGDF_NEW_DELETE
};
 
}
 
#include <ogdf/lib/abacus/poolslotref.inc>