distance_progress_sink.h

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#pragma once
 
#include <QString>
 
class IDistanceProgressSink
{
public:
    virtual ~IDistanceProgressSink() = default;
 
    virtual void statusMessage(const QString &msg) = 0;
    virtual void resetCancellation() = 0;
    virtual bool progressCanceled() const = 0;
 
    // Called once by DistanceEngine when it detects a negative edge weight and refuses to run
    // Dijkstra (mathematically undefined for negative weights) - see #277/WS18 P1.
    virtual void reportNegativeWeights() = 0;
};