pricer.h

#include <objscip/objscip.h>
#include "graph.h"

using namespace scip;

class SegmentPricer : public ObjPricer
{
public:
    SegmentPricer(
        SCIP* scip, 
        Graph& g_, 
        std::vector<Graph::vertex_descriptor> master_nodes, 
        std::vector<SCIP_CONS*> partitioning_cons, 
        SCIP_CONS* num_segments_cons
        );

    SCIP_DECL_PRICERINIT(scip_init); 

    SCIP_RETCODE setupVars(SCIP* scip_pricer, Graph::vertex_descriptor t);

    virtual SCIP_DECL_PRICERREDCOST(scip_redcost);
    
    std::pair<SCIP_Real, std::vector<Graph::vertex_descriptor>> heuristic(
        SCIP* scip,
        Graph::vertex_descriptor master_node,
        SCIP_Real lambda
        );

    SCIP_RETCODE addPartitionVarFromPricerSCIP(SCIP* scip, SCIP* scip_pricer, SCIP_SOL* sol, Graph::vertex_descriptor t);
    
    SCIP_RETCODE addPartitionVar(SCIP* scip, Graph::vertex_descriptor master_node, std::vector<Graph::vertex_descriptor> superpixels);

private:
    Graph& g;
    std::vector<Graph::vertex_descriptor> master_nodes;
    std::vector<SCIP_CONS*> partitioning_cons;
    SCIP_CONS* num_segments_cons;

    // pricing problem data
    std::vector<SCIP*> scip_pricers; // k instances (one for each t in T)
    int _bigM;
    int _n;

    class PricerData : public ObjProbData
    {
    public:
        PricerData() : ObjProbData()
        {}

        std::vector<SCIP_VAR*> x; 
    };
};