block.h

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#pragma once
 
#include <vector>
#include <iostream>
struct Variable;
struct Constraint;
 
class Block
{
        friend std::ostream& operator <<(std::ostream &os,const Block &b);
public:
        std::vector<Variable*> vars;
        double posn;
        double weight;
        double wposn;
        Block(Variable *v=nullptr);
        Block(const Block &) = delete;
        Constraint* findMinLM();
        Constraint* findMinLMBetween(Variable* lv, Variable* rv);
        Constraint* findMinInConstraint();
        Constraint* findMinOutConstraint();
        void deleteMinInConstraint();
        void deleteMinOutConstraint();
        double desiredWeightedPosition();
        void merge(Block *b, Constraint *c, double dist);
        void merge(Block *b, Constraint *c);
        void mergeIn(Block *b);
        void mergeOut(Block *b);
        void split(Block *&l, Block *&r, Constraint *c);
        Constraint* splitBetween(Variable* vl, Variable* vr, Block* &lb, Block* &rb);
        void setUpInConstraints();
        void setUpOutConstraints();
        double cost();
        bool deleted;
        long timeStamp;
        std::vector<Constraint *> in;
        std::vector<Constraint *> out;
private:
        typedef enum {NONE, LEFT, RIGHT} Direction;
        typedef std::pair<double, Constraint*> Pair;
        void reset_active_lm(Variable *v, Variable *u);
        double compute_dfdv(Variable *v, Variable *u, Constraint *&min_lm);
        Pair compute_dfdv_between(
                        Variable*, Variable*, Variable*, Direction, bool);
        bool canFollowLeft(const Constraint *c, const Variable *last);
        bool canFollowRight(const Constraint *c, const Variable *last);
        void populateSplitBlock(Block *b, Variable *v, Variable *u);
        void addVariable(Variable *v);
        std::vector<Constraint *> setUpConstraintHeap(bool use_in);
};