constraint.h

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#pragma once
 
#include <iostream>
#include <vpsc/variable.h>
 
struct Constraint
{
        friend std::ostream& operator <<(std::ostream &os,const Constraint &c);
public:
        Variable *left;
        Variable *right;
        double gap;
        double lm;
        Constraint(Variable *left, Variable *right, double gap);
        ~Constraint();
        double slack() const { return right->position() - gap - left->position(); }
        long timeStamp;
        bool active;
        bool visited;
};
#include <float.h>
#include <vpsc/block.h>
static inline bool compareConstraints(Constraint *const &l, Constraint *const &r) {
        double const sl = 
                l->left->block->timeStamp > l->timeStamp
                ||l->left->block==l->right->block
                ?-DBL_MAX:l->slack();
        double const sr = 
                r->left->block->timeStamp > r->timeStamp
                ||r->left->block==r->right->block
                ?-DBL_MAX:r->slack();
        if(sl==sr) {
                // arbitrary choice based on id
                if(l->left->id==r->left->id) {
                        if(l->right->id<r->right->id) return true;
                        return false;
                }
                if(l->left->id<r->left->id) return true;
                return false;
        }
        return sl < sr;
}