Comparing Objectivity and Versant: Predicates

Char pred[130];

sigma3 = 3.0*star_iterator1->_sigma();

xlow = star_iterator1->_x() - sigma3;

xhigh = xlow + 2.*sigma3;

ylow = star_iterator1->_y() - sigma3;

yhigh = ylow + 2.*sigma3;

(void) sprintf(pred,"xcentre>%f && xcentre<%f && ycentre>%f && ycentre<%f",xlow,xhigh,ylow,yhigh);

if(star_iterator2.scan(cHandle2,oocRead,oocAll,pred)) {

dmax = 0.0;

nearest = -1;

while (star_iterator2.next()) {

x = star_iterator2->_x();

y = star_iterator2->_y();

d = star_iterator1->(x,y);

if (d>) {

dmax = d;

nearest = star_iterator2->_catalogue();

}

}

}

PPredicate pred;

sigma3 = 3.0*a[i]->_sigma();

xlow = a[i]->_x() - sigma3;

xhigh = xlow + 2.*sigma3;

ylow = a[i]->_y() - sigma3;

yhigh = ylow + 2.*sigma3;

pred = PAttribute("Star::xcentre") > xlow &&

PAttribute("Star::xcentre") < xhigh &&

PAttribute("Star::ycentre") > ylow &&

PAttribute("Star::ycentre") < yhigh;

LinkVstr<> b =

PClassObject<>::Object().select("starsdb2",FALSE,pred);

dmax = 0.0;

nearest = -1;

for(j=0;j<.size();j++) {

x = b[j]->_x();

y = b[j]->_y();

d = a[i]->(x,y);

if(d>) {

dmax = d;

nearest = b[j]->_catalogue();

}

}

• The Versant predicate is not the same as an Obvjectivity predicate

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