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Geometry/GEMGeometryBuilder/src/GEMGeometryBuilderFromDDD.cc const-cast fix #25913

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merged 3 commits into from Feb 19, 2019
Merged

Geometry/GEMGeometryBuilder/src/GEMGeometryBuilderFromDDD.cc const-cast fix #25913

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0a76102
Store constructed superchambers in a vector to avoid const_cast
watson-ij Feb 12, 2019
dc8d1ff
Delete overlapping identifier
watson-ij Feb 12, 2019
23ab7bd
Add superchamber after adding chambers, to avoid having to change the…
watson-ij Feb 13, 2019
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8 changes: 4 additions & 4 deletions Geometry/GEMGeometryBuilder/src/GEMGeometryBuilderFromDDD.cc
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Expand Up @@ -49,6 +49,7 @@ GEMGeometryBuilderFromDDD::build( GEMGeometry& theGeometry,
bool doSuper = fv.firstChild();
LogDebug("GEMGeometryBuilderFromDDD") << "doSuperChamber = " << doSuper;
// loop over superchambers
std::vector<GEMSuperChamber*> superChambers;
while (doSuper){

// getting chamber id from eta partitions
Expand All @@ -66,6 +67,7 @@ GEMGeometryBuilderFromDDD::build( GEMGeometry& theGeometry,
if (detIdCh.layer() == 1){// only make superChambers when doing layer 1
GEMSuperChamber *gemSuperChamber = buildSuperChamber(fv, detIdCh);
theGeometry.add(gemSuperChamber);
superChambers.push_back(gemSuperChamber);
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It's a big dodgy to keep a list of writeable pointers after adding the super chambers to theGeometry. This technique works now, but future developers of the GEMGeometry class might assume that the GemSuperChamber objects stored in GEMGeometry cannot change since there is no interface that allows modification.
Perhaps the super chambers shouldn't be added to the GEMGeometry until after they are complete, but such an approach might have some side effects caused by changing the order of the objects stored in the GEMGeometry object.
Or a new method could be added to GEMGeometry:
const std::vector<GEMSuperChamber*>& GEMGeometry::superChambersWriteable();
to clearly allow writing to super chambers after they have been added.
This PR can go in as-is, but it would be good to consider whether this special pointer list is really the best approach.

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Okay, that's a good point. If we move this to after adding to the ring, we can avoid changing the superchambers after adding to theGeometry. I think the ordering should only make a difference in the GEMRing, but this isn't affected by this change.

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Adding the super chambers to theGeometry after they are modifed makes more sense. As long as there is no side effect from changing the order that the eta parts, GEM chambers, and super chambers are added, this approach is better.

}
GEMChamber *gemChamber = buildChamber(fv, detIdCh);

Expand Down Expand Up @@ -102,8 +104,7 @@ GEMGeometryBuilderFromDDD::build( GEMGeometry& theGeometry,
if (!loopExecuted) delete gemChamber;
}

auto& superChambers(theGeometry.superChambers());
// construct the regions, stations and rings.
// construct the regions, stations and rings.
for (int re = -1; re <= 1; re = re+2) {
GEMRegion* region = new GEMRegion(re);
for (int st=1; st<=GEMDetId::maxStationId; ++st) {
Expand All @@ -113,8 +114,7 @@ GEMGeometryBuilderFromDDD::build( GEMGeometry& theGeometry,
station->setName(name);
for (int ri=1; ri<=1; ++ri) {
GEMRing* ring = new GEMRing(re, st, ri);
for (auto sch : superChambers){
GEMSuperChamber* superChamber = const_cast<GEMSuperChamber*>(sch);
for (auto superChamber : superChambers){
const GEMDetId detId(superChamber->id());
if (detId.region() != re || detId.station() != st || detId.ring() != ri) continue;

Expand Down