in FBRetainCycleDetector/Associations/FBAssociationManager.mm [63:76]
void _threadUnsafeRemoveAssociations(id object) {
if (_associationMap->size() == 0 ){
return;
}
auto i = _associationMap->find(object);
if (i == _associationMap->end()) {
return;
}
auto *refs = i->second;
delete refs;
_associationMap->erase(i);
}