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Fixes compilation with gcc 4.7
array.h: In instantiation of ‘void ArrayStack::push(const T&) [with T = BPBox_]’:
array.h:372:32: required from ‘void ObjArrayStack::push(T_) [with T = BPBox]’
boxprint.cc:371:39: required from here
array.h:261:7: error: ‘setIndexDoubler’ was not declared in this scope, and no declarations were found by argument-dependent lookup at the point of instantiation [-fpermissive]
array.h:261:7: note: declarations in dependent base ‘GrowArray<BPBox*>’ are not found by unqualified lookup
array.h:261:7: note: use ‘this->setIndexDoubler’ instead