const ESM::Cell *searchExt (int x, int y) const { ExtCells::const_iterator it = extCells.find (std::make_pair (x, y)); if (it==extCells.end()) return 0; return it->second; }
const Cell *searchExt (int x, int y) const { ExtCells::const_iterator it = extCells.find (x); if (it==extCells.end()) return 0; ExtCellsCol::const_iterator it2 = it->second.find (y); if (it2 == it->second.end()) return 0; return it2->second; }