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Note that both the do_analysis function and the railroad_car
class contain readily seen new–delete combinations.
Readily seen new–delete combinations is indicative of good
programming practice, because you can determine at a glance that memory
allocated by a new is eventually reclaimed by a delete.
Thus, you can determine at a glance that the new does not cause a
memory leak.
The lack of such pairing is considered extremely bad, because it makes memory management much more difficult.