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I can't find the utility of the second const in this part of c++ code, can someone explain please?

Author Votes Δ
Michael Krelin - hacker 6 +1.48
lvella 3 +1.43
Luchian Grigore 2 -0.28
Mahesh 0 -1.32
Last visited: Sep 14, 2014, 5:07:29 AM