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@robinhuang, Marking the key as const isn't really needed. It can't be modified via map's public interface anyway.
I guess if map implementation uses assignment operator internally, then passing a constant key to it will not work. Maybe older implementation was using a copy constructor.
UPD:
> >>From the C++ standard:
> >> Table 69 in 23.1.2, p7, says that
> >> X::key_type must be assignable;
