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std::map::rend() returning first element of array, not element before

I’m trying to reverse iterate through a std::map, following this code: http://www.cplusplus.com/reference/stl/map/rend/ It says:

rend() returns a reverse iterator referring to the element right before the first element in the map container, which is considered its reverse end.

Notice that rend does not refer to the same element as begin, but to the element right before it.

map m;…