lst-0781-book.cpp
// https://godbolt.org/z/7E6cr8GE9
map<string,string> data { {"Hans","Albers"}, {"Heinz","Ruehmann" }, };
cout <<= data; // Hans:Albers Heinz:Ruehmann
data.rbegin()->second = "Erhardt"; // Ziel überschreiben
cout <<= data; // Hans:Albers Heinz:Erhardt