#include <iostream>
#include <string>
class Beispiel {
public:
Beispiel(std::string &str) { mStr = &str; }
void tueWasMitString() { *mStr += "AAA"; }
private:
std::string *mStr;
};
int main() {
std::string test = "BBB";
Beispiel b(test);
b.tueWasMitString();
std::cout << test; // soll "BBBAAA"
}
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