//demo classes
#include <iostream>
#include <string>
class demo {
public:
    std::string data;
    demo() : data("LONG STRING SO NO CHEATS") {std::cout<<"default construct\n";}
    demo(const demo& rhs) : data(rhs.data) {std::cout<<"copy construct\n";}
    demo& operator=(const demo& rhs) {data = rhs.data; std::cout<<"copy assignment\n"; return *this;}
    void prove() const {std::cout<<((void*)(data.c_str()))<<' '<<data.c_str()<<'\n';}
};
 
 
 
//test suite
int main() {
   demo a;
   a.prove();   
   demo b = a;
   a.prove();  
   b.prove();    
}
 

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