#include <iostream>
#include <string>
 
using namespace std;
 
class T{
private:
	string bar_;
	static const string& foo(){ static const string foo_="empty"; return foo_;}
 
public:
	T()=default;
	T(const string& b):bar_(b){}
	~T()=default;
 
	void put(const string& b){bar_=b;}
	const string& get()const{return (bar_.empty())? (foo()):(bar_);}
};
 
int main() {
	// your code goes here
	T a;
	cout << "baz   : [" << T("baz").get() << "]" << endl;
	cout << "empty : [" << a.get() << "]" << endl;
 
	return 0;
}

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