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  1. #include <map>
  2. #include <iostream>
  3.  
  4. int main(int argc, char* argv[]) 
  5. {
  6. 	std::map<int, int&> m;
  7. 	int x = 0;
  8.  
  9. 	//m[0] = x;	//error
  10. 	m.insert(std::pair<int, int&>(0, x));
  11.  
  12. 	//ちゃんと参照を保持している
  13. 	x++;
  14. 	std::cout << m[0] << std::endl;
  15.  
  16.  
  17. 	return 0;
  18. }
Success #stdin #stdout 0.02s 2860KB
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stdin 
Standard input is empty
stdout 
1
https://ideone.com/6cVAy
language:
C++ (gcc 8.3)
created:
11 years ago
visibility:
public

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