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  1. #include <iostream>
  2. #include <map>
  3.  
  4. template<typename T, T def>
  5. struct DefaultInteger
  6. {
  7. 	DefaultInteger() : val(def) {}
  8. 	DefaultInteger(T val) : val(val) {}
  9.  
  10. 	DefaultInteger& operator=(T n) { val = n; return *this; }
  11. 	operator T() const { return val; }
  12.  
  13. 	T val;
  14. };
  15.  
  16.  
  17. int main()
  18. {
  19. 	using namespace std;
  20.  
  21. 	map<int,DefaultInteger<int,42>> m;
  22.  
  23. 	cout << m[-1] << endl;
  24. }
Success #stdin #stdout 0s 3428KB
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stdin
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Standard input is empty
stdout
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42
https://ideone.com/OtxVIw
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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