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  1. #include <iostream>
  2. #include <initializer_list>
  3. using namespace std;
  4.  
  5. struct AddInitializerList {
  6. 	void operator+= (initializer_list<int> values) {
  7. 		// Do nothing	
  8. 	}
  9.  
  10. 	void operator+ (initializer_list<int> values) {
  11. 		// Do nothing
  12. 	}
  13. };
  14.  
  15. template<class T> auto id(std::initializer_list<T> il) { return il;}
  16. template<class T> auto _ (std::initializer_list<T> il) { return il;}
  17.  
  18. template<class T> auto operator+(std::initializer_list<T> il) { return il; }
  19.  
  20. int main() {
  21. 	AddInitializerList adder;
  22. 	adder += {1, 2, 3};  // Totally legit
  23.  
  24. 	adder.operator+({1, 2, 3});  // okay!
  25. 	adder + id({1, 2, 3});
  26. 	adder +  _({1, 2, 3});
  27.  
  28. 	adder +  operator+({1, 2, 3});
  29.  
  30. 	adder +  {1, 2, 3};  // Not okay!
  31.  
  32. 	return 0;
  33. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
prog.cpp: In function ‘int main()’:
prog.cpp:30:11: error: expected primary-expression before ‘{’ token
  adder +  {1, 2, 3};  // Not okay!
           ^
stdout
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Standard output is empty
https://ideone.com/njqRcO
language:
C++14 (gcc 8.3)
created:
1 year ago
visibility:
public

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