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  1. #include <iostream>
  2. #include <initializer_list>
  3. using namespace std;
  4.  
  5. struct InitListConstructible {
  6. 	InitListConstructible() = default;
  7.  
  8.     InitListConstructible(std::initializer_list<int> elems) {
  9.     	// do something
  10.     }
  11. };
  12.  
  13. InitListConstructible operator+ (InitListConstructible lhs,
  14.                                  InitListConstructible rhs) {
  15.     return {};                                 	
  16. }
  17.  
  18. void freeFunction(InitListConstructible lhs, InitListConstructible rhs) {
  19. 	// Do nothing
  20. }
  21.  
  22. int main() {
  23. 	/* Totally fine - use initializer list constructor. */
  24. 	InitListConstructible lhs = { 1, 2, 3 };
  25.  
  26. 	/* Totally fine - use overloaded + operator. */
  27. 	auto legit = lhs + lhs;
  28.  
  29. 	/* Totally fine - second argument constructed from initializer list. */
  30. 	freeFunction(lhs, { 1, 2, 3 });
  31.  
  32. 	/* Totally fine - explicit call to operator+. */
  33. 	auto alsoLegit = operator+ (lhs, { 1, 2, 3 });
  34.  
  35. 	/* Not okay - reports error about expected primary-expression. */
  36. 	auto error = lhs + { 1, 2, 3 };
  37.  
  38. 	return 0;
  39. }
Compilation error #stdin compilation error #stdout 0s 0KB
comments (?)
stdin
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Standard input is empty
compilation info 
prog.cpp: In function ‘int main()’:
prog.cpp:36:21: error: expected primary-expression before ‘{’ token
  auto error = lhs + { 1, 2, 3 };
                     ^
stdout
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Standard output is empty
https://ideone.com/X1eXPM
language:
C++14 (gcc 8.3)
created:
7 years ago
visibility:
public

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