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  1. #include <type_traits>
  2.  
  3. struct Y{};
  4.  
  5. struct X{
  6.   bool operator()(Y const&);
  7.   long operator()(Y&&);
  8. };
  9.  
  10. Y const f();
  11.  
  12. int main(){
  13.   static_assert(std::is_same<std::result_of<X(Y const)>::type, bool>(), "/cry");
  14.  
  15.   X x;
  16.   using result_type = decltype(x(f()));
  17.   static_assert(std::is_same<result_type, bool>(), "/yay");
  18. }
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:13:3: error: static assertion failed: /cry
stdout
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Standard output is empty
https://ideone.com/as47EJ
language:
C++14 (gcc 8.3)
created:
11 years ago
visibility:
secret

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