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  1. #include <iostream>
  2.  
  3. struct A {};
  4.  
  5. struct B {
  6.     static const char* message;
  7. };
  8. const char* B::message = "Hello, world!";
  9.  
  10. template <typename T>
  11. void PrintMessage(...) {}
  12.  
  13. template <typename T>
  14. void PrintMessage(decltype(&T::message)) {
  15.     std::cout << T::message << std::endl;
  16. }
  17.  
  18. int main() {
  19.     PrintMessage<A>(nullptr);
  20.     PrintMessage<B>(nullptr);
  21.     return 0;
  22. }
Success #stdin #stdout 0s 4396KB
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stdin
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Standard input is empty
stdout
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Hello, world!
https://ideone.com/sVP6AY
language:
C++ (gcc 8.3)
created:
5 years ago
visibility:
public

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