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  1.  
  2. #include <type_traits>
  3. #include <iostream>
  4.  
  5.  
  6. struct some{};
  7.  
  8.  
  9. const some foo() { some s; return s; }
  10.  
  11. int main()
  12. {
  13.     std::cout << "Hello, world!\n";
  14.  
  15.  
  16.     if (std::is_const< decltype(foo() )  >::value)
  17.         std::cout << "returned const type\n";
  18.     else
  19.         std::cout << "returned non const type\n";
  20. }
Success #stdin #stdout 0s 3456KB
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Standard input is empty
stdout
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Hello, world!
returned const type
https://ideone.com/zcTmVV
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
public

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