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  1. #include <type_traits>
  2.  
  3. template <typename E>
  4. typename std::underlying_type<E>::type to_underlying(E e) {
  5.     return static_cast<typename std::underlying_type<E>::type>(e);
  6. }
  7.  
  8. using uint = unsigned;
  9. //enum class foo : unsigned { bar }; // works
  10. enum class foo : uint { bar }; // fails
  11.  
  12. void f(unsigned) {}
  13.  
  14. int main() {
  15.     f(to_underlying(foo::bar));
  16.     f(static_cast<std::underlying_type<foo>::type>(foo::bar));
  17. }
  18.  
  19.  
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https://ideone.com/3h1WF
language:
C++14 (gcc 8.3)
created:
12 years ago
visibility:
public

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