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  1.  
  2. template<typename T, typename... Ts>
  3. struct is_complete{
  4.   template<unsigned...> void foo();
  5.   template<typename... Us>
  6.   static auto test(int) -> decltype(foo<sizeof(Us)...>(), true_type{});
  7.   template<typename...>
  8.   static auto test(...) -> false_type;
  9.  
  10.   constexpr operator bool() { return decltype(test<T, Ts...>(0))(); }
  11. };
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https://ideone.com/KJJbcb
language:
C++ (gcc 8.3)
created:
12 years ago
visibility:
public

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