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- void _void_f(){}
- template<typename T, typename ENABLE = void>
- struct is_constructible_default {
- static const bool value = false;
- };
- template<typename T>
- struct is_constructible_default<T, typename std::enable_if<std::is_same<decltype((T()), _void_f()),void>::value>::type> {
- static const bool value = true;
- }
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