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SFINAE with std::enable_if
#include <iostream> template<typename T, typename Enable=void> struct has_member_value_as_true : std::false_type {}; template<typename T> struct has_member_value_as_true<T, std::enable_if_t<T::value>> : std::true_type {}; struct T { static constexpr bool value = true; }; struct F { static constexpr bool value = false; }; struct E {}; int main() { std::cout << has_member_value_as_true<T>::value << std::endl; std::cout << has_member_value_as_true<F>::value << std::endl; std::cout << has_member_value_as_true<E>::value << std::endl; }
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