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template <class T, T val> struct integral_constant { typedef integral_constant<T, val> type; typedef T value_type; static const T value = val; constexpr operator T()const; }; typedef integral_constant<bool, true> true_type; typedef integral_constant<bool, false> false_type;
        Class template integral_constant
        is the common base class for all the value-based type traits. The two typedef's
        true_type and false_type are provided for convenience:
        most of the value traits are Boolean properties and so will inherit from
        one of these.