The std::hash class should be

constexpr duration() = default; (1)

Functions Defined in header <ctime>

Defined in header

static constexpr T lowest()

template< class Y > operator auto_ptr_ref<Y>(); (1)

Defined in header

Defined in header

template<class T1, class D1, class T2, class D2> bool operator==(const

static T signaling_NaN();