EXPLICIT constexpr tuple();
EXPLICIT constexpr tuple(const Types&...);
template <class... UTypes> EXPLICIT constexpr tuple(UTypes&&... u);
tuple(const tuple& u) = default;
tuple(tuple&& u) = default;
template <class... UTypes> EXPLICIT constexpr tuple(const tuple<UTypes...>& u);
template <class... UTypes> EXPLICIT constexpr tuple(tuple<UTypes...>&& u);
template <class U1, class U2> EXPLICIT constexpr tuple(const pair<U1, U2>& u);
template <class U1, class U2> EXPLICIT constexpr tuple(pair<U1, U2>&& u);
template <class Alloc>
tuple(allocator_arg_t, const Alloc& a);
template <class Alloc>
EXPLICIT tuple(allocator_arg_t, const Alloc& a, const Types&...);
template <class Alloc, class... UTypes>
EXPLICIT tuple(allocator_arg_t, const Alloc& a, UTypes&&...);
template <class Alloc>
tuple(allocator_arg_t, const Alloc& a, const tuple&);
template <class Alloc>
tuple(allocator_arg_t, const Alloc& a, tuple&&);
template <class Alloc, class... UTypes>
EXPLICIT tuple(allocator_arg_t, const Alloc& a, const tuple<UTypes...>&);
template <class Alloc, class... UTypes>
EXPLICIT tuple(allocator_arg_t, const Alloc& a, tuple<UTypes...>&&);
template <class Alloc, class U1, class U2>
EXPLICIT tuple(allocator_arg_t, const Alloc& a, const pair<U1, U2>&);
template <class Alloc, class U1, class U2>
EXPLICIT tuple(allocator_arg_t, const Alloc& a, pair<U1, U2>&&);