[complex.tuple]

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template<class T>
struct tuple_size<complex<T>> : integral_constant<size_t, 2> {};

template<size_t I, class T>
struct tuple_element<I, complex<T>> {
  using type = T;
};

Mandates: I < 2 is true.

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template<size_t I, class T>
  constexpr T& get(complex<T>& z) noexcept;
template<size_t I, class T>
  constexpr T&& get(complex<T>& z) noexcept;
template<size_t I, class T>
  constexpr const T& get(const complex<T>& z) noexcept;
template<size_t I, class T>
  constexpr const T&& get(const complex<T>& z) noexcept;

Returns: A reference to the real part of z if I == 0 is true, otherwise a reference to the imaginary part of z.

29 Numerics library [numerics]

29.4 Complex numbers [complex.numbers]

29.4.9 Tuple interface [complex.tuple]