29 Numerics library [numerics]

29.4 Complex numbers [complex.numbers]

29.4.9 Tuple interface [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; };
1
#
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;
2
#
Mandates: I < 2 is true.
3
#
Returns: A reference to the real part of z if I == 0 is true, otherwise a reference to the imaginary part of z.