tmp/tmpaht1jfcp/{from.md → to.md}
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### Tuple interface <a id="complex.tuple">[[complex.tuple]]</a>
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``` cpp
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template<class T>
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struct tuple_size<complex<T>> : integral_constant<size_t, 2> {};
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template<size_t I, class T>
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struct tuple_element<I, complex<T>> {
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using type = T;
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};
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```
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*Mandates:* `I < 2` is `true`.
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``` cpp
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template<size_t I, class T>
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constexpr T& get(complex<T>& z) noexcept;
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template<size_t I, class T>
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constexpr T&& get(complex<T>&& z) noexcept;
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template<size_t I, class T>
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constexpr const T& get(const complex<T>& z) noexcept;
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template<size_t I, class T>
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constexpr const T&& get(const complex<T>&& z) noexcept;
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```
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*Mandates:* `I < 2` is `true`.
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*Returns:* A reference to the real part of `z` if `I == 0` is `true`,
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otherwise a reference to the imaginary part of `z`.
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