[simd.complex.access]

constexpr real-type real() const noexcept;
constexpr real-type imag() const noexcept;

Returns: An object of type real-type where the

{i th element is initialized to the result of cmplx-func (​ operator [] (i) for all i in the range [0, size ()), where cmplx-func is the corresponding function from <complex> .}^{th element is initialized to the result of cmplx-func (​ operator [] (i) for all i in the range [0, size ()), where cmplx-func is the corresponding function from <complex> .}

constexpr void real(const real-type& v) noexcept;
constexpr void imag(const real-type& v) noexcept;

Effects: Replaces each element of the basic_vec object such that the

{i th element is replaced with value_type (v [i], operator [] (i) . imag () or value_type (operator [] (i) . real (), v [i]) for real and imag respectively, for all i in the range [0, size ()) .}^{th element is replaced with value_type (v [i], operator [] (i) . imag () or value_type (operator [] (i) . real (), v [i]) for real and imag respectively, for all i in the range [0, size ()) .}

29 Numerics library [numerics]