29 Numerics library [numerics]

29.4 Complex numbers [complex.numbers]

29.4.4 Member functions [complex.members]

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constexpr complex(const T& re = T(), const T& im = T());
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Postconditions: real() == re && imag() == im is true.
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template<class X> constexpr explicit(see below) complex(const complex<X>& other);
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Effects: Initializes the real part with other.real() and the imaginary part with other.imag().
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Remarks: The expression inside explicit evaluates to false if and only if the floating-point conversion rank of T is greater than or equal to the floating-point conversion rank of X.
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constexpr T real() const;
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Returns: The value of the real component.
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constexpr void real(T val);
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Effects: Assigns val to the real component.
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constexpr T imag() const;
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Returns: The value of the imaginary component.
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constexpr void imag(T val);
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Effects: Assigns val to the imaginary component.