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Showing content from https://timsong-cpp.github.io/cppwp/n4659/complex below:

[complex]

29 Numerics library [numerics] 29.5 Complex numbers [complex.numbers] 29.5.2 Class template complex [complex]
namespace std {
  template<class T>
  class complex {
  public:
    using value_type = T;

    constexpr complex(const T& re = T(), const T& im = T());
    constexpr complex(const complex&);
    template<class X> constexpr complex(const complex<X>&);

    constexpr T real() const;
    void real(T);
    constexpr T imag() const;
    void imag(T);

    complex<T>& operator= (const T&);
    complex<T>& operator+=(const T&);
    complex<T>& operator-=(const T&);
    complex<T>& operator*=(const T&);
    complex<T>& operator/=(const T&);

    complex& operator=(const complex&);
    template<class X> complex<T>& operator= (const complex<X>&);
    template<class X> complex<T>& operator+=(const complex<X>&);
    template<class X> complex<T>& operator-=(const complex<X>&);
    template<class X> complex<T>& operator*=(const complex<X>&);
    template<class X> complex<T>& operator/=(const complex<X>&);
  };
}

The class complex describes an object that can store the Cartesian components, real() and imag(), of a complex number.


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