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      std::complex<T>::operator+(unary), operator-(unary)

      From cppreference.com
      <cpp‎ |numeric‎ |complex
       
       
       
       
      (1)
      template<class T>
      std::complex<T> operator+(conststd::complex<T>& val);
      		(until C++20)
      template<class T>
      constexprstd::complex<T> operator+(conststd::complex<T>& val);
      		(since C++20)
      (2)
      template<class T>
      std::complex<T> operator-(conststd::complex<T>& val);
      		(until C++20)
      template<class T>
      constexprstd::complex<T> operator-(conststd::complex<T>& val);
      		(since C++20)

      Implements the analogs of the unary arithmetic operators for complex numbers.

      1) Returns the value of its argument
      2) Negates the argument

      [edit]Parameters

      val - the complex number argument

      [edit]Return value

      1) a copy of the argument,std::complex<T>(val)
      2) negated argument,std::complex<T>(-val.real(),-val.imag())

      [edit]See also

      performs complex number arithmetic on two complex values or a complex and a scalar
      (function template)[edit]
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