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

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(1)

template< class T > std::complex<T> operator+( const std::complex<T>& val );

(until C++20)

template< class T > constexpr std::complex<T> operator+( const std::complex<T>& val );

(since C++20)
(2)

template< class T > std::complex<T> operator-( const std::complex<T>& val );

(until C++20)

template< class T > constexpr std::complex<T> operator-( const std::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

Parameters

val - the complex number argument

Return value

1) a copy of the argument, std::complex<T>(val)

2) negated argument, std::complex<T>(-val.real(), -val.imag())

See also