std::conj(std::complex)

Since C++20

Header: <complex>

  1. Computes the complex conjugate of z by reversing the sign of the imaginary part.

# Declarations

template< class T >
std::complex<T> conj( const std::complex<T>& z );

(until C++20)

template< class T >
constexpr std::complex<T> conj( const std::complex<T>& z );

(since C++20)

Additional overloads (since C++11)

std::complex<float> conj( float f );
std::complex<double> conj( double f );
std::complex<long double> conj( long double f );

(until C++20)

constexpr std::complex<float> conj( float f );
constexpr std::complex<double> conj( double f );
constexpr std::complex<long double> conj( long double f );

(since C++20) (until C++23)

template< class FloatingPoint >
constexpr std::complex<FloatingPoint> conj( FloatingPoint f );

(since C++23)

template< class Integer >
constexpr std::complex<double> conj( Integer i );

(until C++20)

template< class Integer >
constexpr std::complex<double> conj( Integer i );

(since C++20)

# Parameters

# Notes

The additional overloads are not required to be provided exactly as (A,B). They only need to be sufficient to ensure that for their argument num:

# Example

#include <complex>
#include <iostream>
 
int main()
{
    std::complex<double> z(1.0, 2.0);
    std::cout << "The conjugate of " << z << " is " << std::conj(z) << '\n'
              << "Their product is " << z * std::conj(z) << '\n';
}

# See also