std::conj(std::complex)
From cppreference.com
Defined in header <complex>
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| (1) | ||
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template
<
class T >
std::complex <T> conj( const std::complex <T> & z ) ; |
(until C++20) | |
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template
<
class T >
constexpr std::complex <T> conj( const std::complex <T> & z ) ; |
(since C++20) | |
Additional overloads (since C++11) |
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Defined in header <complex>
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| (A) | ||
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std::complex
<
float
> conj(
float f )
;
std::complex
<
double
> conj(
double f )
;
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(until C++20) | |
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constexpr
std::complex
<
float
> conj(
float f )
;
constexpr
std::complex
<
double
> conj(
double f )
;
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(since C++20) (until C++23) |
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template
<
class FloatingPoint >
constexpr std::complex <FloatingPoint> conj( FloatingPoint f ) ; |
(since C++23) | |
| (B) | ||
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template
<
class Integer >
constexpr std::complex < double > conj( Integer i ) ; |
(until C++20) | |
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template
<
class Integer >
constexpr std::complex < double > conj( Integer i ) ; |
(since C++20) | |
A,B) Additional overloads are provided for all integer and floating-point types, which are treated as complex numbers with zero imaginary component.
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(since C++11) |
Parameters
| z | - | complex value |
| f | - | floating-point value |
| i | - | integer value |
Return value
1) The complex conjugate of z.
A)
std::complex(f)
B)
std::complex
<
double
>
(i)
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:
- If num has a standard(until C++23) floating-point type
T, then std::conj(num) has the same effect as std:: conj ( std::complex <T> (num) ) - Otherwise, if num has an integer type, then std::conj(num) has the same effect as std:: conj ( std::complex < double > (num) )
Example
Run this code
#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'; }
Output:
The conjugate of (1,2) is (1,-2) Their product is (5,0)
See also
| returns the magnitude of a complex number (function template) |
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| returns the squared magnitude (function template) |
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| constructs a complex number from magnitude and phase angle (function template) |
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C documentation for conj
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