std::imag(std::complex)
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std::complex
(until C++20)
(C++26)
(C++26)
(C++26)
Defined in header
<complex>
(1)
template< class T >
T imag( const std::complex <T>& z );
(until C++14)
T imag( const std::complex <T>& z );
template< class T >
constexpr T imag( const std::complex <T>& z );
(since C++14)
constexpr T imag( const std::complex <T>& z );
Additional overloads (since C++11)
Defined in header
<complex>
(A)
float imag( float f );
(until C++14)
double imag( double f );
constexpr float imag( float f );
(since C++14) constexpr double imag( double f );
(until C++23)
template< class FloatingPoint >
FloatingPoint imag( FloatingPoint f );
(since C++23)
FloatingPoint imag( FloatingPoint f );
(B)
template< class Integer >
double imag( Integer i );
(until C++14)
double imag( Integer i );
template< class Integer >
constexpr double imag( Integer i );
(since C++14)
constexpr double imag( Integer i );
1) Returns the imaginary part of the complex number z, i.e. z.imag().
A,B) Additional overloads are provided for all integer and floating-point types, which are treated as complex numbers with zero imaginary part.
(since C++11)Contents
[edit] Parameters
z
-
complex value
f
-
floating-point value
i
-
integer value
[edit] Return value
1) The imaginary part of z.
A) decltype(f){} (zero).
B) 0.0.
[edit] 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::imag(num) has the same effect as std::imag(std::complex <T>(num)). - Otherwise, if num has an integer type, then std::imag(num) has the same effect as std::imag(std::complex <double>(num)).
[edit] See also
C documentation for cimag