std::complex<T>::imag
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primary template std::complex <T>
(1)
T imag() const;
(until C++14)
constexpr T imag() const;
(since C++14)
(2)
void imag( T value );
(until C++20)
constexpr void imag( T value );
(since C++20)
specialization std::complex <float>
(1)
float imag() const;
(until C++11)
constexpr float imag() const;
(since C++11)
(2)
void imag( float value );
(until C++20)
constexpr void imag( float value );
(since C++20)
specialization std::complex <double>
(1)
double imag() const;
(until C++11)
constexpr double imag() const;
(since C++11)
(2)
void imag( double value );
(until C++20)
constexpr void imag( double value );
(since C++20)
specialization std::complex <long double>
(1)
long double imag() const;
(until C++11)
constexpr long double imag() const;
(since C++11)
(2)
void imag( long double value );
(until C++20)
constexpr void imag( long double value );
(since C++20)
Accesses the imaginary part of the complex number.
1) Returns the imaginary part.
2) Sets the imaginary part to value.
[edit] Parameters
value
-
the value to set the imaginary part to
[edit] Return value
1) The imaginary part of *this.
2) (none)
[edit] Notes
In C++11, overload (1) in std::complex specializations used to be specified without const qualifier. However, in C++11, a constexpr specifier used in a non-static member function implies const, and thus the behavior is as if const is specified.
[edit] Defect reports
The following behavior-changing defect reports were applied retroactively to previously published C++ standards.
| DR | Applied to | Behavior as published | Correct behavior |
|---|---|---|---|
| LWG 387 | C++98 | the imaginary part could not be set directly | can be set directly via a new imag overload
|