std::complex<T>:: real

primary template std:: complex < T >
	(1)
T real ( ) const ;			(until C++14)
constexpr T real ( ) const ;			(since C++14)
		(2)
void real ( T value ) ;				(until C++20)
constexpr void real ( T value ) ;				(since C++20)
specialization std:: complex < float >
			(1)
float real ( ) const ;					(until C++11)
constexpr float real ( ) const ;					(since C++11)
				(2)
void real ( float value ) ;						(until C++20)
constexpr void real ( float value ) ;						(since C++20)
specialization std:: complex < double >
					(1)
double real ( ) const ;							(until C++11)
constexpr double real ( ) const ;							(since C++11)
						(2)
void real ( double value ) ;								(until C++20)
constexpr void real ( double value ) ;								(since C++20)
specialization std:: complex < long double >
							(1)
long double real ( ) const ;									(until C++11)
constexpr long double real ( ) const ;									(since C++11)
								(2)
void real ( long double value ) ;										(until C++20)
constexpr void real ( long double value ) ;										(since C++20)

Accesses the real part of the complex number.

Parameters

value

-

the value to set the real part to

Return value

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.

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 real part could not be set directly	can be set directly via a new real overload

See also

real	returns the real part (function template)
imag	accesses the imaginary part of the complex number (public member function)