std::real(std::complex)

 

C++

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Named requirements

Language support library

Concepts library (C++20)

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Strings library

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Algorithms library

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Input/output library

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Regular expressions library (C++11)

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Technical Specifications

 

Numerics library

Common mathematical functions

Special mathematical functions

Floating-point environment (C++11)

Complex numbers

Numeric arrays

Pseudo-random number generation

Compile-time rational arithmetic (C++11)

Numeric algorithms

gcd (C++17)

lcm (C++17)

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midpoint (C++20)

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iota (C++11)

accumulate

inner_product

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reduce (C++17)

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inclusive_scan (C++17)

exclusive_scan (C++17)

transform_inclusive_scan (C++17)

transform_exclusive_scan (C++17)

Bit operations

bit_cast (C++20)

ispow2 (C++20)

ceil2 (C++20)

floor2 (C++20)

log2p1 (C++20)

 

std::complex

Member functions
complex::complex
complex::operator=
complex::real
complex::imag
complex::operator+=complex::operator-=complex::operator*=complex::operator/=
Non-member functions
operator+operator- operator+operator-operator*operator/ operator==operator!= operator<<operator>>	real imag abs arg norm conj proj (C++11) polar operator""ioperator""ifoperator""il (C++14)(C++14)(C++14)
Exponential functions
exp
log
log10
Power functions
pow
sqrt
Trigonometric functions
sin cos tan	asin (C++11) acos (C++11) atan (C++11)
Hyperbolic functions
sinh cosh tanh	asinh (C++11) acosh (C++11) atanh (C++11)

 

Defined in header <complex>
	(1)
template< class T > T real( const std::complex<T>& z );			(until C++14)
template< class T > constexpr T real( const std::complex<T>& z );			(since C++14)
		(2)
float real( float z ); template< class DoubleOrInteger > double real( DoubleOrInteger z ); long double real( long double z );				(since C++11) (until C++14)
constexpr float real( float z ); template< class DoubleOrInteger > constexpr double real( DoubleOrInteger z ); constexpr long double real( long double z );				(since C++14)

1) Returns the real component of the complex number z, i.e. z.real().

2) Additional overloads are provided for float, double, long double, and all integer types, which are treated as complex numbers with zero imaginary component.

(since C++11)

Parameters

z

-

complex value

Return value

the real component of z

See also

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