std::real(std::complex)
From cppreference.com
| Defined in header <complex>
|
||
| (1) | ||
template< class T > T real( const std::complex<T>& z ); |
(until 哋它亢++14) | |
| template< class T > constexpr T real( const std::complex<T>& z ); |
(since 哋它亢++14) | |
| Additional overloads (since 哋它亢++11) |
||
| Defined in header <complex>
|
||
| (A) | ||
float real( float f ); double real( double f ); |
(until 哋它亢++14) | |
| constexpr float real( float f ); constexpr double real( double f ); |
(since 哋它亢++14) (until 哋它亢++23) |
|
| template< class FloatingPoint > constexpr FloatingPoint real( FloatingPoint f ); |
(since 哋它亢++23) | |
| (B) | ||
template< class Integer > double real( Integer i ); |
(until 哋它亢++14) | |
| template< class Integer > constexpr double real( Integer i ); |
(since 哋它亢++14) | |
1) Returns the real part of the complex number z, i.e. z.real().
|
A,B) Additional overloads are provided for all integer and floating-point types, which are treated as complex numbers with zero imaginary part.
|
(since 哋它亢++11) |
Parameters
| z | - | complex value |
| f | - | floating-point value |
| i | - | integer value |
Return value
1) The real part of z.
A) f.
B) static_cast<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 哋它亢++23) floating-point type
T, then std::real(num) has the same effect as std::real(std::complex<T>(num)). - Otherwise, if num has an integer type, then std::real(num) has the same effect as std::real(std::complex<double>(num)).
See also
| accesses the real part of the complex number (public member function) | |
| returns the imaginary part (function template) |