std::real(std::complex)
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Defined in header
<complex> |
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| (1) | ||
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template< class T >
T real( const std::complex<T>& z ); |
(until C++14) | |
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template< class T >
constexpr T real( const std::complex<T>& z ); |
(since C++14) | |
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Additional overloads (since C++11)
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Defined in header
<complex> |
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| (A) | ||
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float real( float f );
double real( double f ); |
(until C++14) | |
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constexpr float real( float f );
constexpr double real( double f ); |
(since C++14) (until C++23) |
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template< class FloatingPoint >
constexpr FloatingPoint real( FloatingPoint f ); |
(since C++23) | |
| (B) | ||
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template< class Integer >
double real( Integer i ); |
(until C++14) | |
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template< class Integer >
constexpr double real( Integer i ); |
(since C++14) | |
1) Returns the real part of the complex number z, i.e. z.real().
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A,B) Additional overloads are provided for all integer and floating-point types, which are treated as complex numbers with zero imaginary part.
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(since C++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 C++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) |
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| returns the imaginary part (function template) |