std::get(std::complex)
Defined in header <complex> | ||
|---|---|---|
template< std::size_t I > friend constexpr T& get( std::complex<T>& x ); | (1) | (since C++26) |
template< std::size_t I > friend constexpr const T& get( const std::complex<T>& x ); | (2) | (since C++26) |
template< std::size_t I > friend constexpr T&& get( std::complex<T>&& x ); | (3) | (since C++26) |
template< std::size_t I > friend constexpr const T&& get( const std::complex<T>&& x ); | (4) | (since C++26) |
Returns the reference to real or imaginary part from a complex when I == 0 or I == 1, respectively. It is mainly provided for structured binding support.
Parameters
| x | - | a complex |
Return value
1-4) A reference to the real or imaginary part from the stored one when
I == 0 or I == 1, respectively.Notes
| Feature-test macro | Value | Std | Feature |
|---|---|---|---|
__cpp_lib_tuple_like | 202311L | (C++26) | Add tuple protocol to std::complex |
Example
#include <complex>
static_assert([z = std::complex(1.0, 2.0)]
{
#if __cpp_lib_tuple_like >= 202311L
return std::get<0>(z) == 1.0 and std::get<1>(z) == 2.0;
#else
return z.real() == 1.0 and z.imag() == 2.0;
#endif
}());
int main() {}
See also
| Structured binding (C++17) | binds the specified names to sub-objects or tuple elements of the initializer |
|
(C++11) | tuple accesses specified element (function template) |
|
(C++11) | accesses an element of a pair (function template) |
|
(C++11) | accesses an element of an array (function template) |
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