std::tuple_element<std::complex>
From cppreference.com
| Defined in header <complex>
|
||
| template< std::size_t I, class T > struct tuple_element<I, std::complex<T>>; |
(since C++26) | |
The partial specializations of std::tuple_element for std::complex provide compile-time access to the underlying real and imaginary number type of a complex, using tuple-like syntax. They are provided for structured binding support. The program is ill-formed if I >= 2.
Contents |
[edit] Member types
| Member type | Definition |
type
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T
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[edit] Notes
| Feature-test macro | Value | Std | Feature |
|---|---|---|---|
__cpp_lib_tuple_like |
202311L |
(C++26) | Add tuple protocol to std::complex |
[edit] Example
Run this code
#include <complex> #include <type_traits> static_assert([z = std::complex<float>()] { using T = decltype(z); return #if __cpp_lib_tuple_like >= 202311L std::is_same_v<std::tuple_element_t<0, T>, float> && std::is_same_v<std::tuple_element_t<1, T>, float> && #endif std::is_same_v<T::value_type, float>; }()); int main() {}
[edit] See also
| Structured binding (C++17) | binds the specified names to sub-objects or tuple elements of the initializer |
| (C++11) |
obtains the element types of a tuple-like type (class template) |
| obtains the size of a std::complex (class template specialization) | |
| (C++26) |
obtains a reference to real or imaginary part from a std::complex (function template) |
