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std::tuple_size<std::complex>

From cppreference.com
< cpp‎ | numeric‎ | complex
 
 
 
 
Defined in header <complex>
template< class T >

struct tuple_size<std::complex<T>>

    : std::integral_constant<std::size_t, 2> {};
(since C++26)

The partial specialization of std::tuple_size for std::complex provides a compile-time way to obtain the number of components of a complex, which is always 2, using tuple-like syntax. It is provided for structured binding support.

Contents

Inherited from std::integral_constant

Member constants

value
[static]
the constant value 2
(public static member constant)

Member functions

operator std::size_t
converts the object to std::size_t, returns value
(public member function)
operator()
(C++14)
returns value
(public member function)

Member types

Type Definition
value_type std::size_t
type std::integral_constant<std::size_t, value>

[edit] Example

#include <complex>
 
static_assert(std::tuple_size_v<std::complex<long long>> == 2);
 
int main() {}

[edit] See also

Structured binding (C++17) binds the specified names to sub-objects or tuple elements of the initializer[edit]
obtains the number of elements of a tuple-like type
(class template) [edit]
obtains the underlying real and imaginary number type of a std::complex
(class template specialization) [edit]