std::tuple_size<std::array>
Defined in header <array> | ||
|---|---|---|
template< class T, std::size_t N >
struct tuple_size< std::array<T, N> > :
std::integral_constant<std::size_t, N>
{ };
| (since C++11) |
Provides access to the number of elements in an std::array as a compile-time constant expression.
Helper variable template
template< class T > constexpr std::size_t tuple_size_v = tuple_size<T>::value; | (since C++17) |
Inherited from std::integral_constant
Member constants
|
value
[static] |
N, the number of elements in the array (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> |
Example
#include <array>
int main()
{
auto arr = std::to_array("ABBA");
static_assert(std::tuple_size<decltype(arr)>{} == 5);
}
See also
| Structured binding (C++17) | binds the specified names to sub-objects or tuple elements of the initializer |
|
(C++11) | obtains the number of elements of a tuple-like type (class template) |
|
(C++11) | obtains the size of a |
|
(C++11) | obtains the size of a pair (class template specialization) |
|
(C++20) | obtains the size of a std::ranges::subrange (class template specialization) |
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