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Showing content from https://en.cppreference.com/w/cpp/language/../memory/weak_ptr/../../types/is_unbounded_array.html below:

std::is_unbounded_array - cppreference.com

template< class T > struct is_unbounded_array;

(since C++20)

std::is_unbounded_array is a UnaryTypeTrait.

Checks whether T is an arrays of unknown bound. Provides the member constant value which is equal to true, if T is an array type of unknown bound. Otherwise, value is equal to false.

If the program adds specializations for std::is_unbounded_array or std::is_unbounded_array_v, the behavior is undefined.

[edit] Template parameters [edit] Helper variable template

template< class T > constexpr bool is_unbounded_array_v = is_unbounded_array<T>::value;

(since C++20) Inherited from std::integral_constant Member constants true if T is an array type of unknown bound., false otherwise
(public static member constant) Member functions converts the object to bool, returns value
(public member function) returns value
(public member function) Member types [edit] Possible implementation [edit] Notes [edit] Example

#include <type_traits>
 
class A {};
 
static_assert
(""
    && std::is_unbounded_array_v<A> == false
    && std::is_unbounded_array_v<A[]> == true
    && std::is_unbounded_array_v<A[3]> == false
    && std::is_unbounded_array_v<float> == false
    && std::is_unbounded_array_v<int> == false
    && std::is_unbounded_array_v<int[]> == true
    && std::is_unbounded_array_v<int[3]> == false
);
 
int main() {}

[edit] See also checks if a type is an array type
(class template) [edit] checks if a type is an array type of known bound
(class template) [edit] obtains the size of an array type along a specified dimension
(class template) [edit]

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