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    std::is_bounded_array

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    Defined in header <type_traits>
    template< class T > struct is_bounded_array;
    		 (since C++20)
    See More

    std::is_bounded_array is a UnaryTypeTrait.

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

    If the program adds specializations for std::is_bounded_array or std::is_bounded_array_v, the behavior is undefined.

    Template parameters

    T - a type to check

    Helper variable template

    template< class T > constexpr bool is_bounded_array_v = is_bounded_array<T>::value;
    		 (since C++20)
    [edit]

    Inherited from std::integral_constant

    Member constants

    value
    [static]
    		 true if T is an array type of known bound, false otherwise
    (public static member constant)

    Member functions

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

    Member types

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

    Possible implementation

    template<class T>
struct is_bounded_array : std::false_type {};

template<class T, std::size_t N>
struct is_bounded_array<T[N]> : std::true_type {};

    Notes

    Feature-test macro Value Std Feature
    __cpp_lib_bounded_array_traits 201902L (C++20) std::is_bounded_array, std::is_unbounded_array

    Example

    Run this code
    #include <iostream>
#include <type_traits>

#define OUT(...) std::cout << #__VA_ARGS__ << " : " << __VA_ARGS__ << '\n'

class A {};

int main()
{
    std::cout << std::boolalpha;
    OUT(std::is_bounded_array_v<A>);
    OUT(std::is_bounded_array_v<A[]>);
    OUT(std::is_bounded_array_v<A[3]>);
    OUT(std::is_bounded_array_v<float>);
    OUT(std::is_bounded_array_v<int>);
    OUT(std::is_bounded_array_v<int[]>);
    OUT(std::is_bounded_array_v<int[3]>);
}

    Output: 

    std::is_bounded_array_v<A> : false
std::is_bounded_array_v<A[]> : false
std::is_bounded_array_v<A[3]> : true
std::is_bounded_array_v<float> : false
std::is_bounded_array_v<int> : false
std::is_bounded_array_v<int[]> : false
std::is_bounded_array_v<int[3]> : true

    See also

    (C++11)
    		 checks if a type is an array type
    (class template) [edit]
    (C++20)
    		 checks if a type is an array type of unknown bound
    (class template) [edit]
    (C++11)
    		 obtains the size of an array type along a specified dimension
    (class template) [edit]