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Showing content from https://en.cppreference.com/w/cpp/algorithm/../language/../concepts/unsigned_integral.html below:

std::unsigned_integral - cppreference.com

The concept unsigned_integral<T> is satisfied if and only if T is an integral type and std::is_signed_v<T> is false.

[edit] Notes

unsigned_integral<T> may be satisfied by a type that is not an unsigned integer type, for example, bool.

[edit] Example 
#include <concepts>
#include <iostream>
#include <string_view>
 
void test(std::signed_integral auto x, std::string_view text = "")
{
    std::cout << text << " (" + (text == "") << x << ") is a signed integral\n";
}
 
void test(std::unsigned_integral auto x, std::string_view text = "")
{
    std::cout << text << " (" + (text == "") << x << ") is an unsigned integral\n";
}
 
void test(auto x, std::string_view text = "")
{
    std::cout << text << " (" + (text == "") << x << ") is non-integral\n";
}
 
int main()
{
    test(42);               // signed
    test(0xFULL, "0xFULL"); // unsigned
    test('A');              // platform-dependent
    test(true, "true");     // unsigned
    test(4e-2, "4e-2");     // non-integral (hex-float)
    test("∫∫");             // non-integral
}

Possible output:

(42) is a signed integral
0xFULL (15) is an unsigned integral
(A) is a signed integral
true (1) is an unsigned integral
4e-2 (0.04) is non-integral
(∫∫) is non-integral
[edit] References
[edit] See also checks if a type is an integral type
(class template) [edit] checks if a type is a signed arithmetic type
(class template) [edit]

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