NAME¶

std::signed_integral - std::signed_integral

Synopsis¶

Defined in header <concepts>
template< class T > (since C++20)
concept signed_integral = std::integral<T> && std::is_signed_v<T>;

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

Notes¶

signed_integral<T> may be satisfied by a type that is not a signed integer type, for
example, char (on a system where char is signed).

Example¶

// Run this code

#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

See also¶

is_integral checks if a type is an integral type
(C++11) (class template)
is_signed checks if a type is a signed arithmetic type
(C++11) (class template)