std::unsigned_integral
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unsigned_integral
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Exposition-only concepts
(C++20)
Defined in header
<concepts>
template< class T >
concept unsigned_integral = std::integral <T> && !std::signed_integral <T>;
(since C++20)
concept unsigned_integral = std::integral <T> && !std::signed_integral <T>;
The concept unsigned_integral<T> is satisfied if and only if T is an integral type and std::is_signed_v <T> is false.
Contents
[edit] Notes
unsigned_integral<T> may be satisfied by a type that is not an unsigned integer type, for example, bool.
[edit] 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
[edit] References
- C++23 standard (ISO/IEC 14882:2024):
- 18.4.7 Arithmetic concepts [concepts.arithmetic]
- C++20 standard (ISO/IEC 14882:2020):
- 18.4.7 Arithmetic concepts [concepts.arithmetic]