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

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


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).


#include <concepts>
#include <iostream>
void print(std::signed_integral auto i) {
    std::cout << "Signed integral: " << i << '\n';
void print(std::unsigned_integral auto u) {
    std::cout << "Unsigned integral: " << u << '\n';
void print(auto x) {
    std::cout << "Non-integral: " << x << '\n';
int main() {
    print(42);     // signed
    print(0xFull); // unsigned
    print(true);   // unsigned
    print('A');    // platform-dependent
    print(4e-2);   // non-integral (hex-float)
    print("∫∫∫");  // non-integral

Possible output:

Signed integral: 42
Unsigned integral: 15
Unsigned integral: 1
Signed integral: A
Non-integral: 0.04
Non-integral: ∫∫∫

See also

checks if a type is an integral type
(class template)
checks if a type is a signed arithmetic type
(class template)

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