std::signed_integral

 

C++

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Core language concepts same_as derived_from convertible_to common_reference_with      common_with integral signed_integral unsigned_integral floating_point swappableswappable_with destructible constructible_from default_initializable move_constructible copy_constructible assignable_from

Comparison concepts equality_comparableequality_comparable_with totally_orderedtotally_ordered_with Object concepts movable copyable semiregular regular Callable concepts invocableregular_invocable predicate relation equivalence_relation strict_weak_order

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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.

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>
 
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

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