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Showing content from https://cplusplus.com/reference/type_traits/is_signed/ below:

class template

<type_traits>

std::is_signed

template <class T> struct is_signed;

Is signed type

Trait class that identifies whether T is a signed arithmetic type.

It inherits from integral_constant as being either true_type or false_type, depending on whether T is considered signed.

A type, T, is considered signed by this class if it is an arithmetic type (i.e., a fundamental integral or floating point type) and the following is true:

Template parameters

T: A type.

Member types Inherited from integral_constant:

Member constants Inherited from integral_constant:
member constant definition value either true or false
Member functions Inherited from integral_constant:

operator bool: Returns value (public member function)

Example

// is_signed example
#include <iostream>
#include <type_traits>

struct A { };
enum class B : int { x,y,z };

int main() {
  std::cout << std::boolalpha;
  std::cout << "is_signed:" << std::endl;
  std::cout << "int: " << std::is_signed<int>::value << std::endl;
  std::cout << "float: " << std::is_signed<float>::value << std::endl;
  std::cout << "unsigned long: " << std::is_signed<unsigned long>::value << std::endl;
  std::cout << "A: " << std::is_signed<A>::value << std::endl;
  std::cout << "B: " << std::is_signed<B>::value << std::endl;
  return 0;
}

Output:

is_signed:
int: true
float: true
unsigned long: false
A: false
B: false