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

class template

<type_traits>

std::is_class

template <class T> struct is_class;

Is non-union class

Trait class that identifies whether T is a class type, but not a union type.

It inherits from integral_constant as being either true_type or false_type.

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_class example
#include <iostream>
#include <type_traits>

struct A {};
class B {};
union C {int i; float f;};
enum class D {x,y,z};

int main() {
  std::cout << std::boolalpha;
  std::cout << "is_class:" << std::endl;
  std::cout << "A: " << std::is_class<A>::value << std::endl;
  std::cout << "B: " << std::is_class<B>::value << std::endl;
  std::cout << "C: " << std::is_class<C>::value << std::endl;
  std::cout << "D: " << std::is_class<D>::value << std::endl;
  return 0;
}

Output:

is_class:
A: true
B: true
C: false
D: false