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

class template

<type_traits>

std::is_integral

template <class T> struct is_integral;

Is integral

Trait class that identifies whether T is an integral type.

It inherits from integral_constant as being either true_type or false_type, depending on whether T is an integral type:

fundamental integral types bool char char16_t char32_t wchar_t signed char short int int long int long long int unsigned char unsigned short int unsigned int unsigned long int unsigned long long int

All fundamental integral types, along with all their aliases (like those in cstdint), are considered integral types by this class, including their const and volatile qualified variants.

Enums are not considered integral types in C++ (see is_enum).

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_integral example
#include <iostream>
#include <type_traits>

int main() {
  std::cout << std::boolalpha;
  std::cout << "is_integral:" << std::endl;
  std::cout << "char: " << std::is_integral<char>::value << std::endl;
  std::cout << "int: " << std::is_integral<int>::value << std::endl;
  std::cout << "float: " << std::is_integral<float>::value << std::endl;
  return 0;
}

Output:

is_integral:
char: true
int: true
float: false