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

class template

<type_traits>

std::is_compound

template <class T> struct is_compound;

Is compound type

Trait class that identifies whether T is a compound type.

It inherits from integral_constant as being either true_type or false_type, depending on whether T is a compound type (i.e., not a fundamental type).

This is a compound type trait defined with the same behavior as:

1
2

template<class T>
struct is_compound : std::integral_constant <bool,!is_fundamental<T>::value> {};

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_compound example
#include <iostream>
#include <type_traits>

int main() {
  std::cout << std::boolalpha;
  std::cout << "is_compound:" << std::endl;
  std::cout << "long int: " << std::is_compound<long int>::value << std::endl;
  std::cout << "float: " << std::is_compound<float>::value << std::endl;
  std::cout << "float*: " << std::is_compound<float*>::value << std::endl;
  std::cout << "float&: " << std::is_compound<float&>::value << std::endl;
  std::cout << "decltype(nullptr): " << std::is_compound<decltype(nullptr)>::value << std::endl;
  return 0;
}

Output:

is_compound:
long int: false
float: false
float*: true
float&: true
decltype(nullptr): false