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std::is_fundamental - cppreference.com

template< class T >
struct is_fundamental;

std::is_fundamental is a UnaryTypeTrait.

If T is a fundamental type (that is, arithmetic type, void, or nullptr_t), provides the member constant value equal true. For any other type, value is false.

If the program adds specializations for std::is_fundamental or std::is_fundamental_v, the behavior is undefined.

template< class T >
constexpr bool is_fundamental_v = is_fundamental<T>::value;

#include <type_traits>
 
static_assert(std::is_fundamental_v<int> == true);
static_assert(std::is_fundamental_v<int&> == false);
static_assert(std::is_fundamental_v<int*> == false);
static_assert(std::is_fundamental_v<void> == true);
static_assert(std::is_fundamental_v<void*> == false);
static_assert(std::is_fundamental_v<float> == true);
static_assert(std::is_fundamental_v<float&> == false);
static_assert(std::is_fundamental_v<float*> == false);
static_assert(std::is_fundamental_v<std::nullptr_t> == true);
static_assert(std::is_fundamental_v<std::is_fundamental<int>> == false);
 
class A {};
static_assert(std::is_fundamental_v<A> == false);
static_assert(std::is_fundamental_v<std::is_fundamental<A>::value_type>);
 
int main() {}

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