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Showing content from https://cplusplus.com/is_pointer below:

class template

<type_traits>

std::is_pointer

template <class T> struct is_pointer;

Is pointer

Trait class that identifies whether T is a pointer type.

It inherits from integral_constant as being either true_type or false_type.

Pointer to functions are considered pointer types by this class, but pointers to non-static class members and the type of nullptr are not (see is_member_object_pointer and is_member_function_pointer).

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_pointer example
#include <iostream>
#include <type_traits>

int main() {
  std::cout << std::boolalpha;
  std::cout << "is_pointer:" << std::endl;
  std::cout << "int: " << std::is_pointer<int>::value << std::endl;
  std::cout << "int*: " << std::is_pointer<int*>::value << std::endl;
  std::cout << "int**: " << std::is_pointer<int**>::value << std::endl;
  std::cout << "int(*)(int): " << std::is_pointer<int(*)(int)>::value << std::endl;
  return 0;
}

Output:

is_pointer:
int: false
int*: true
int**: true
int(*)(int): true