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

class template

<type_traits>

std::remove_pointer

template <class T> struct remove_pointer;

Remove pointer

Obtains the type pointed by T (if T is a pointer).

The transformed type is aliased as member type remove_pointer::type.

If T is a pointer type, this is the type to which it points. Otherwise, it is the same as T, unchanged.

Notice that this class merely obtains a type using another type as model, but it does not transform values or objects between those types.

Template parameters

T: A type.

Member types member type definition type If T is a pointer type, the type pointed by T.
Otherwise, T.
Example

// remove_pointer
#include <iostream>
#include <type_traits>

int main() {
  typedef std::remove_pointer<int>::type A;          // int
  typedef std::remove_pointer<int*>::type B;         // int
  typedef std::remove_pointer<int**>::type C;        // int*
  typedef std::remove_pointer<const int*>::type D;   // const int
  typedef std::remove_pointer<int* const>::type E;   // int

  std::cout << std::boolalpha;
  std::cout << "typedefs of int:" << std::endl;
  std::cout << "A: " << std::is_same<int,A>::value << std::endl;
  std::cout << "B: " << std::is_same<int,B>::value << std::endl;
  std::cout << "C: " << std::is_same<int,C>::value << std::endl;
  std::cout << "D: " << std::is_same<int,D>::value << std::endl;
  std::cout << "E: " << std::is_same<int,E>::value << std::endl;

  return 0;
}

Output:

typedefs of int:
A: true
B: true
C: false
D: false
D: true