std::remove_pointer(3)

NAME
std::remove_pointer - std::remove_pointer

Synopsis
   Defined in header <type_traits>
   template< class T > (since C++11)
   struct remove_pointer;
   Provides the member typedef type which is the type pointed to by T, or, if T is not
   a pointer, then type is the same as T.
   If the program adds specializations for std::remove_pointer, the behavior is
   undefined.

Member types
   Name Definition
   type the type pointed to by T or T if it's not a pointer

Helper types
   template< class T > (since C++14)
   using remove_pointer_t = typename remove_pointer<T>::type;

Possible implementation
   template<class T> struct remove_pointer { typedef T type; };
   template<class T> struct remove_pointer<T*> { typedef T type; };
   template<class T> struct remove_pointer<T* const> { typedef T type; };
   template<class T> struct remove_pointer<T* volatile> { typedef T type; };
   template<class T> struct remove_pointer<T* const volatile> { typedef T type; };

Example
// Run this code
 #include <type_traits>
 static_assert
 (
     std::is_same_v<int, int> == true &&
     std::is_same_v<int, int*> == false &&
     std::is_same_v<int, int**> == false &&
     std::is_same_v<int, std::remove_pointer_t<int>> == true &&
     std::is_same_v<int, std::remove_pointer_t<int*>> == true &&
     std::is_same_v<int, std::remove_pointer_t<int**>> == false &&
     std::is_same_v<int, std::remove_pointer_t<int* const>> == true &&
     std::is_same_v<int, std::remove_pointer_t<int* volatile>> == true &&
     std::is_same_v<int, std::remove_pointer_t<int* const volatile>> == true
 );
 int main() {}

See also
   is_pointer checks if a type is a pointer type
   (C++11) (class template)
   add_pointer adds a pointer to the given type
   (C++11) (class template)